DIY cheap charger from balance wires

[Jeremy Harris]

No one answered this question for him.

http://endless-sphere.com/forums/viewtopic.php?f=14&t=42159&p=617748&hilit=laptop+power+supply#p617163

You're right. Sometimes there are things that get missed, but that thread's a couple of weeks old now.

Back on this thread topic, I've been digging around and found that the Imax labelled version is identical, except for different sticky labels on the case: http://www.rchelicopterselect.com/i-max-rc-b3-pro-balance-chargers.html

I strongly suspect that these are re-worked units from Imax that are being sold cheaply with another label stuck on the case. Not sure what the implications are in terms of long term reliability, but based on the very small sample of one I'd say that there's no reason for this unit to now be any less reliable than the genuine Imax badged unit that costs several times the price.

The first switch mode supply transformer markings look to be covered by the insulation that's been added around the double E ferrite core. It does seem to have separate primary and secondary bobbins, with good isolation between the terminations, so I'd suggest that the chance of a primary/secondary short is negligible. It's also been varnish impregnated, as there are clear signs of varnish around the edges of the tape. I'd expect this if it really is an Imax part, as the same charger with their badge on it is being sold here by reputable companies, and the law here for selling unsafe, or unapproved, electrical goods is pretty draconian.

So does 9v +18v=36v ?

Sorry? Why ask a question like that in this thread? How's a bit of simple (and wrong) arithmetic related to the discussion in hand?

Getting back on topic, it looks like it's only the front label that's been changed, the rear label seems identical to the Imax B3 shown here:

You showed him this ?

http://endless-sphere.com/forums/download/file.php?id=90229

If I've made an error there, please point it out and I'll correct it. I did check it carefully, but may have made a mistake, as it seems you're implying.

 

[etriker]

The link I showed shows that the poster is a newbee's newbee.

18+9 does not equal 36.

That was not a simple setup you showed and the Imax chargers I have owned tend to let the magic smoke out.

 

[Jeremy Harris]

The link I showed shows that the poster is a newbee's newbee.

Understood, which is why I wrote some guidance on correctly identifying the connections, and gave warnings (in two earlier replies) of the risks of getting it wrong. I'm not cwah's keeper, though, if he wants to have a go at wiring this up and feels confident about doing it then that's his decision, not mine.

18+9 does not equal 36.

Obviously, but I'm afraid I'm still missing the point. How is this random bit of wrong arithmetic linked to this thread and these chargers?

That was not a simple setup you showed and the Imax chargers I have owned tend to let the magic smoke out.

Agreed, which is why I spent half an hour this morning drawing a specific wiring diagram for cwah's application. Not much more I can do via this forum, TBH, is there?

I've no experience of Imax chargers like this, but have read a few reviews that reckon the more complex and higher power B6 is prone to failure. Not sure how that relates to this charger, as from what I can see it seems to be reasonably well made. It's certainly a lot better made than the bigger HK chargers I have, which are gradually failing, one by one, mainly because they run so darned hot.

 

[Tom L]

Thanks Jeremy, a very succinct and thorough investigation.

 

[jana]

I have wired together two very similar chargers to charge a 6_cell lipo. I was the older version with external power supplies.
It worked just fine, but I have not used it again for a couple of reasons. Low charge rate and not being able to set a lower voltage than 4.2x V. If it was easy to hack them to give 4.15 V they would IMHO be more interesting.
Good luck with your project.

 

[etriker]

I have wired together two very similar chargers to charge a 6_cell lipo. I was the older version with external power supplies.
It worked just fine, but I have not used it again for a couple of reasons. Low charge rate and not being able to set a lower voltage than 4.2x V. If it was easy to hack them to give 4.15 V they would IMHO be more interesting.
Good luck with your project.

It would take that setup at least 10 hours to charge my batteries instead of 45 mins with the hyperion ?

I sit with it and listen to a record while charging.

10 hours waiting on a charge ?

I never leave my chargers alone charging.

Don't get it at all.

Sure don't get the safe and simple.

 

[dumbass]

I too have been using single sell chargers (on lifepo4) for a few years and they are working fine. But mine are 2a each so I'm not taking all day to charge. And I hitthe pack with a bulk charger to speed it up. I would recomment you add a CellLog8 to monitor things for you. To me this is a cheap safety margin to protect your investment.

Bob

 

[Jeremy Harris]

It would take that setup about 10 hours to charge my batteries instead of 45 mins with the hyperion.

I sit with it and listen to a record while charging.

