How do I tell if my battery is dead?

[Racefan55]

I have a NEBO slyde that has a rechargeable 18650 battery. When I plugged it in to recharge it last night it discharged the battery & now it's dead. Could it be that the battery life span is done & I need to replace it or is it likely a problem with the light?

 

[aginthelaw]

Is the battery installed in the proper direction? Do you have Any other lights that use that battery or a standalone charger you can try it in? Got a battery tester to see if it's completely dead? Does it have a protection circuit?

 

[Racefan55]

Is the battery installed in the proper direction? Do you have Any other lights that use that battery or a standalone charger you can try it in? Got a battery tester to see if it's completely dead? Does it have a protection circuit?

The battery is the the right direction. It charges in the light & was never out.-no other lights with that batt.
I have a multi meter I could test it with. NEBO says it has over/under charge protection built in.

 

[Racefan55]

I checked it with my multi-meter & the voltage was 0.00

 

[archimedes]

Li-Ion are "empty" long before getting down anywhere near zero voltage, which suggests perhaps a tripped (or damaged) protection circuit

 

[alpg88]

0.00 mans open circuit, pcb is triped, try charging it in another charger, if it fails, either rip off protection circuit, or toss the cell.

 

[ChrisGarrett]

0.00 mans open circuit, pcb is triped, try charging it in another charger, if it fails, either rip off protection circuit, or toss the cell.

No, that's incorrect since some quality chargers won't reset the PCB, as a rule.

Nose to nose with a fully charged cell and then short the negatives with a wire.

If that doesn't work, strip the cell down.

Chris

 

[alpg88]

No, that's incorrect since some quality chargers won't reset the PCB, as a rule.

Chris

that is wrong since some chargers DO reset pcb.