Bad lipo cell

[yopappamon]

I sent my controller to methods to have a CA calibrated so I was riding my backup 9c hub, standard 22amp Infineon controller, and 44v lipo 20ah. 8 hobby king 6s 5000mah 20c with maybe around 50 cycles on them. Even when I'm riding my Lyen controller and 1000w Mac hs geared hub it tops out at around 40 amps.

I noticed one cell in a pack was about 0.25v lower than the rest. I've only ever seen a 0.03v imbalance at most.

Tried putting the pack on a 3 amp meanwell and a battery medic. The low cell just wouldn't close the gap. Put it on the rc charger for 4 balancing cycles. All other cells were up around 4.2v but the bad cell never got over 3.8v

Let it set for 3 days and put a battery medic on and the bad cell reads 1.25v

Crap, anyone know when hobby king is getting these back I stock? :|

Is there anything useful to do with a 5s pack?

 

[neptronix]

I turned my bad cell packs into magicshine batteries. You can always use them as spare cells too.
To the others... always buy 1 more pack than you need. You will inevitably get a dud.

 

[HighNear90]

Is there anything useful to do with a 5s pack?

I use my 5s packs to power my 18v cordless tools. They work great!

 

[yopappamon]

Maybe I'll cut the bad cell out and run my lights off it.

 

[yopappamon]

Is there anything useful to do with a 5s pack?

I use my 5s packs to power my 18v cordless tools. They work great!

Great idea, I'd have to buy some tools though.

5 cells is what, 20.5v? I could solar charge that.

 

[dogman dan]

This looks to be in US stock.

http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=16706

this link to just stuff in the USA warehouse http://www.hobbyking.com/hobbyking/store/US.asp?HobbyKing_USA_Hobby_Warehouse