Make Magazine explains how to power a Raspberry Pi from an 18V power tool battery: http://makezine.com/projects/portable-pi-power-raspbery-pi-to-go/
The author first tried a simple linear regulator, which overheated, then an off-the-shelf car adapter, which didn't have a stable enough output to keep the Pi from crashing. Finally he tried a custom circuit using a Murata's OKI-78SR-5/1.5-W36-C, which puts out 5-volts at 1.6 amps. The OKI-78SR series are switching regulators designed to be almost drop-in replacements for the old 78xx linear regulators, requiring minimal support components. -Tom _______________________________________________ Hardwarehacking mailing list [email protected] http://lists.blu.org/mailman/listinfo/hardwarehacking
