I hope this is the best place for this question.
I have some Energizer lithium AA batteries (1.5v), that work very nicely in electronics that have heavy constant usage, such as my Apple Magic Trackpad. Some time back though, I found myself with a solar power unit from an outside patio umbrella (it had built-in lights), and noticed that the batteries inside were simply 3 generic AA cell nimh batteries. Just for kicks, I decided to see what would happen if I tried recharging some of my AA Lithium batteries.
They charge very, very slowly of course, but it definitely works. The batteries get up to a voltage (as read by a voltmeter) of 1.6v, but I've noticed that they don't hold their charge anywhere near as long as they originally did. It's a rough guess but I'd say I probably get about 20% of the original lifespan of the battery. Still feels kinda cool to be using the sun's energy rather than throwing them batteries out each time.
So I guess my question is in a few parts...
- Are there any downsides to recharging these batteries in this way?
- Why is the lifespan so drastically reduced?
- Is there a way to increase the lifespan after recharging?
- Is there anything else I should know with regard to recharging batteries like this?