Search found 265 matches

by leffex
Feb 13 2022 3:37pm
Forum: Battery Technology
Topic: Is the BMS preventing charge?
Replies: 3
Views: 195

Re: Is the BMS preventing charge?

Usually if one cell group is off or out of range. Let's say one groups is at 3,3v and the rest at 4,2v. It will not permit charge or discharge depending on the bms layout or functions. (Putting it in the charger won't equalize this. Maybe it will charge for sometime and then you'd get a 1km out of i...
by leffex
Jan 31 2022 11:44am
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 1548
Views: 243099

Re: kWeld - "Next level" DIY battery spot welder

Hello again I just updated my a123 life battery of 2s2p with another 2s2p of a123 26650 s (to use it instead of my other battery 4s40AH lipo 12C rated 1750A in CAL) From having about 800A of power at the CAL it now outputs between 950-1077A, charged and sitting at 6,58v so not fully charged but stil...
by leffex
Jan 14 2022 7:53am
Forum: Battery Technology
Topic: mixed Pb + Lifepo
Replies: 10
Views: 478

Re: mixed Pb + Lifepo

I know. I know that mixing these into one pack is a bad idea. I do read warnings about it, but I have not found a good explanation. I do want to know the details of what would happen during charge and discharge cycles if I added a 12V SLA to a pack made up of 16 LiFePO4 15Ah cylindrical cells. Than...
by leffex
Dec 31 2021 4:49am
Forum: Battery Technology
Topic: Today work - Reparing citycoco trash transport..
Replies: 3
Views: 333

Re: Today work - Reparing citycoco trash transport..

good job!

Looking forward to see your battery repair.
by leffex
Dec 19 2021 4:30pm
Forum: Battery Technology
Topic: Ebike Battery pack got unbalanced. Reasons?
Replies: 18
Views: 761

Re: Ebike Battery pack got unbalanced. Reasons?

I hate it. I mean I got new packs that has unbalanced cells and if you read one group they can be 3.0v when the rest are sitting at 4.0v. BMS cuts charge at different voltages for a 36v battery; 37,5v. 38,5v 40,5v . Total capacity measured before BMS cuts again at discharge can be from 3,5% to 15% c...
by leffex
Nov 30 2021 4:28am
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 1548
Views: 243099

Re: kWeld - "Next level" DIY battery spot welder

Just got my welder working after having a former battery being used tested at 750-850A that didn't give any welds. I'm now using a battery that gives out 1860A and maybe I can add some cells to get the last Amps as well if I want. Tried some welding and checking nickel holding onto the cells and 50J...
by leffex
Nov 07 2021 3:19am
Forum: Battery Technology
Topic: New Easy Lithium Weldless Box crowdfunding project
Replies: 18
Views: 914

Re: New Easy Lithium Weldless Box crowdfunding project

zzoing wrote:
Oct 31 2021 5:23am
Hi everybody, ...
Hi

Awesome work. You'll be on my awsome list with jehgarcia hbpowerwall. ebike.ca guy and many more

From the looks of it I think it is very promising.
by leffex
May 13 2021 5:46pm
Forum: Battery Technology
Topic: using repackr
Replies: 3
Views: 231

Re: using repackr

You need to input each cells value in mah that you have measured. The results will make your pack with your available cells "as even" as possible as we know groups of cells acts as one. Why use this. If one cell group is 10ah in your 13s pack after you and the rest sits at 11ah. Then the p...
by leffex
May 11 2021 12:16pm
Forum: Battery Technology
Topic: Mixing lipo and lithium ion batteries
Replies: 7
Views: 2047

Re: Mixing lipo and lithium ion batteries

Possible. Yes But they may have different voltage curves and their specific energy may be in different voltages areas. So lipos have energy in the higher voltage range and if you compare them to 18650 li-ions they may have their most energy in a lower area around 3,5-3,8v area What effects does this...
by leffex
Apr 18 2021 11:59am
Forum: EBike Non-hub Motor Drives
Topic: Tsdz2 vlcd5 display showing E06 error, help pls!
Replies: 15
Views: 949

Re: Tsdz2 vlcd5 display showing E06 error, help pls!

Check for loose connections. Have you recently unplugged and plugged back the display cable? (maybe a pin has been pushed to the side meaning the plug is in but the connections inside is not. Real life story. This has happend. Fixed by bending the tiny pin back and pluggs connected again) Error E06 ...
by leffex
Mar 25 2021 10:40am
Forum: Battery Technology
Topic: Suspect and odd voltages Dolphin case battery please join in and help
Replies: 6
Views: 409

Re: Suspect and odd voltages Dolphin case battery please join in and help

So I think I have managed to find out what causes all these odd problems. I have another 10 packs like this to handle and figure out. My assumptions after today are as following: The cells are the culprit. I assume the cells are rewrapped and recycled LG M26 cells which is the worst cell ever create...
by leffex
Mar 25 2021 4:58am
Forum: Battery Technology
Topic: Suspect and odd voltages Dolphin case battery please join in and help
Replies: 6
Views: 409

Re: Suspect and odd voltages Dolphin case battery please join in and help

Here's another Dolphin battery pack with a fault that is easily spotted. Pretty much not the same problem as the first packs in the first post.


