Quote:
Originally Posted by coreybox
AA has a higher amp hours rating though (if I remember correctly).
The new system also has an LED running, which usually draws way more power than anything else.
I wouldn't be surprised if the new system has less life per battery, but I'm totally guessing.
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Battery life is dependent on the amperage draw of the device that it's powering. FWIW, AA batteries typically have about 2850 mAh capacity whereas 9V batteries are around 625 mAh. If you know the amperage draw of the device, it's easy to figure (approximate) battery life.
note: IIRC, two AAs would have the same mAh capacity as a single battery (in typical configuration) but the nominal voltage (1.5V per battery) would be doubled.
But I might be wrong
Tom