Can this 12 volt battery pack be brought back from the dead?

[Hot Brass]

Hi:
I have a pair of heated gloves that use a 3 cell 12 volt 2600mAh battery pack each and I am assuming they are 3 18650's each....anyways after charging with it's wall wart charger,both packs come off at 11.45 and 11.51 volts,but one of the packs goes dead in about 7 minutes after turning on the gloves and reads 0 volt.The battery packs have been sitting for quite a while,maybe 10 years,so I am guessing one is finished,but can it be brought back to life without disassembling the pack? This is the battery pack they use:https://www.google.com/search?q=mot...ECAwQBA&biw=1013&bih=481#imgrc=prTNQV2YLFcbOM Thanks,HB

 

[Lynx_Arc]

Either the charger isn't working or you have bad cell(s) as it should charge to around 12v, up to 12.6v even.
I somehow doubt you can get to the bottom of it without taking it apart if you can't access individual battery terminals (4 wires?) then you can't tell what is going on.

 

[Hot Brass]

Either the charger isn't working or you have bad cell(s) as it should charge to around 12v, up to 12.6v even.
I somehow doubt you can get to the bottom of it without taking it apart if you can't access individual battery terminals (4 wires?) then you can't tell what is going on.

Thanks...HB

 

[john61ct]

A high voltage says nothing.

State of Health is defined by actual mAh **capacity**, the ability to support loads at X amps for Y minutes.

Once that capacity is gone it's gone, sometimes a "resuscitation" protocol might bring say 10-20% back, extend life for a couple dozen more cycles

but back from the dead good as new is a myth