48v 14ah measured capacity at 7,5% with one cell group showing imbalance or fault
Image
https://imgur.com/gallery/gHWeGwH
by leffex
Mar 18 2021 12:44pm
Forum: Battery Technology
Topic: Suspect and odd voltages Dolphin case battery please join in and help
Replies: 6
Views: 409

Re: Suspect and odd voltages Dolphin case battery please join in and help

So. Drained and then charged all cells after putting them at the same SOC. Results are however bad as cell groups differs from 4.26v to 4.02v in the fully charged pack Some cell groups thus does carry more capacity than other groups and by a big margin. The 4.02v group has the most capacity and or h...
by leffex
Mar 12 2021 5:01am
Forum: Battery Technology
Topic: Suspect and odd voltages Dolphin case battery please join in and help
Replies: 6
Views: 409

Re: Suspect and odd voltages Dolphin case battery please join in and help

Thanks goatman. Reasons are to find ways to fault search batteriers as fast as possible as well as finding the correct fault as if this takes to much time they are sent to the grave and recycling yard. I've been learning about 18650 and ebikes since 2012 but this still puzzles me why so basic faults...
by leffex
Mar 10 2021 11:45am
Forum: Battery Technology
Topic: Suspect and odd voltages Dolphin case battery please join in and help
Replies: 6
Views: 409

Suspect and odd voltages Dolphin case battery please join in and help

Battery The problem. Unknown. What I suspect is that it has been manufactured in the wrong way at the minus poles as you shouldn't spot weld in the center of them. Can anyone give me any clue to what might be the issue. Any other hypothesises would be appreciated as main reason for this is sharing a...
by leffex
Feb 13 2021 7:54am
Forum: EBike General Discussion
Topic: Upgrading 60v 30A battery to 60v 48A or 52A for Super Soco CU3S
Replies: 12
Views: 660

Re: Upgrading 60v 30A battery to 60v 48A or 52A for Super Soco CU3S

I understand you don't want to buy another battery of 60v 30ah.

Can you build your own battery?

Do you know someone who can or do know a little about electronics?

The easiest solution would be to bring your charger when you ride or get an extra of the same or buy a faster charger.
by leffex
Feb 12 2021 6:23pm
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 1548
Views: 243099

Re: kWeld - "Next level" DIY battery spot welder

It depends on your work piece. 0.1mm nickel doesn't require much current, but 0.3mm nickel much more. kCap is limited to 0.2mm, and for 0.3mm a battery should deliver at least 1400A. I found the answer earlier in the thread. flippy. I will try that. Also setup a different battery for 0.3mm when doi...
by leffex
Feb 12 2021 12:45pm
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 1548
Views: 243099

Re: kWeld - "Next level" DIY battery spot welder

So I installed and set up my kweld with transparent housing. Battery 8.8ah a123 life 6,48v or 3,225v per cell (2s2p setup) (a123, ahr32113 ultra-b orange cells) Undercurrent at first try with CAL. at 740a and then I get about 840A when pressing down harder and about 2,41mOHM to 2,52mOHM. Original ca...
by leffex
Nov 10 2020 8:52pm
Forum: EBike Technical
Topic: Difference on internal Sabvoton boards
Replies: 3
Views: 276

Re: Difference on internal Sabvoton boards

PM Hi how are you? Thanks for reply here https://endless-sphere.com/forums/viewtopic.php?p=1595825#p1595825 I tried what you said but still getting the lack voltage. When i opened up the app there are zeros on all of the power settings. The red light is on and the battery is fully charged. Very stra...
by leffex
Nov 05 2020 7:07pm
Forum: EBike Technical
Topic: Difference on internal Sabvoton boards
Replies: 3
Views: 276

Re: Difference on internal Sabvoton boards

But when I connect a fully charged battery to the 72080 the red light comes on and the connector sparks as usual. But on the mqcon app it says LACK VOLTAGE. LACK VOLTAGE means the battery connected has to low voltage to run the motor. Go into the MQCON app. Change low voltage settings to a lower vo...
by leffex
Jul 30 2020 7:43am
Forum: EScooters/EMotorcycles
Topic: Super Soco TS Upgrade
Replies: 70
Views: 13237

Re: Super Soco TS Upgrade

What's next? Do I need to thtough it all away, measure each individuel cell again? Should I only measure voltage or also resistance (how?). The area affected I think is what received the damage. Let's say a cell on the other side would only "realease" energy at its highest rate and that's...
by leffex
Jul 21 2020 5:12pm
Forum: EScooters/EMotorcycles
Topic: Super Soco TS Upgrade
Replies: 70
Views: 13237

Re: Super Soco TS Upgrade

...You take 95V and 150A from your battery (which is 14.25kW) and you step that down to a lower voltage with higher current, which is what the motor sees. Is the effect / The real world performance that it is 33kw because the phase amps are 350 but the voltage just lower of course or are you saying...
by leffex
Jul 21 2020 5:08pm
Forum: EScooters/EMotorcycles
Topic: Super Soco TS Upgrade
Replies: 70
Views: 13237

Re: Super Soco TS Upgrade

Ahh, 95V that's a lot, I was thinking on 60V. Do you have pictures of that all, sounds like you have a lot of stuff packed onto the frame. And how did you connect the Super Soco connectors to the new controller? I have removed a lot of plastics on the inside which will give you more space. Also the...
by leffex
Jul 20 2020 7:12pm
Forum: Battery Technology
Topic: Most foolproof chemistry for cold weather use?
Replies: 24
Views: 805

Re: Most foolproof chemistry for cold weather use?

LTO or A123 that is a hardcore type of lifepo4 which is by weight and size /2 that of lead acid. If you want A123 32113 cells I have a few if you want for free to pick up in Gothenburg Sweden, 5 minutes walk from train central area. Samsung 29e 32e, LG mh1 mj1 or panasonic pf or ga. is even more cap...