10 hours waiting on a charge ?

I never leave my chargers alone charging.

Don't get it at all.

Sure don't get the safe and simple.

Your extreme criticism of this approach has been noted, probably doesn't need endlessly repeating............ :wink:

It's not a solution for everyone, a point made several times already on the thread I originally posted about a similar charger I built a fair while ago (and which is still going fine).

It works very well as a simple to use (note that distinction) charger, the one I originally built is used by a lady in her late 70's, who simply couldn't cope with setting up an RC type charger each time. In her case the bike is charged outside, under a lean-to shelter, with minimal fire risk. It takes around 6 to 8 hours to charge her battery usually, less if she's only used it for a short trip to the shops and back. She doesn't find it at all inconvenient, just plug in one multipole connector and turn on the mains, then wait for all the lights to change colour.

In my case I want a charger than can charge a small pack (12S x 5Ah) without needing to undo a box and rearrange wires. I've fitted a 25 way D type on the box, with 13 of the sockets going to the cell taps. I'm going to build four of these chargers into a box, with a small fan to help cool them (something I found the other similar system I built needed) and a multicore cable going to a mating D type connector. I have no problem with a five or six hour charge time, and will gladly put up with that for the convenience of a simple to use charging solution.

No one is advocating this as the ultimate, best or even a particularly great charging solution, but it certainly will meet the needs of some folk. As for safety, well, I can't see that it's intrinsically any less safe than any other solution. If well assembled, with decent connectors, it's arguably safer than some, as there seem to be a fair few mis-connection related incidents reported here.

 

[dnmun]

they are hackable to get the voltage down to 4.12V.

the outputs have 3 shunt resistors so they act as a small 3S BMS and there are some little shunt transistors next to them and the resistor divider bridge i think is in those surface mount resistors between the shunts and the microprocessor.

it should be an easy hack. you wanna reduce the voltage 2% so you would just solder another surface mount resistor on top of one of the resistors in the bridge to drop the equivalent resistance 2%.

i could not find a pdf for the pwm IC current controller but it has the power mosfet built in and the sense resistor is right next to it there standing up on end. if the charger runs hot and you wanted to make it cooler you could just swap out the sense resistor with a larger value. the rectifier is just the surface mount diodes that are reflowed onto the traces in the front end. low current, low profile.

i like the fact that they actually print the passive component value right on the pcb so when it burns up, you know what to replace it with.

i would want to see a few more of these opened up and pictures of that surface mount transistor jeremy said was worked on to know if it is just this charger or if they had to modify all of them after reflow. it may be that they had to change the led so they had to use another transistor. i don't think that raises the risk of failure. jmho.

 

[etriker]

It would take that setup about 10 hours to charge my batteries instead of 45 mins with the hyperion.

I sit with it and listen to a record while charging.

10 hours waiting on a charge ?

I never leave my chargers alone charging.

Don't get it at all.

Sure don't get the safe and simple.

Your extreme criticism of this approach has been noted, probably doesn't need endlessly repeating............ :wink:

It's not a solution for everyone, a point made several times already on the thread I originally posted about a similar charger I built a fair while ago (and which is still going fine).

It works very well as a simple to use (note that distinction) charger, the one I originally built is used by a lady in her late 70's, who simply couldn't cope with setting up an RC type charger each time. In her case the bike is charged outside, under a lean-to shelter, with minimal fire risk. It takes around 6 to 8 hours to charge her battery usually, less if she's only used it for a short trip to the shops and back. She doesn't find it at all inconvenient, just plug in one multipole connector and turn on the mains, then wait for all the lights to change colour.

In my case I want a charger than can charge a small pack (12S x 5Ah) without needing to undo a box and rearrange wires. I've fitted a 25 way D type on the box, with 13 of the sockets going to the cell taps. I'm going to build four of these chargers into a box, with a small fan to help cool them (something I found the other similar system I built needed) and a multicore cable going to a mating D type connector. I have no problem with a five or six hour charge time, and will gladly put up with that for the convenience of a simple to use charging solution.

No one is advocating this as the ultimate, best or even a particularly great charging solution, but it certainly will meet the needs of some folk. As for safety, well, I can't see that it's intrinsically any less safe than any other solution. If well assembled, with decent connectors, it's arguably safer than some, as there seem to be a fair few mis-connection related incidents reported here.

A 70 year old lady sits and watches it charge for 8 hours ? No way.

Do you stay with your batteries while they charge ?

The more I learn about li ion batteries and charging the more I believe I should stay with them while they charge.

