On Tue, Nov 22, 2011 at 02:14:30PM -0800, Bret Foreman wrote: > Solar is not an option but outboard batteries might work. Charging > through the USB port is not very efficient, though, so I'd lose a lot > of the benefit of a big external battery.
You don't have to *CHARGE* through USB...just power your device with the USB charger. For safety purposes, I suggest avoiding a lead-acid battery. Pick up some large 12 VDC gell cells and put them in parallel. Then connect them to a cigarette lighter USB charger/power supply and use that. Use a good DMM (e.g., a Fluke 77, etc.) and measure the current usage during both modes and the respective times, and do the math for mAH requirements for the gell cell pack. Then determine how many gell cells you need. Make sure they are all healthy and charged at the same level (charging them while connected in parallel should do). HTH. Later, --jim -- THE SCORE: ME: 2 CANCER: 0 73 DE N5IAL (/4) MiSTie #49997 < Running FreeBSD 7.0 > [email protected] ICBM/Hurricane: 30.44406N 86.59909W Do not look into laser with remaining eye! Android Apps Listing at http://www.jstrack.org/barcodes.html -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
