Battery discharging while phone is off

[Matt Mets]

I hooked up a current meter between my battery and the phone, and noted 
that my Neo draws around 41mA (meter not calibrated recently) after 
turning on then off.  The -P option with the shutdown command doesn't 
seem to have an effect on this.  As Fabien noted, if I physically 
disconnect the battery for a few moments after shutting down, then 
reconnect it, the phone draws much less current, approximately 70uA, 
which is why the battery does not drain overnight.  Another interesting 
thing I noted was that if I only disconnect the battery for a very short 
time (maybe 1 second), the phone then draws 14mA instead of 41.

My conclusion is that unplugging the battery for a few seconds after 
turning off the phone does seem to be a (poor) workaround to this for now.

Note: all of these current measurements were done with a recently 
charged battery.

I was thinking that making a little embedded current measurement device 
(something like National's LM3824 connected to a microcontroller, 
connected to the Neo via one of the onboard serial busses.  Does anyone 
have something like this already set up, or have interest in building one?

Regards,
Matt

David R. Newman wrote:
> 1. I've never noticed a power drain when my Neo is off. But then I only
> got it last week, so either the hardware, or the recent versions of the
> software, are better. I'm using Sunday's version of the kernel and
> rootfs, as I cannot ssh into Tuesday's version.
>
> 2. I noticed that the shutdown command has an option -P to power off. So
>
>  shutdown -P -h now
>
> may well shut it down fully. Where would I look to check if the menu
> with the power off option calls shutdown -P ?
>
>