Originally Posted by froze
Buy yourself one of those cheap lamp timers and just set the timer for as long as you want to recharge, and the timer will shut the charging process off...automatically!
I've had no problems with rain with my Cygolite Metro.
As I've said before, a timer and a NiMH battery are a recipe for disaster! The NiMH chemistry is very sensitive to temperature. If you get the battery too hot during charging, as can happen when using a timer, you will kill the battery! Not if, will.
You need a charger that measures the change in voltage (dV) and measures the change in temperature (dT).