Have an 18350, AW IMR, 700mah battery. Accidentally let it drain to 2.73V. Is it toast?
The bigger question right now is do you have a charger that plays nicely and knows what to do with under voltage batteries?
Charging Lithium-Ion BatteriesUltraFire WF-139? It should.
Though I just measure the battery and it's reading 4.3V. Not sure if I want to keep using this charger now that I know it's overcharging.
According to the specs of the charger I have, it does trickle charge when the voltage is under 2.7... I'm just curious if letting it charge my batteries to 4.3V is going to shorten their life. It should be shutting off at 4.2V.