Tim Niemeyer schrieb: > Hallo Shawn, Hi! > * Shawn Rutledge <[EMAIL PROTECTED]> [10-01-08 14:19]: >> Well what's the best uptime on battery that has been seen so far, with >> unmodified phones and with an existing software image? I see less >> than 20 minutes when I'm trying to just use it as a GPS (logging track >> points). GSM talk time ought to even be longer than that, but this is >> without being connected - just sitting there idle. And as others have >> observed, if it is in more of a standby state, you still get mere >> hours at best, right? 5 days seems wildly optimistic to me, but if >> it's achieved it would be better than the average "smart" phone (all >> OS's included). > with actual battery you need to minimize the power consumption to 10mA for 5h > lifetime! > > When i was GPS logging for OSM (Navit with map input from it's own > output, was very nice), neo runs easily several hours!
That seems realistic, yes. > Today, i played a bit with power measurement and standby. > It was very surprising, and the actual power was very different from time > to time. Sometimes neo booted and did draw about 400mA in idle. Sometimes only > 280mA. Yes, the runtime power is comparable dramatic - and about 50% of it is caused by the LCD backlight. When reducing backlight brightness this can dramatcally be decreased. > In Standby mode it was exacly the same, but most the time it tooks > ~80-95mA. Sometimes only 65mA! > One time the neo did draw only about 20mA! Don't know what was > different: booted -> standby -> 20mA! I think this 20mA was drawn by the > GSM. Right. If all other devices are properly switched off, only CPU is in standby and SDRAM is in self-refresh then the device should not draw more than ~4mA. A constant drain of 18mA or more from the GSM really kills the battery life - 20mA means roughly 60 hours of standby, which is acceptable but still not good. In standby really every single mA makes a huge difference... > Tim Niemeyer Cheers nils faerber -- kernel concepts GbR Tel: +49-271-771091-12 Sieghuetter Hauptweg 48 Fax: +49-271-771091-19 D-57072 Siegen Mob: +49-176-21024535 -- _______________________________________________ OpenMoko community mailing list [email protected] http://lists.openmoko.org/mailman/listinfo/community
