> Basically what I want is to add 4 rechargable AAA batteries and plug that > into usb port. > That gives me about 1200ma at 4.8v, which should comply with the USB > specification (5v),
AAA batteries are 1.5 volts, so 4x1.5=6volts, if you find a diode that has a voltage drop of 1 volt you won't need any voltage regulation circuitry. > This should avoid the requirement for sophisticated electronics, Voltage regulators aren't sophisticated, its just a VR chip and one, maybe two resistors for calibration. >Anybody thinks that this is not feasible or not worth doing for some reason? See my post here on batteries http://lists.openmoko.org/pipermail/community/2008-September/029965.html I got a battery and charger for under £8 _______________________________________________ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community