Inside, outside, whatever.

http://endless-sphere.com/forums/viewtopic.php?f=14&t=41877&hilit=headway+fire

 

[Jeremy Harris]

they are hackable to get the voltage down to 4.12V.

the outputs have 3 shunt resistors so they act as a small 3S BMS and there are some little shunt transistors next to them and the resistor divider bridge i think is in those surface mount resistors between the shunts and the microprocessor.

it should be an easy hack. you wanna reduce the voltage 2% so you would just solder another surface mount resistor on top of one of the resistors in the bridge to drop the equivalent resistance 2%.

i could not find a pdf for the pwm IC current controller but it has the power mosfet built in and the sense resistor is right next to it there standing up on end. if the charger runs hot and you wanted to make it cooler you could just swap out the sense resistor with a larger value. the rectifier is just the surface mount diodes that are reflowed onto the traces in the front end. low current, low profile.

i like the fact that they actually print the passive component value right on the pcb so when it burns up, you know what to replace it with.

i would want to see a few more of these opened up and pictures of that surface mount transistor jeremy said was worked on to know if it is just this charger or if they had to modify all of them after reflow. it may be that they had to change the led so they had to use another transistor. i don't think that raises the risk of failure. jmho.

Thanks for that, that's very useful to know. WRT more photos, your wish is my command; I've just opened another one up and tried to take some pictures. It looks like the same transistor has been reworked, as it's at a slight angle and doesn't quite line up with the pads that well. There's also signs of hand rework to one of the chip caps in the centre.

 

[Jeremy Harris]

A 70 year old lady sits and watches it charge for 8 hours ? No way.

Do you stay with your batteries while they charge ?

The more I learn about li ion batteries and charging the more I believe I should stay with them while they charge.

Inside, outside, whatever.

You've made your point, you don't like this, you don't want to do it. No one here is even so much as suggesting you do it. You may not want to believe that others are content with this approach, I may not want to believe that some folk are content to drive big cars at speed. Thankfully we're all free to choose what we want to do.

 

[etriker]

A 70 year old lady sits and watches it charge for 8 hours ? No way.

Do you stay with your batteries while they charge ?

The more I learn about li ion batteries and charging the more I believe I should stay with them while they charge.

Inside, outside, whatever.

You've made your point, you don't like this, you don't want to do it. No one here is even so much as suggesting you do it. You may not want to believe that others are content with this approach, I may not want to believe that some folk are content to drive big cars at speed. Thankfully we're all free to choose what we want to do.

For real, do you stay with li ion when charging ? That is the best ebike li iion charging safety tip I could give.

http://www.hobbyking.com/hobbyking/forum/forum_posts.asp?TID=27587&PN=1

quote from hobby king forum:

My first LiPo explosion was also with the use of the 2/3cells chargers, charging at 800mah. For unkonwn reason, it failed and ignited the lipo big time! Like an inverted rocket going off! Since then, Ive always been extra cautious about those 2/3cells chargers.

It was a 1200mah 3S lipo pack and both the pack and charger were completely destoryed, no surviving cells or functioning charger there. I have a faint memory of there might also be an error while attempting to start charging. And everything went demonic after about 20mins through the charge process. Still a bloody mystery to me.

 

[Jeremy Harris]

For real, do you stay with li ion when charging ? That is the best ebike li iion charging safety tip I could give.

http://www.hobbyking.com/hobbyking/forum/forum_posts.asp?TID=27587&PN=1

Pretty irrelevant to this topic, yet again, but FWIW if charging near the house (sometimes I lean the bike near the back door to charge it) then yes, I do tend to stick around. If charging out in the car port (pretty much just concrete and brick) then often I'll just leave it and get on with something else. I never, ever, charge overnight, ever since this incident: http://endless-sphere.com/forums/viewtopic.php?f=14&t=3241&p=47328#p47328 from four years ago.

Each of us has to make our own decisions about safety, and decide what risks we'll take and what risks we won't. There are many far more dangerous things in life than charging batteries.

My own experience is that LiPo has been safer when abused than my old NiMH pack, but I guess we're all different.

 

[etriker]

Cheap 2/3 cell chargers that started fires when left alone is on topic I would think.

You have led cwah to believe they are super safe ?

I am thinking the cheaper the charger the closer one should keep an eye on it while charging.

8 hours is long enough for me to forget I even plugged them in.

70 year old lady ?

You ever heard of senior moments ?

