On Wed, Dec 15, 2010 at 11:45 AM, John Gardner wrote: >> Not with that kind of abuse they won't. > > Nobody's making him use an AA. This'd work... > > http://www.thomasdistributing.com/shop/maha-imedion-c-cell-5000-mah-low-d= ischarge-batteriesbrtwo-battery-pack-p-2256.html?SP_id=3D&osCsid=3Dalbeob4k= eac7bm9q42fh3bd350 > > 9500 mAh D cells are also available. This would make a good battery for a portable charger: http://www.sparkfun.com/products/8483 (2Ah lithium polymer battery $17) Approx. 7 Wh at 36 grams versus 5.5Wh at 104 grams for 4 typical NiMH cells= .. The boost converter for 3.7v to 5v would be pretty simple. You would need a low voltage cutout and special charge circuit though. - Martin --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .