[maemo-developers] [maemo-developers] Re: Measuring power consumption of 770

[From: Frantisek Dufka]

Heike C. Zimmerer wrote:
> 
>  I don't know of any mobile or
> laptop which does some real detection.

Well it doesn't mater how much it is real (=accurate) but whether there 
is such circuit which simply stops charging and cuts also the input from 
battery to not discharge it when you have AC adapter. This is IMHO done 
in all modern laptops with li-pol batteries to extend life of battery. 
Otherwice regular charging and discharging near the 100% and 99% level 
would kill the battery in really short period. There is no such circuit 
in n770?

> 
> Even if it were, it wouldn't make much sense to measure at the mains
> plug if you can do at the battery. 
...
> To put things straight: If you measure "charger plus 770", you measure
> exactly that, nothing else.  All assumptions you draw from it about
> the Nokia's power consumption alone are worthless without knowing the
> charger's part.

Well I was not thinking about measuring at the mains plug. I was 
thinking about measuring at the n770 side (5V?) because it is a bit 
easier then opening the device and messing with battery pins.

Frantisek