LiPo Battery voltage difference across cells

[alexanderait]

Total novice with electronics, and having problems with a lithium polymer battery (it is a robotics project built by someone else but I need to get it functioning). When charging the battery, the charger is telling us that there is too great a voltage difference across the cells.

What could be causing this and is there a way to reverse it?

The battery is GENS ACE 2S-5000-100C HARDCASE. Any help with this would be amazing

 

[Audioguru]

That is a very powerful battery when it is new. Your charger is smart enough to detect damage in the battery and refuse to charge it preventing an explosion and/or fire.
A Li-PO battery might have physical damage or internally have one cell with a voltage too low (less than 3.0V) or too high (over 4.2V).

 

[alexanderait]

That is a very powerful battery when it is new. Your charger is smart enough to detect damage in the battery and refuse to charge it preventing an explosion and/or fire.
A Li-PO battery might have physical damage or internally have one cell with a voltage too low (less than 3.0V) or too high (over 4.2V).

Thanks for the response.
So too low a voltage in one of the cells is permanent damage? There is no way to reverse it and make the battery useable again (without risking fire)?

 

[Audioguru]

A cell with a voltage too low might have physical Lithium metal plated where ions should be there.
When some chargers detect a low voltage then they attempt charging at a very low current and if the voltage slowly rises without the battery temperature rising then the battery will be fine. The Lithium plating might be very thin and a normal charging current would cause it to overheat or fuse causing an explosion/fire. Lithium is a flammable metal similar to magnesium and plutonium.

You should be able to measure the voltage of each cell on your battery.