How long laptop battery should live ?
smithi at nimnet.asn.au
Thu Nov 25 12:42:36 UTC 2010
On Wed, 24 Nov 2010, David DEMELIER wrote:
> Thanks for all your answers, I guess my battery is getting on its end of life..
> After running 30 minutes on battery, the percent is still 100% while
> the remaining time is slowly decreasing.. Aaaah buying a new battery
> costs around $134 !
Despite what its internal chip [mis-]reports, how long will it actually
run on this battery with a moderate or no load? Watching actual battery
voltage, say once a minute as it runs down, or while charging, will give
you a much better idea of real condition. I tend to run something like:
% cat ~/bin/t23loop
[ "$1" ] && sleep=$1 || sleep=60
while true; do
t23stat | tee -a ~/t23loop.out
% cat ~/bin/t23stat
echo -n "`date` "
sysctl dev.cpu.0.freq dev.cpu.0.cx_usage
sysctl dev.acpi_ibm | egrep 'fan_|thermal'
acpiconf -i0 | egrep 'State|Remain|Present|Volt'
.. but just logging date and the acpiconf would be enough for this.
Have you tried one round of the battery meter conditioning I mentioned,
to see if it shows any improvement? Worked for me, anyway <shrug>
> I think I could live a few months before buying a new one but it sucks :-/
Clues to save power may be helpful but don't really address this issue;
still, one of the best is http://wiki.freebsd.org/TuningPowerConsumption
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