So I have a question... I'd like to manage Li-Ion battery operation on SBCs using the AXP209 power management chip (especially the Banana Pro, as that's what I have...)   I soldered a connector to the battery terminals on my BPro for portable operation, and it would be nice to have some kind of solution to raise an alert at low battery charge (like via the onboard LEDs), and automatically call system shutdown at a certain level.   Googling has shown that the AXP209 has an i2c interface fo