Search found 168 matches

by Headrc
Aug 20 2020 9:36am
Forum: Battery Technology
Topic: Passive BMS packs balance variance at lowest voltage
Replies: 9
Views: 216

Re: Passive BMS packs balance variance at lowest voltage

Yes ...thank you. And I did understand all of this before posting. I was just looking for some confirmation about the imbalance at the full discharge point even though passively top balanced with a BMS in the first place. And I believe I now have confirmation that this is going to happen although I ...
by Headrc
Aug 19 2020 7:29pm
Forum: Battery Technology
Topic: Passive BMS packs balance variance at lowest voltage
Replies: 9
Views: 216

Re: Passive BMS packs balance variance at lowest voltage

I understand that about the shoulders of V vs. SoC. And for my personal packs I go for longevity regarding these points. This discussion is as a result of one I have with someone I built a pack for. He wants to get every ounce of capacity out of that pack and has gone against the recommendation I ha...
by Headrc
Aug 19 2020 1:28pm
Forum: Battery Technology
Topic: Passive BMS packs balance variance at lowest voltage
Replies: 9
Views: 216

Re: Passive BMS packs balance variance at lowest voltage

So with the bottom balancing, the accepted practice then is to not have a passive BMS that then balances at the top end I am assuming? However, once this process is done I am curious for actual stats that folks are experiencing regarding balances at the end of a discharge cycle. Is each series of ce...
by Headrc
Aug 19 2020 10:37am
Forum: Battery Technology
Topic: Passive BMS packs balance variance at lowest voltage
Replies: 9
Views: 216

Passive BMS packs balance variance at lowest voltage

I have a question for those of you who can actually see the balance variance with packs which have passive BMS units such as the Bluetooth Chinese stuff. What is the lowest voltage in a real world experience do you find your pack(s) actually getting discharged to and what do you find the balance of ...
by Headrc
Apr 11 2020 10:56am
Forum: Items for Sale - New
Topic: Boston Power Batteries LOTS OF OPTIONS USA will ship International
Replies: 8
Views: 2292

Re: Boston Power Batteries LOTS OF OPTIONS USA will ship International

Bumping this up here ...I still have a good quantity of the Boston Power batteries for those who might be interested. Shoot me a PM and let me answer your battery needs. Thanks, Richard
by Headrc
Jan 07 2020 9:03pm
Forum: Items for Sale - New
Topic: Boston Power Batteries LOTS OF OPTIONS USA will ship International
Replies: 8
Views: 2292

Re: Best 18650 cell for 3s 18A max

Have you considered the Boston Power Swing batteries? They will surprise you for performance vs. cost. If interested check the posts in here on these batteries ...and yes I can supply them. But that is not the only reason I suggest them ...it is because they are a very good battery.
by Headrc
Dec 11 2019 10:53am
Forum: Battery Technology
Topic: Upcycled used LiIon Battery - NICKS
Replies: 4
Views: 833

Re: Upcycled used LiIon Battery - NICKS

If you don't want to pull the pack apart and put new shrink wrap on the cells....then you could possibly use Kapton tape on the damaged wrap.
by Headrc
Dec 08 2019 2:39pm
Forum: Resources & EV Related Parts and Services
Topic: New or Rebuilt Lithium-Ion Battery Service
Replies: 41
Views: 5892

Re: New or Rebuilt Lithium-Ion Battery Service

If he is shipping USPS priority ...I would bet the batteries are not labeled properly. USPS has now become very particular on the shipping of Lithium batteries, even if packaged properly and labeled properly. My local USPS will now refuse any Lithium battery shipment over 5 lbs. I do all my shipping...
by Headrc
Dec 03 2019 10:01am
Forum: Battery Technology
Topic: Boston-Power Swing 5300 Li-ion cell test
Replies: 129
Views: 22821

Re: Boston-Power Swing 5300 Li-ion cell test

The medical packs that I am familiar with are all Boston Power Sonata cells ...which have a lower discharge rate. If you read the marketing statement at the top of the Boston Power Swing 5300, you will see what they state the Swing is applicable to.

http://liionbms.com/pdf/bostonpower/swing5300.pdf
by Headrc
Dec 02 2019 9:07pm
Forum: Battery Technology
Topic: Boston-Power Swing 5300 Li-ion cell test
Replies: 129
Views: 22821

Re: Boston-Power Swing 5300 Li-ion cell test

Actually as I understand it ...BP Swing Cells were actually marketed to the auto industry. And those that I am familiar with using them for Ebikes have been happy and impressed with them.
by Headrc
Dec 02 2019 10:46am
Forum: Battery Technology
Topic: Where can I buy very large heat shrink tubing?
Replies: 5
Views: 1311

Re: Where can I buy very large heat shrink tubing?

