John Wayland wrote: >They rate them at 600 cycles, because at that point, the batteries >are only delivering 80% of their rated capacity....this means that >there are still lots of usable cycle left, and who knows how long >they will keep going at the reduced level? In any event, with 130 >mpc capability, you're looking at greater than 70,000 miles of pack >life!
Is that last bit correct? I've seen this elsewhere, as well, and I was wondering if it is just math, or if it is based on real world experience? Is it really accurate to say that a battery which gets 130 miles per charge and 600 cycles gets 600*130 = 78,000 miles in real use? How much is a "cycle?" Until the battery is 80% discharged? If so, does a 40% discharge count as half a cycle? Less? More? What are the applicable "rules" for making this kind of calculation? I realize that it is mostly comparative, anyway, as actual battery life depends greatly on use patterns, and different patterns affect different batteries in different ways. I was just wondering how accurate this kind of shorthand prediction might be, and what the variables are. Thanks, -- -Adam Kuehn
