Operation without battery (GTA02)

Andy Green andy at openmoko.com
Fri Jul 18 16:50:52 CEST 2008

Hash: SHA1

Somebody in the thread at some point said:
| "Jeffrey Malone" <ieatlint at tehinterweb.com> writes:
|> I've actually been able to run the phone without a battery.  I booted it,
|> plugged in the wall charger, and removed the battery.
|> It sat working for an indefinite period of time, while registered to
the GSM
|> network and with GPS and wifi on (I was testing to see if removing the
|> battery could aid GPS).
|> Using USB from a computer failed to provide enough charge.  In fact, I
|> noticed last night that while running 2007.2 with GSM and wifi on,
the phone
|> was not able to actually charge from USB.  It was in a "charging" state,
|> drawing power from the USB port.  But it was insufficient to counter the
|> actual power usage of the phone, and its battery level would very slowly
|> drop (about 1% every half hour).
| That's fairly consistent to what's explained at :
| http://quickstart.openmoko.org/#chargerdetection

Normally though the host PC would "enumerate" the Freerunner, and this
indicates to it that it can pull 500mA (2.5W) from the host which is
more than enough to run the device (~680mW) and have the rest used for
charging.  So I would expect it to charge under these circumstances
rather than slowly decay.

The /sys nodes I mentioned will tell you the truth about what the
battery is really experiencing from its point of view.

- -Andy

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