Tablet2 Battery Charging

The key is to switch to "BAT" position before connecting the charger. Charging of completely depleted battery requires having serial connection and stopping in uboot.

=Charging of completely depleted battery=

Connect serial cable

 * Attach host machine to target now

Leave it for 1 hour, and then let kernel to boot
If battery is charged to the level at which the kernel can boot, the battery charger can be continued with USB or AC charger

=Regular Charging=

AC charging

 * Flip power switch on "BAT", connect AC connector, then charging should start
 * If you at first connect AC connector and then flip switch on "BAT", charging will not start