Messages in this thread | | | Date | Fri, 16 Apr 2010 06:15:09 +0200 | From | Pavel Machek <> | Subject | Re: Low-Level and Long-Term Battery Control |
| |
On Thu 2010-04-15 16:42:56, David Rees wrote: > On Thu, Apr 15, 2010 at 11:02 AM, Pavel Machek <pavel@ucw.cz> wrote: > >> For Laptops, it is better to extract the battery from the Laptop when > >> the computer will be on power for a long period. > >> I ask if the kernel can do such control without the user intention and > >> in an automatic way. > >> > >> Some BIOS provide to the user to select whether to block the battery > >> charging to 50% to make it stand for more time. > > > > Where have you seen that? > > I do recall that some older ThinkPads had a utility that would let you > determine what "empty" and "full" was by setting artificial limits. > It's well known that by keeping batteries from being fully > charged/discharged can significantly extend it's useful life although > you will suffer from shorter run-times. How sensitive a battery is to > this depends on it's exact chemistry, but all are affected by this to > some degree. > > For example, by keeping your battery from charging above 85% and below > 15% can increase the number of charge/discharge cycles a large > amount
From charging below 15%?
> often on the order of 5-10 times more charge/discharge cycles - much > more than the 30% reduction in total capacity. Limiting to 25-75% > will help even more.
I believe I've seen "don't charge above 85%", but "don't charge above 50%" is quite excessive...
Anyway, this is done by smartbattery, not by OS. Pavel
-- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
| |