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

[From: Frantisek Dufka]

Hello Igor,

can you comment on idea mentioned in this thread about charging the 
battery fully and then measuring DC current from charger? Is this 
nonsense or not? Is the battery used when already charged and device is 
still connected to the charger? I thought most laptops and PDAs work 
this way i.e. disconnect battery and use only power from AC adapter. How 
770 works? Or is there other issues except those already mentioned? One 
potential issue is that power saving features may be turned off when 
charger is connected so the device requirements may be higher than when 
using battery.

Frantisek

Igor Stoppa wrote:
> Hi Dave,
> On Mon, 2006-03-20 at 11:00 -0700, ext david feldman wrote:
>> Will the 770 run with the recharger (or other external DC power source) 
>> attached, with the battery REMOVED? This could be same as the case of an 
>> expired battery that will no longer accept a charge. In this case, the only 
>> power consumed by the 770 would be by the machine itself, not by the battery 
>> recharge, nor assited by battery discharge.
>>
> Unfortunately I cannot comment on this issue because it has _strong_
> liability implications: when dealing with the battery there might be
> potential safety issues, in case of abuse, overcharging and so on,
> therefore it's one of the few subjects that cannot be discussed openly.
> 
>> I have not tried this idea, and it could cause unit damage or malfunction, 
>> so I do not recommend the procedure - 
> 
> Exactly, that's the point. And that's why there are safety mechanisms
> that will get in the way when trying to counterfait the battery.
> 
> The original conversation was about validating power saving algorithms
> and I was trying to help doing it without safety features becoming an
> obstacle. The simplest solution is to use an original battery and wire
> it to the connector pins. 
> 
> igor
>