From OMAPpedia

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.

Contents 1 Charging of completely depleted battery 1.1 Ensure power switch to "OFF" position 1.2 Connect serial cable 1.3 Flip the power switch to "BAT" position 1.4 Connect USB wall charger 1.5 When u-boot message appears on terminal stop it in u-boot by pressing key, don't let the kernel start booting 1.6 Leave it for 1 hour, and then let kernel to boot 2 Regular Charging 2.1 AC charging

[edit] Charging of completely depleted battery

[edit] Ensure power switch to "OFF" position

[edit] Connect serial cable

• Attach host machine to target now

[edit] Flip the power switch to "BAT" position

[edit] Connect USB wall charger

[edit] When u-boot message appears on terminal stop it in u-boot by pressing key, don't let the kernel start booting

[edit] 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

[edit] Regular Charging

[edit] 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