Letter Re: Some Real World Battery Life Data
Hi Jim, There are batteries becoming widely available these days with the lithium/iron-phosphate chemistry (different than the lithium/cobalt chemistry in laptop batteries). These lithium iron phosphate (LiFePO4, or LFP) cells were first used in Dewalt brand lithium power tools. The main advantages are a vastly improved cycle life (2,000 – 7,000 cycles versus 500-800 for lead acid and 500-1000 for NiMH), high discharge current closer to lead acid, better deep-cycling performance, they won’t explode like laptop batteries and need no maintenance, venting or caustic chemical refills and they operate at almost 100% efficiency. If you topped these batteries off once …