On Dec 24, 2012, at 1:01 PM, John Stalberg wrote: > 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
Hi John, Thanks for the advice. I guess I need to change my habits. :) That reminds me -- I have an old iPod that I don't use very often (sometimes not for 6 months!). When I charge it, it seems so dead that I'm always worried that it will not revive! But, fortunately, it has always eventually come back to life again. So I should probably charge that on a more regular basis, even if I am not using it very often. Thanks, Gregg _______________________________________________ MacOSX-talk mailing list [email protected] http://www.omnigroup.com/mailman/listinfo/macosx-talk
