Document with answers to most popular battery-related questions is ready

Rask Ingemann Lambertsen ccc94453 at
Sun Aug 9 03:40:29 CEST 2009

On Sun, Aug 02, 2009 at 09:20:39PM +0200, Michal Brzozowski wrote:
> 2009/8/2 Paul Fertser <fercerpav at>

> > With GSM on in suspend it should last for 140 hrs and with off it
> > should be even more.
> Really? Isn't that with deep sleep on?

   Yes. With GSM off, approximately 8 mA is drawn and the battery should
last for something like 150 hours from fully charged battery when new.

> > Hm, so basically your point is that CC allows current measurement in
> > suspend. Ok, but if there're convenient TPs you can use your DMM to do
> > the same as well. Also you can do that by connecting the device via
> > DMM to a lab PSU or a pack of AA batteries. Moreover, there's quite a
> > limited number of usecases (wrt power-management) so those who has
> > some EE skills can do the measurements once and then share the info
> > for everybody.
>  Paul, of all those acronyms I only understand AA batteries. I said I'm a
> normal user :-)

CC = Coulumb counter. Measures the flow of charge to/from the battery.
TP = test point. Makes a signal of interest on a PCB available to probes.
DMM = digital multi meter. Measures voltage, current, resistance and such.
PSU = power supply unit
wrt = with regard to *
EE  = electrical engineering
PCB = See

* Hey, you said you only understood AA batteries. ;-)

Rask Ingemann Lambertsen
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