Dad trying to repair a hoverboard - Lithium Cells Unbalanced? 2

[hotmustard]

Not an engineer, but humbly requesting information. When trying to charge the kids' "hoverboard" scooter, the charger (yes, I tested the charger for correct voltage w/ multimeter) causes the unit to light up and register as charging, but after hours of charging the unit still shows low charge when turned on.

Unit is rated to use 24V 2.6Ah (charging input at 24V .6A). Got the lithium battery out and tested each cell (see attached image). When I test +/- terminals on each cell (leads on the blue and red terminals in attached image), one cell reads 10.5V and the other reads 18.5V. When testing the two in series via the cable connected to the main board, I get 30.2V.

From what little I can pick up, I think that the battery pack is "unbalanced" and that may be causing part of the problem. Does that sound right and is there a way to bring it back into balance?

 

[IRstuff]

The battery controller or the battery charger is supposed to deal with that

TTFN (ta ta for now)
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[itsmoked]

Lithium batteries are made of cells that each supply about 3.6V. Since your batteries are supplying something greater than that they're each comprised of multiple cells. Indeed a cell or cells inside one has/have failed. No, not out of balance, but FAILED by now. If you under discharge a Lithium battery one time it's dead and now a major fire safety risk. Recall all the houses burned down by faulty hover boards. I suggest you find someplace that makes battery packs and recommends chargers to help you replace your shot battery packs with something functional and superior to those lame batteries. Look to the R/C world.

Keith Cress
kcress -

http://www.flaminsystems.com

 

[Jhkb]

I believe the issue you are reporting is due to one or more individual cells developing high internal resistance or otherwise have failed for some other reason. The only repair option is to replace the defective cell or cells. Do you know how to do this?

Please advise if would like to attempt repair as there are several steps you must tie along with a few cautions. Happy to assist if repair is desired.

Thanks