We are running into battery detection problem.
When the device is left on the shelf for long time, and battery is completely drain out, the low voltage protection circuit will cut out the cell.
When AC is plugged in, TPS65072 found that no battery is available. And then keep asserting pulse to detect the battery. But the battery is in protection mode and need certain amount of current to recover before the TPS65072 could detect and charge it. So we are running into this dead loop. TPS65072 could not detect and charge the battery and battery remain in the low voltage protection mode.
Another interesting finding is that if the dead battery is inserted before the DC, TPS65072 could recover the dead battery. The reason is that the first pulse voltage is higher than rest of the pulses.
If the dead battery is inserted after the DC, and missed the first detection pulse, TPS65072 could never detect and charge the battery.
What is the typical solution for the complete drain out battery? Is there a way to walk around this?