That is a regulator and your input voltage has to be higher than the output voltage. So use 2 batteries in series... + to - to + to - to gain 7-8 volts input.
Thanks perlionsmitnick. If 1.5A is too low what would be acceptable with 7.4 volts? and what if the resistor was connected (the heat sink) to an aluminum housing? would it get too hot to the touch? I'm thinking that here in the great white north might be nice to have a PV that doubles as a hand warmer
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