I have a few old Li-ion 3.7V batteries from various smartphones and cameras and would like to re-purpose them as I have found them to work quite well in LED flashlights
Only thing I am worried about is relying on the low voltage protection of the battery, or find a way to have the flashlight not function once the battery hits a certain threshold.
The leveling circuit in the flashlight will keep the voltage at 3.6V even if the battery voltage goes down to 1.6V (using 2 AA batteries)
I am able to get better battery life from the Li-in battery but I have no idea of how much damage I am doing to it by relying on it's internal protection. Does anyone have experience with re purposing old batteries for use in flashlights
And if it is safe to rely on the internal protection, I have a more expensive 10,000 mAh 3.7V battery that I would like to use