Battery losing charge while off [Devel Digest, Vol 75, Issue 63]

[Yioryos Asprobounitis]

--- On Fri, 6/1/12, Richard Smith <richard at laptop.org> wrote:

> From: Richard Smith <richard at laptop.org>
> Subject: Re: Battery losing charge while off [Devel Digest, Vol 75, Issue 63]
> To: "Yioryos Asprobounitis" <mavrothal at yahoo.com>
> Cc: devel at lists.laptop.org
> Date: Friday, June 1, 2012, 7:32 AM
> On Thu, May 31, 2012 at 12:41 PM,
> Yioryos Asprobounitis
> <mavrothal at yahoo.com>
> wrote:
> >
> >
> >
> >>
> >> On 05/24/2012 11:59 PM, Yioryos Asprobounitis
> wrote:
> >>
> >> >> laptop serial number.   Was it a
> >> >> pre-production XO-1 ?
> >> >
> >> > Both XO-1s used to test the battery are C2
> machines
> >> > #CSH7470023EA
> >> > #SHF80701C99
> >> > The batery in question is
> >> > #00802091012110003588
> >>
> >> So let me review and see if I have all the
> details.
> >> Seems like each new
> >> email has more new details.
> >>
> >> - Battery does not lose charge outside the laptop.
> >> - Tested the battery in 2 different laptops and the
> loss is
> >> the same.
> >> Roughly 12% overnight.
> >> - A different battery in those same laptops does
> not lose
> >> 12%
> >
> > Correct in all 3 (but ~12% in a 24h period)
> 
> Ah... 24 hours... Looking back you said that in the original
> email.
> So 12% is about 370mAh which at the nominal battery voltage
> should be
> 2.2 to 2.5 Wh.  Over 24 hours that a draw of 90 to 100
> mW.  Thats high
> for the EC not going to into stop mode but perhaps there's
> enough
> error in the measurement to skew the results.
> 
> My 1st guess is that something in the battery EEPROM is
> making the EC
> unhappy and its not going into stop mode when the power is
> off.
> 
> Put the funky battery in the laptop and boot it.  Then
> stop at OFW and
> do a 'bat-dump-banks'. Then send on the output.

Done
See attached screenshot. 

> 
> -- 
> Richard A. Smith
> One Laptop per Child
>
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