Battery Lifetime

Ken Restivo ken at
Wed Jul 16 05:13:55 CEST 2008

On Tue, Jul 15, 2008 at 08:19:38PM -0600, Scott Derrick wrote:
> I'm amazed that more isn't being said about the battery lifetime people 
> are seeing?
> I just read an article in Information Week that cited a large poll 
> concerning users of mobile devices.  What was the number 1 issue, far 
> and above any other issue people are concerned about and want to see 
> improvement.  Yes, battery life.
> The times I've seen posted here are pathetic!  8 hours of standby!  
> Christ, my MotoQ has almost 8 hours of active phone time!  8 hours of 
> standby makes the FR a toy at best.
> I realize that a lot of people are just trying to get the unit to accept 
> a sim card, or make a call,  get a gps fix, etc..  But I seriously can't 
> use it as anything but a desk toy with that kind of battery life.
> Is there an ACPI or some other kind of power monitor built in that is 
> granular enough for somebody to work on this problem using software?

I wasn't sure if you were looking for solutions or just wanted to vent, but yeah, the battery lifetime is pretty anemic.

I was going to ask what was the duty cycle of that USB connector on the phone, since I find myself constantly plugging it in and unplugging it. Kind of like I used to do with my old Palm III back a decade ago, because if you let the battery wear down then you lost all your data (talk about design flaws... that was an awful one...).

Another thing I noticed was that when I pull the phone out of its little neoprene condom, it almost always is lit up and not in sleep mode, and it also almost always has the Diversity app running (I have no idea why). Apparently the touchscreen is getting bumped and keeps waking it up when its trying to sleep. 

But one of the solutions may be possible to do in software: make the "lock" (aux?) button dim the screen AND put the thing into low-power standby, and do NOT allow any stray rubbing up against the touchscreen to wake up the phone from sleep.

Any ideas how hard it might be to do that, or where in the software it'd need to happen (i.e. userspace, kernel, uboot, etc.)?


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