On 24 dec 2012, at 16:00, "Dinse, Gregg (NIH/NIEHS) [V]" <[email protected]> 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. > > 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. > > 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. > > Gregg > Use your battery. Like a couple of hours per day. Shorter charging times could benefit the battery by not heat up the battery as much as a longer charging could do? The heat charging leaves is not positive for the life time of the battery. Ideal would be no extra heat at all, but that would need absurd long charging. Faster charging build up heat. Low cycle count should not be something to aim for by the user since it conflicts with my first recomendation. It could acctually be seen as something negative to see very low cycle count on a battery that's been used for some time. If it has not been used much for some time it has probably less life time left than it could have had. For longer times of activity it could be hold near 50% charged. If it is not possible to look after the amount of charge for a long time it is better to strart out with more charge or full charge. The battery dies if it drops under a certain level. A bit lower than when just reached what is displayed as 0%. You do't want to let an empty battery lay for any longer period of time. Charge it when empty! // John Stalberg _______________________________________________ MacOSX-talk mailing list [email protected] http://www.omnigroup.com/mailman/listinfo/macosx-talk
