[Gta04-owner] Battery charger

Flemming Richter Mikkelsen quatrox at gmail.com
Wed Feb 13 20:48:00 CET 2013


On Feb 13, 2013 10:45 AM, "Rico Rommel" <rico at bierrommel.de> wrote:
>
> Am Mittwoch, 13. Februar 2013, 10:08:16 schrieb Benedikt Bär | Relamp.tk:
> > Hi,
> >
> > Anyone knows how many mA the GTA04 needs with GPS on?
> > I have a charger that provides up to 650mA, will that suffice?
>
> It is enough, but on dumb chargers you will need a USB-cable with shorted
D+
> and D- or you can try this udev-rule:
>
> SUBSYSTEM=="power_supply", ACTION=="change",
> DEVPATH=="*power_supply/twl4030_usb" ATTRS{1-0048/twl4030_usb/id}=="200k",
> ATTR{../../max_current}="500000"
>
> > How can I check if it's charging (sys-paths)?
>
> /sys/class/power_supply/bq27000-battery/status
> /sys/class/power_supply/bq27000-battery/current_now
>
> Problems I noticed:
>
> After resuming from suspend power consumption is crowing more and more. It
> sometimes reaches more than 500 mA with display on and then it doesn't
charge.
>
> If battery charge is below 60% it regularly disconnects USB and does'nt
> charge. You have to reconnect the charger. I have the suspicion, voltage
> reduces with discharging battery too and gets to low.

In case you were thinking about the battery voltage, note that the voltage
on lithium batteries are stable!! (until it is maybe 3% remaining current).
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