Added Q13 about charger operation and booting to the archos charger.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@1882 a1c6a512-1295-4272-9138-f99709370657

docs/BATTERY-FAQ

@@ -121,6 +121,27 @@ A12: In our testing we found the following results:
          HD on, reading, LED off ~ 600 mA
          HD spin up before read max 800 mA
     
-     So leaving the unit on and paused consumes ~100mA, and thus much less then
-     needing to reboot the unit.  Your mileage may vary.
+     So leaving the unit on and paused consumes ~100mA, and thus much less
+     than needing to reboot the unit.  Your mileage may vary.
+
+Q13: When I plug the charger in my Recorder, it doesn't immediately start
+     charging the batteries. And when I plug in the charger when the Recorder
+     is turned off, it turns itself on and starts charging in the Archos
+     software? What's up?
+A13: There is a switch in the DC IN jack of the Jukebox - when a charger (or
+     whatever) is plugged in, the unit is powered on, even if the charger
+     is not plugged in a mains outlet.
+     
+     If the charger is providing power at this point, the Archos firmware
+     located on the FLASH ROM does not load a new firmware version (like
+     Rockbox) from the disk, but goes into charging mode instead. You can
+     use this feature to get to the Archos charger if you want to.
+     
+     When Rockbox is running on the Recorder (the device has been booted
+     without the charger) it's power management code runs once per minute
+     (thus the charge level and charging status is only updated every minute).
+     If the battery is not full, it will start charging. If the 'deep
+     discharge' mode is enabled in the settings menu, it will start charging
+     only when the battery is almost empty.
+