For real, do you stay with li ion when charging ? That is the best ebike li iion charging safety tip I could give.

http://www.hobbyking.com/hobbyking/forum/forum_posts.asp?TID=27587&PN=1

Pretty irrelevant to this topic, yet again, but FWIW if charging near the house (sometimes I lean the bike near the back door to charge it) then yes, I do tend to stick around. If charging out in the car port (pretty much just concrete and brick) then often I'll just leave it and get on with something else. I never, ever, charge overnight, ever since this incident: http://endless-sphere.com/forums/viewtopic.php?f=14&t=3241&p=47328#p47328 from four years ago.

Each of us has to make our own decisions about safety, and decide what risks we'll take and what risks we won't. There are many far more dangerous things in life than charging batteries.

My own experience is that LiPo has been safer when abused than my old NiMH pack, but I guess we're all different.

 

[Jeremy Harris]

Cheap 2/3 cell chargers that started fires when left alone is on topic I would think.

8 hours is long enough for me to forget I even plugged them in.

70 year old lady ?

You ever heard of senior moments ?

Actually she's nearly 78. The proof is in the pudding, as they say. It's been working very reliably for 18 months or more, given her mobility she didn't have before (she can't drive), is pretty safe as it's charged outside in a fire resistant location, and the charger in question isn't made up from these units, it's one I made and described in another thread, that has separate, current and voltage limited supplies to each cell.

She has had the risks explained, and the charger is run from an 8 hour time switch, so turns off after that if she forgets it. AFAIK this hasn't happened yet, as her journeys tend to be short and hence not much battery capacity gets used between charges.

As I keep saying, it's all about what suits each individual. For her circumstances this is the best option. It's no more hazardous that her leaving her laptop LiPos on charge 24/7 (which I'm reasonably sure happens), or leaving her mobile 'phone LiPo on charge all day, or even leaving her Kindle LiPo on charge all the time.

 

[etriker]

Cheap 2/3 cell chargers that started fires when left alone is on topic I would think.

8 hours is long enough for me to forget I even plugged them in.

70 year old lady ?

You ever heard of senior moments ?

Actually she's nearly 78. The proof is in the pudding, as they say. It's been working very reliably for 18 months or more, given her mobility she didn't have before (she can't drive), is pretty safe as it's charged outside in a fire resistant location, and the charger in question isn't made up from these units, it's one I made and described in another thread, that has separate, current and voltage limited supplies to each cell.

She has had the risks explained, and the charger is run from an 8 hour time switch, so turns off after that if she forgets it. AFAIK this hasn't happened yet, as her journeys tend to be short and hence not much battery capacity gets used between charges.

As I keep saying, it's all about what suits each individual. For her circumstances this is the best option. It's no more hazardous that her leaving her laptop LiPos on charge 24/7 (which I'm reasonably sure happens), or leaving her mobile 'phone LiPo on charge all day, or even leaving her Kindle LiPo on charge all the time.

A 78 year old person that can not cope with pushing a few buttons on a lipo charger should not be charging lipo at all.

They made them so you would have to go through a series of steps to start charging for safety reasons.

Stuff like 11 cells, are you sure ? Then you press the button to go on.

If she can use a laptop then surely she can set up a lipo charger to charge.

Those cheap 2/3 cell chargers in the first post were made to charge small lipo packs. They were not made to run 10 hours at a time ? Small lipo packs do not make large fires like large lipo packs do.

 

[Jeremy Harris]

A 78 year old person that can not cope with pushing a few buttons on a lipo charger should not be charging lipo at all.

They made them so you would have to go through a series of steps to start charging for safety reasons.

Stuff like 11 cells, are you sure ? Then you press the button to go on.

If she can use a laptop then surely she can set up a lipo charger to charge.

Do you REALLY think that I didn't think this through before coming up with this solution?

FWIW she's near-vision visually impaired (not that I should need to explain myself to you), which is why she can't drive (she can see out the windscreen fine, but can't see anything on the dash). She can only use a laptop and KIndle with the screens set to large, high contrast text (which means big, black on white text, no colour). We got her the Kindle because she can't read books or newspapers. There's no way on this planet she'd be able to read the crappy LCD screens on typical LiPo chargers, she can't even read the big screen on her 'phone for chrisake.

Had we had the money we could have bought a ready made ebike. Would charging the LiPo battery in that be safer? No, of course it wouldn't. Pretty much every ready built ebike sold here has a LiPo battery. Most are Chinese in origin. Many are probably no better built than my charger.

WTF is wrong with letting people make their own decisions about what they do and what risks they accept?

