Quote Originally Posted by Stuart View Post
I noticed that if I put the leads on the button battery, the needle would slowly, but very visibly, go down the whole time I held it on there. When I held the leads to the cell battery for a long time, the needle never moved. Also, I've been messing with this flashlight all day long and none of the readings have changed at all, no matter what I've done.

My guess is that those little button batteries have a very small fraction of the capacity as the cell phone battery so it'll take alot of flashlight shining to drop the voltage of the cell battery. If that is the case it would take a lot of cranking to charge it back up. Attach a windmill to the crank and get some stimulus money.