How long are you charging them for? I have a little timer that you may use for lamps while on vacation to turn them off/on every day. I set it for 4 1/2 hours when I sleep at night, that way it shuts off the power to the charger, not allowing it to overcharge. They are supposed to stop charging when the light goes green, but there's a chance that it could still be overcharging. Just an idea. Under $10 for a little peace of mind.
http://www.advancegreenhouses.com/Timers and Controls/Grounded Cordless Timer.jpg - Similar to mine, mine only has 1 on/off selection (1 green, 1 red setting), but it should give you an idea of what I'm talking about.
http://www.advancegreenhouses.com/Timers and Controls/Grounded Cordless Timer.jpg - Similar to mine, mine only has 1 on/off selection (1 green, 1 red setting), but it should give you an idea of what I'm talking about.
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