[ltp] [ltp]Questtion about battery

[Henrique de Moraes Holschuh]

On Wed, 28 May 2008, Timothy Murphy wrote:
> Sorry to be a skeptic, but is there any evidence that this
> actually increases battery life?

Yes.

> I would have thought that if this was so
> then battery/laptop manufacturers would have included this
> as part of the standard operating system?

They did include it as aditional software that is always pre-installed.

The HARDWARE power-on default is the one for emergency use: fill the
thing up if it is not almost full (stop at 100%, start at something like
97% or above, I have never checked).

The "that other O.S." utility hints to you that not charging to full,
would be better, and it suggests a percentage.  I think it was 95% or
86%, can't recall which.

The EC stores the thresholds until it is powered down.  Most ThinkPads
will power down the EC *only* when it is on ACPI S5 and the AC adapter
is unplugged.  I am not sure what it does on ACPI S4.

The thresholds are NEVER saved to any non-volatile storage.  It is just
that the EC is not rebooted or powered off except to avoid draining
batteries when the notebook is powered off AND not connected to AC.

-- 
  "One disk to rule them all, One disk to find them. One disk to bring
  them all and in the darkness grind them. In the Land of Redmond
  where the shadows lie." -- The Silicon Valley Tarot
  Henrique Holschuh