ANSWERS: 1
  • It is the voltage that matters for the device. The amps measurement is how much power the battery can push if the device asks for it. Your little device will only ask for 0.5 amps (if that, ratings are usually conservative). The 640 amps figure doesn't matter much - that is the amount it could dump into something that needed it, like a starter motor. What you want is actually the Ampere-hour capacity of the battery. Typical batteries will give perhaps 40 to 60 amp-hr, which would translate to 80-120 hours minimum with your device - more if the device does not pull its maximum current all the time.

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