Li ion battery pack zero voltage yet green light on charger

[warek]

Hi guys
I bought a new 7.4 volt 4 cell (4000 mah) protected battery pack from Dinotte and it was tested below it left USA for Australia. When you plug it into the bike lights the light is supposed to flash a couple of times. No flashing so I measured voltage and it was zero.
When I plugged the battery pack into 2 different li ion smart chargers they both showed green led indicated 80%+ charge.
Dinotte has replaced battery, excellent after sales service, but I still have battery . I have tried plugging unplugging charging for 2 minutes 3 or 4 times, no difference.

Does anyone have any suggestions how I might get it to work.

regards

Kevin

 

[missionaryman]

I have a suggestion - put it into a lipo bag and bury it about 2m deep in a field somewhere

There's obviously something wrong, I tried to get results with a faulty battery once and it exploded in my hands, got acid all over my face and heard ringing for about 2 months

 

[tebore]

Well most smart chargers with red and green lights will stay green (indicating it's not charging) with li-ion/po that have voltages too low to be recharged.

Green lights on dead batteries is normal because it's showing it's not charging I'd be more worried about a charger that's showing red (charging) with a 2.0v cell.

The problem could be the protection circuit in the pack. It's Rare that a pack can go from full to 0v in such a short amount of time (I'm assuming a week or 2). You can try to disassemble the pack and test each cell and replace the protection circuit if you're handy. If the Voltage of each cell is lower than 2.5v then they shouldn't be recharged.

 

[LuxLuthor]

If you have 0 voltage, then likely the protection circuit tripped. It is hard to give much of an answer not knowing the details of the pack, type of cells, type of PCB, type of charger, etc.

What some may consider an "intelligent (lithium) charger," others may consider that an oxymoron. I have also seen people use a NiMH "intelligent charger" on lithium cells, which is now a reflection on the user.

No inferences are intended, there is simply not enough information provided to give a useful reply.