EV2Go wrote: I'm not sure if it was taking charge when plugged in because there are no lights to indicate.
If you can, watch the voltage with a multimeter when is is charging. I expect 2.9 V to be so low that you'd see quite a bit of change of voltage as it charges.
If it shoots up very quickly, say to > 3.5 V in less than 10 seconds (wild guess), I'd suspect that the cell has a high internal resistance, and is not usable. Actually, I strongly suspect that to be the case, without seeing the voltage, but this should confirm it.
Edit: if it's not convenient to measure while charging, just measure after it has been on charge for a minute or two. You can obviously measure the voltage when not charging. I would expect to see some change in the voltage after even a short charge like that.
I suppose it could be the charger; if so the cell might still be OK, just lost come capacity. I would use a bench power supply to charge it independently of the built-in charger, but you may not have one handy. If you do, use a charge current of perhaps 200-250 mA (around 0.1 C) for safety, and don't let it and a voltmeter out of your sight. I've seen the fires that improper charging can do to LiPos, and even laptop-like (LiCo?) types.
Nissan Leaf 2012 with new battery May 2019.
5650 W solar, 2xPIP-4048MS inverters, 16 kWh battery.
1.4 kW solar with 1.2 kW Latronics inverter and FIT.
160 W solar, 2.5 kWh 24 V battery for lights.
Patching PIP-4048/5048 inverter-chargers.
