Messages in this thread | | | From | David Rees <> | Date | Thu, 15 Apr 2010 16:42:56 -0700 | Subject | Re: Low-Level and Long-Term Battery Control |
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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 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.
-Dave
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