Recent content by kalpatarutree

Any idea as to where to find "dead" Vpower packs Dnmun? Im sure they are out there... I almost was getting ready to let go of mine because I was afraid of taking it apart... Im sure there are loads of people who don't want to get into ebike maitenance/repair that have "dead" scooter / ebike...

I measured at cell level - 3 rows are completely dead at 0 volts. tried charging them as dogman suggested, and they wont hold a charge, understandably. Dead cells were ripped out like you describe, dnmun, by cutting the tabs with scissors. Its all good, i've got a 36v battery and a knowledge...

The blue cells mixed in a def. a mystery, but they have a slightly bigger Amp hour rating. Each cell row was 18 at 1 ah each, which makes it a 48v 18ah pack. But I ordered a 20ah pack. I think the blue cells give it that extra juice to turn it into a 20ah pack. I dont think they are...

1. Bms is the same as the original, signal lab 2.5 2- name of battery + charger is exactly what Vpower is selling on Ebay, although I purchased it through someone on this forum. 3- probes have been put on the dead cells, and they are dead. Pack has been ripped open and dead cells have been...

Heres a question I have for people out there: Why the A123 Lithium Ion's so expensive??? I mean: I bought this pack consisting of 288 batteries, all soldered together to make a giant brick of 48v 20ah, with a charger, and a BMS for 450 + 150 Shipping. So essentially they are selling the...

Dnmun... Thank you for your offer! Here is a picture of the insides! What I am working with is a 48v 20ah battery with 4 cells fried due to faulty BMS. Reading 0 volts on 4 cells. a123 18650 cells. Purchased in China, shipped by someone in this forum, but I believe its a Vpower...

ok

Because of the hot glue situation, its starting to look like my best bet is simply to obtain a 12s BMS, 36v charger, and then snip the wires to the last 4 cells, pay them no mind, and carry the extra weight. Kind of sucks to be carrying that extra weight of the dead cells, but im pretty...

I opened up the battery, after fighting, and im not exagerrating.... I would have to say 6-10 layers of duct tape, clear tape, paper, hot glue.... Holy crap! I got to the batteries, but now its like a battery sandwich that is hot glued to hell and I cant figure out how to get it apart to...

Thanks Tench, I figured out that trick where you move the probes along! So... In terms of charging each individual cell via the BMS, how do I do that? Same way? Put black wire on black, red on white, then move down the line? I think I am going to rip apart the battery right...

Oh, math was wrong.... First 3 cells were 3.3 volt. Next 10 were 3.5-3.6. Final 3 were 0.

I think this bad BMS might have screwed me 2 fold (1) it was shit to begin with and (2) because I rode with the broken BMS, I completely discharged the 3 cells that the BMS wasn't connected to, thereby screwing up my battery, which could have been saved. Dogman, I like your idea of salvaging...

I have a multimeter and I just took measurements. Black on black + then each wire leading up to the red wire seems to have a cumulative effect, so you take the 2nd number and subtract from the 1st? I am assuming fully charged cells need to be at 3.6 volts? Well, using this method...

Well, just took another look at the situation... And MF'er BMS (Which I did not look at carefully before installing) was compromised. Whoever sold me this BMS ripped me off! I never even bothered to look at it, but I noticed on the underside of the board some parts were missing. Son...

Being that I bought the cheap(er) battery, charger, etc. (Vpower on ebay?) - im guessing that the Zener diode on the charger didn't work - otherwise, why would it fry the BMS? Some kind of current got past the charger, and then fried BMS - and (maybe?) got into the battery itself and...