On our van trip across the country my aunt and uncle gave us two hand crank (dynamo) LED flashlights which are really useful to keep in the van. The self-charging nature of the flashlights are very nice, in that we can leave them in the van and just wind them up when we need light. Unfortunately, one of the flashlights started to dim and refused to hold a charge. When I got home and opened it up, I found that the rechargeable Li-Ion coin cell inside had died. It originally used a 2032 coin cell rated at 40mAh.
Once I had it open, I decided I may as well fix it, and if I was going to be replacing the battery I may as well buy a bigger one (or two) and give the flashlight Continue reading