Quote:
Originally Posted by Davimee
Yes, very true! We'll be getting some rechargeable AAA's for our mp3 players, so we'll have to be sure to get an extra one or two to have on hand when I get a light! 
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Make sure your device was designed with rechargeable batteries in mind

Your basic Alkaline AA,AAA,C,D battery is 1.55 Volts
NiMH, NiCd rechargeable are 1.2(5) V, you are starting 0.3 Volts down if the circuit expects only Alkaline cells.
Battery makers deem a battery dead at 80% voltage.
Your device may call the quits before it reaches that level