 

[etriker]

A 78 year old person that can not cope with pushing a few buttons on a lipo charger should not be charging lipo at all.

They made them so you would have to go through a series of steps to start charging for safety reasons.

Stuff like 11 cells, are you sure ? Then you press the button to go on.

If she can use a laptop then surely she can set up a lipo charger to charge.

Do you REALLY think that I didn't think this through before coming up with this solution?

FWIW she's near-vision visually impaired (not that I should need to explain myself to you), which is why she can't drive (she can see out the windscreen fine, but can't see anything on the dash). She can only use a laptop and KIndle with the screens set to large, high contrast text (which means big, black on white text, no colour). We got her the Kindle because she can't read books or newspapers. There's no way on this planet she'd be able to read the crappy LCD screens on typical LiPo chargers, she can't even read the big screen on her 'phone for chrisake.

Had we had the money we could have bought a ready made ebike. Would charging the LiPo battery in that be safer? No, of course it wouldn't. Pretty much every ready built ebike sold here has a LiPo battery. Most are Chinese in origin. Many are probably no better built than my charger.

WTF is wrong with letting people make their own decisions about what they do and what risks they accept?

Nothing I guess.

What is wrong in thinking cheap chargers are not super safe and not safer than not so cheap chargers ?

I read this forum a lot and it seems that a lot of people are just trying to get the cheapest price on stuff.

The cheapest charger is the best and now it is super safe too ?

It was the super safe comment in the first post that got me going.

And you jumped in like right on bro, I bought them too ?

He claimed he got that idea from this forum. From you ?

I want our forum to be better than that and not let people with little battery knowledge get ideas like cheap b3 chargers are super safe.

No lipo charger is super safe. You need to watch them all. I know, I watch them a lot.

 

[Jeremy Harris]

Nothing I guess.

What is wrong in thinking cheap chargers are not super safe and not safer than not so cheap chargers ?

I read this forum a lot and it seems that a lot of people are just trying to get the cheapest price on stuff.

The cheapest charger is the best and now it is super safe too ?

It was the super safe comment in the first post that got me going.

And you jumped in like right on bro, I bought them too ?

He claimed he got that idea from this forum. From you ?

I want our forum to be better than that and not let people with little battery knowledge get ideas like cheap b3 chargers are super safe.

No lipo charger is super safe. You need to watch them all. I know, I watch them a lot.

At no time have I ever claimed anything was "super safe". At no time have I ever claimed this particular charging solution is "super safe". I've repeatedly stressed the hazards associated with charging, in threads all over this forum for the past four years or more. I've occasionally highlighted this by reference to the battery fire I experienced when charging back in 2008.

I get amused by all the pratts who preach LiPo safety, but still carry LiPo filled cell phones, cameras, iPads and the like in their pockets, leave their LiPo filled laptops on charge overnight, don't think twice about plugging some cheap and nasty Chinese made charger into their home or car to charge up their LiPo filled gizmo. The bottom line is that LiPo batteries can be dangerous, but frankly the risks of them going up in smoke aren't that high if you treat them with care and respect.

If you want a really nasty view of LiPo charging, then take a look at some of the millions of cheap LiPo chargers out there that are sold for charging stuff like camera and 'phone LiPo batteries. Having taken one of these apart last week (a Chinese clone charger for a Panasonic Lumix TZ20) I can say for sure that some of these really do look like a fireball waiting to happen, yet strangely enough they don't often seem to be the cause of fires.

 

[cal3thousand]

A 78 year old person that can not cope with pushing a few buttons on a lipo charger should not be charging lipo at all.

They made them so you would have to go through a series of steps to start charging for safety reasons.

Stuff like 11 cells, are you sure ? Then you press the button to go on.

If she can use a laptop then surely she can set up a lipo charger to charge.

Do you REALLY think that I didn't think this through before coming up with this solution?

FWIW she's near-vision visually impaired (not that I should need to explain myself to you), which is why she can't drive (she can see out the windscreen fine, but can't see anything on the dash). She can only use a laptop and KIndle with the screens set to large, high contrast text (which means big, black on white text, no colour). We got her the Kindle because she can't read books or newspapers. There's no way on this planet she'd be able to read the crappy LCD screens on typical LiPo chargers, she can't even read the big screen on her 'phone for chrisake.

Had we had the money we could have bought a ready made ebike. Would charging the LiPo battery in that be safer? No, of course it wouldn't. Pretty much every ready built ebike sold here has a LiPo battery. Most are Chinese in origin. Many are probably no better built than my charger.

