Originally Posted by geekmaster
After you get enough charge with a wall charger to use MfgTool, switch to fastboot mode.
Try charging in fastboot mode. When my K4 (and my touch) were in fastboot mode and connected to a USB port, the serial port showed a steady voltage increase until it reached its maximum voltage.
This takes a number of hours from a low-voltage battery condition.
It does NOT charge. After about 30 minutes LED turns off.