Update Power_capabilities.md

Author: chipguyhere

docs/Power_capabilities.md

@@ -13,15 +13,17 @@ located in `Power.h` and `Power.cpp`, automatically included with `#include "M5S
      these actions (including the deep sleep mode) will give the appearance and effect of being powered off.  Pressing the power/reset button turns it back on.
 - **Can it wake itself back up after a pre-determined delay or at a specific time?**
      No, since it doesn't have a real-time clock chip (RTC), but ESP32 sleep modes may provide a suitable alternative.
-- **Can it tell if it is running on external versus battery power?**
-- **Can it tell if the battery is being charged or discharged?**
+- **Can it tell if it is running on external versus battery power?** If `isCharging()` or `isChargeFull()` true, probably on external power.
+- **Can it detect the rate of charge or discharge?** *probably not, but inference can probably be made by comparing `isChargeFull()` to the charge full current cutoff*
 - **Can it tell if a battery is present or absent?** *possibly, but not formally*
-- **Can it tell the state of charge of the battery?** Yes, using `getBatteryLevel()`, which returns one of: 25, 50, 75, 100 (representing a percentage), or -1 (if unable to read)
-- **Can it read its battery voltage?** Not possible to read the voltage level directly, only the approximate percentage of 25/50/75/100.
+- **Can it tell the state of charge of the battery?** Yes, using `getBatteryLevel()`, which returns one of: 0, 25, 50, 75, 100 (representing a percentage), or -1 (if unable to read)
+- **Can it read its battery voltage?** Not possible to read the voltage level directly, only the approximate percentage of 0/25/50/75/100.
 - **Can communication with the IP5306 power controller be tested and confirmed?** Yes, with `canControl()`
 - **What other capabilities?** *(to be answered -- translation of Chinese-language datasheet is difficult to understand)*
   - *auto shutoff settings - voltage low for how long causes a shutoff*
   - *inhibit the power button, report it as an event?*
   - *setting the charging voltage and current*
-  - *distinguish between a software/hardware/watchdog/poweron reset*
+  - *distinguish between a software/hardware/watchdog/sleep/poweron reset*
   - *maintain any of the settings across power cycles and/or complete loss of all power*
+  - *how does setAutoBootOnLoad() work? when enabled, it seems the device can be powered back on simply by connecting a load -- such as
+     connecting another M5Stack controller to be powered from PORTA -- if done before the shutdown_8s time expires*