On Dec 24, 2012, at 8:00 AM, Dinse, Gregg (NIH/NIEHS) [V] wrote: > On Dec 23, 2012, at 7:51 PM, Macs R We wrote: > >> On Dec 22, 2012, at 11:19 PM, Dinse, Gregg (NIH/NIEHS) [V] wrote: >> >>> I thought the number of power cycles was the most important factor in >>> determining when a battery would need to be replaced. This is why I was >>> asking about the length of time between charges. If I charge the iPad each >>> night, but the battery would actually last for a week without recharging, >>> won't the battery need replacing 7 times sooner? I'm guessing that it >>> won't really be 7 times sooner, but you get my point. Or is that just a >>> myth? >> >> I'm not positive about iPads, but on Macs, fractional recharges are >> accounted for as fractional recharges. That is, if you recharge a battery >> from 50%, it's counted as half a power cycle, not a full one.
Official confirmation here: http://www.apple.com/batteries/ Note that this is not necessarily true of older technology batteries. > That's interesting. If a fractional recharge counts as the same fraction of > a power cycle, then it should not matter how frequently or infrequently the > battery is charged, at least with respect to the impact of power cycling on > overall battery longevity. Either that, or it further divorces the reported cycle count from the real-world longevity prediction. For example, we know that batteries with extremely low cycle count (because they are hooked up to AC all the time) actually tend to fail fastest. > If that's true, and I'm certainly not saying it isn't, that seems like good > news for those of us who have been trying to monitor battery status and wait > until the battery is low. > > Thanks for the information. -- Macs R We -- Personal Macintosh Service and Support in the Wickenburg and far Northwest Valley Areas. http://macsrwe.com _______________________________________________ MacOSX-talk mailing list [email protected] http://www.omnigroup.com/mailman/listinfo/macosx-talk