Contact Keith with 18650shrink ..... off Ebay at 18650shrink@gmail.com . He has good pricing, gives great service and you will get it faster.
by Headrc
Dec 01 2019 9:30pm
Forum: Battery Technology
Topic: Boston-Power Swing 5300 Li-ion cell test
Replies: 129
Views: 22821

Re: Boston-Power Swing 5300 Li-ion cell test

I do not have any specific temp data ...all I have are folks who have used these for Ebikes and Scooters ...and no complaints about heating up or sag as long as the packs are built properly for the amount of current needed.
by Headrc
Dec 01 2019 2:23pm
Forum: Battery Technology
Topic: Boston-Power Swing 5300 Li-ion cell test
Replies: 129
Views: 22821

Re: Boston-Power Swing 5300 Li-ion cell test

According to the BP Swing 5300 spec sheet ....2C is maximum continuous discharge rate.

http://liionbms.com/pdf/bostonpower/swing5300.pdf
by Headrc
Oct 14 2019 9:10am
Forum: Battery Technology
Topic: Shipping batteries, or cheap alternative for benchtop testing?
Replies: 14
Views: 1062

Re: Shipping batteries, or cheap alternative for benchtop testing?

Where are you located? And what is the capacity of the battery you are looking for? Richard
by Headrc
Oct 05 2019 12:28pm
Forum: Resources & EV Related Parts and Services
Topic: E-bike battery rebuilder - highly recommended
Replies: 1
Views: 819

Re: E-bike battery rebuilder - highly recommended

Thanks for those kind words Steve, I am glad we could get this working for you. Richard
by Headrc
Sep 29 2019 8:56am
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 1220
Views: 181817

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

Always very well documented and challenging input Electricgod! Doing your best to live up to that name ...thanks...
by Headrc
Sep 23 2019 8:54am
Forum: E-Bike Technical
Topic: XLD Brainpower motor controller XunLiDa
Replies: 133
Views: 61534

Re: XLD Brainpower motor controller XunLiDa

Now looking at another throttle replacement brings a question ....does that lock/ignition wire get rid of the need for a battery cutoff switch if you have a throttle with an on/off switch? Meaning, instead of wiring the lock/ignition wire to positive, you wire it to the throttle's on/off wire and no...
by Headrc
Sep 22 2019 9:01pm
Forum: E-Bike Technical
Topic: XLD Brainpower motor controller XunLiDa
Replies: 133
Views: 61534

Re: XLD Brainpower motor controller XunLiDa

I found my problem ....it is the Chinese speed controller after all. One of leads on the diodes in the controller actually had a hairline crack on it ...I had to use a magnifying glass to see it. I put a 250k pot in place of the controller ...and while not optimum I could at least control the speed ...
by Headrc
Sep 22 2019 6:03pm
Forum: E-Bike Technical
Topic: XLD Brainpower motor controller XunLiDa
Replies: 133
Views: 61534

Re: XLD Brainpower motor controller XunLiDa

I am trying to wire up one of these motor controllers up too. I followed all the info here and the good news is the motor is running and running in the right direction. The bad news is the accelerator does not work at all, the motor just runs full on all the time. Checking the Chinese hand accelerat...
by Headrc
Sep 20 2019 7:49pm
Forum: Battery Technology
Topic: Adding a Key to battery pack ?
Replies: 15
Views: 1093

Re: Adding a Key to battery pack ?

I just purchased one of these and tested it under load today:

https://www.amazon.com/gp/product/B07MT ... UTF8&psc=1

All went well under load....so obviously the Flisky was not up to the task and did not meet its specifications.
by Headrc
Sep 20 2019 1:20pm
Forum: Battery Technology
Topic: Adding a Key to battery pack ?
Replies: 15
Views: 1093

Re: Adding a Key to battery pack ?

No sign of contacts burning ...and since the electronics are enclosed with black heat shrink I cannot see if there is visible evidence of a failed component. Obviously the switch is now closed, permanently passing voltage from the battery. And of course I am trying to get a response from the seller ...
by Headrc
Sep 19 2019 8:40pm
Forum: Battery Technology
Topic: Adding a Key to battery pack ?
Replies: 15
Views: 1093

Re: Adding a Key to battery pack ?

I mentioned it wrong ...it is a Flipsky switch ...similar to the Luna switch. Here is a link to one: https://www.amazon.com/Cigooxm-Flipsky-Electric-Skateboard-Scooter/dp/B07V5Y6NZ2 I wired it up yesterday and tested it just for battery on/off for a 7S battery and it worked fine. But as soon as I pu...
by Headrc
Sep 19 2019 9:40am
Forum: Battery Technology
Topic: Adding a Key to battery pack ?
Replies: 15
Views: 1093

Re: Adding a Key to battery pack ?

Tommycat ....are you actually using the Lunacycle remote switch? And all is well with it? I just tried one of the Flippy switches like this and it failed under load immediately after switching a 7S pack on.
by Headrc
Sep 19 2019 9:26am
Forum: Battery Technology
Topic: Boston-Power Swing 5300 Li-ion cell test
Replies: 129
Views: 22821

Re: Boston-Power Swing 5300 Li-ion cell test

Do you have a link for that vendor? Thanks!
by Headrc
Sep 18 2019 9:00am
Forum: Battery Technology
Topic: Boston-Power Swing 5300 Li-ion cell test
Replies: 129
Views: 22821

Re: Boston-Power Swing 5300 Li-ion cell test

Excellent install there ....where did you get those BP holders? And another actual user comment on these batteries ...thanks!