WTF is wrong with letting people make their own decisions about what they do and what risks they accept?

Nothing I guess.

What is wrong in thinking cheap chargers are not super safe and not safer than not so cheap chargers ?

I read this forum a lot and it seems that a lot of people are just trying to get the cheapest price on stuff.

The cheapest charger is the best and now it is super safe too ?

It was the super safe comment in the first post that got me going.

And you jumped in like right on bro, I bought them too ?

He claimed he got that idea from this forum. From you ?

I want our forum to be better than that and not let people with little battery knowledge get ideas like cheap b3 chargers are super safe.

No lipo charger is super safe. You need to watch them all. I know, I watch them a lot.

Everyone here wants to get more for paying less. And price does not necessarily equate to safety in all cases.

Being smart and understanding the underlying principles while mitigating the inherent risks through well planned measures equates to safety.

 

[etriker]

Nothing I guess.

What is wrong in thinking cheap chargers are not super safe and not safer than not so cheap chargers ?

I read this forum a lot and it seems that a lot of people are just trying to get the cheapest price on stuff.

The cheapest charger is the best and now it is super safe too ?

It was the super safe comment in the first post that got me going.

And you jumped in like right on bro, I bought them too ?

He claimed he got that idea from this forum. From you ?

I want our forum to be better than that and not let people with little battery knowledge get ideas like cheap b3 chargers are super safe.

No lipo charger is super safe. You need to watch them all. I know, I watch them a lot.

At no time have I ever claimed anything was "super safe". At no time have I ever claimed this particular charging solution is "super safe". I've repeatedly stressed the hazards associated with charging, in threads all over this forum for the past four years or more. I've occasionally highlighted this by reference to the battery fire I experienced when charging back in 2008.

I get amused by all the pratts who preach LiPo safety, but still carry LiPo filled cell phones, cameras, iPads and the like in their pockets, leave their LiPo filled laptops on charge overnight, don't think twice about plugging some cheap and nasty Chinese made charger into their home or car to charge up their LiPo filled gizmo. The bottom line is that LiPo batteries can be dangerous, but frankly the risks of them going up in smoke aren't that high if you treat them with care and respect.

If you want a really nasty view of LiPo charging, then take a look at some of the millions of cheap LiPo chargers out there that are sold for charging stuff like camera and 'phone LiPo batteries. Having taken one of these apart last week (a Chinese clone charger for a Panasonic Lumix TZ20) I can say for sure that some of these really do look like a fireball waiting to happen, yet strangely enough they don't often seem to be the cause of fires.

He sure did not get the idea they are super safe from me !

You are his guru

 

[Jeremy Harris]

He sure did not get the idea they are super safe from me !

You are his guru

If that's a thinly veiled accusation aimed at me, then you, my friend, are going to be one of only two people in all the years I've been on this forum, that get the privilege of going on my foe list......

 

[cwah]

Etriker, I agree there are risk in doing that. And I think most members here know there are risk in doing that. In this forum, most member take more risk than other by cycling at indecent speed.

But what we need here isn't someone that said that we shouldn't do it because there is risk, but to propose solutions or alternative solutions to our ebike problem and community.

Yes I recognize it's not the best solution, but rather than trying to stop everything, why don't you help at finding better way to make it safer?

One thing is sure: It is inherently safer than bulk charging. So it's already a step forward for our ebike custom solutions



--------------------------------------------------------



Jeremy, really thanks for taking time drawing this. I wouldn't be able to do that by myself.

I tried to add some colours on your drawing to help myself understanding the wiring:

There is the full red stroke which is the red from the battery wire, and the dotted red which is where the red goes to the charger:

Is it good like this? Your drawing is super clear so I think I get it right. Thanks


Also, I've just ordered a set of 3s extension to connect to the charger, but now I'm thinking to completely discard the 3s plug. I'm thinking about removing the 3s plug and directly solder wires to it. Actually, I'd completely remove the charger plastic case and put everything into a bigger plastic case. Good idea?

 

[etriker]

He sure did not get the idea they are super safe from me !

You are his guru

If that's a thinly veiled accusation aimed at me, then you, my friend, are going to be one of only two people in all the years I've been on this forum, that get the privilege of going on my foe list......

Ask him, where did he get the idea they are super safe ?

You may not have come out and said it but from reading other posts of yours I think it was you who led him to believe that.

I looks like your user name is in the guru color ?

It would be wrong not to tell him that his setup is not super safe.

And online foes and friends ? Are you 16 ?