Round peg.. square hole.

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Ypedal   100 GW

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Round peg.. square hole.

Post by Ypedal » Oct 09 2016 12:44pm

Mamma said there would be days..... urgh..

So local customer left an eZee 48v 10ah pack drain down by accident ( unsure of how it happened, but 10 of the 13 groups were at 3.2v and the other three groups were at 0v... tried to jolt the 0v groups back to life but they just get hot and drop voltage as soon as charge is removed..... dead.. )

So, since it's out of warranty ( would not be covered anyways... not a defect issue ) may as well try to salvage it.

My water bottle packs use the same Sony V3 ( 2200mah ) cells, and i happen to have one with a damaged BMS, so today's job... take 3 groups of 4P cells.. make them 5P, then cram it into the original eZee box !

fun times !
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beast775   100 kW

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Re: Round peg.. square hole.

Post by beast775 » Oct 09 2016 10:27pm

Good luck Ypedal,im so bad at fixing batteries i have no family friendly words :lol: .
2 FINGER SALUTE TO ESSO.no buying gasoline for 14 years now.
I spent all my money on bicycles women and beer the rest i just wasted.

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Dauntless   100 GW

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Re: Round peg.. square hole.

Post by Dauntless » Oct 09 2016 10:50pm

Couldn't be so unrewarding or you wouldn't be so quick to jump on it. Have fun.
Any sufficiently advanced technology is INDISTINGUISHABLE FROM MAGIC!
- Arthur C. Clarke

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Ypedal   100 GW

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Re: Round peg.. square hole.

Post by Ypedal » Oct 10 2016 7:20am

Yeah.... this pack has something like 8 shallow cycles on it in since June 2014.. the cells that remained over 3v should have lots of life left in them, can't let it go without at least trying..

It's going to be a tight fit but i'm determined to get it back in it's box. ...
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amberwolf   100 GW

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Re: Round peg.. square hole.

Post by amberwolf » Oct 11 2016 4:16am

I have my 4lb sledge just inside the backdoor if ya need it. ;)

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Ypedal   100 GW

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Re: Round peg.. square hole.

Post by Ypedal » Oct 11 2016 7:29am

Could have used the sledge for a different reason... :evil:

I get the 3 groups reworked and crammed back in.... get the RC charger to bring the 10 other groups to equal voltage and discover group no.4 also bad........... aaarrrrggghhhhh...

when i bulk charged the pack to try and revive the 0v groups, no.4 held a charge long enough to pass as OK, but was not. ..

Took it apart again, no.4 replaced and charging / balancing now... fingers crossed the BMS will work and somehow fits back into it's box without looking oval. .. should be done today,.
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Hillhater   100 GW

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Re: Round peg.. square hole.

Post by Hillhater » Oct 11 2016 8:16pm

Shouldnt a half decent BMS prevent this type of individual cell group drain down/imbalance damage ?
This forum owes its existence to Justin of ebikes.ca

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