Support on INR21700 batteries

[HKGDot]

I've tried adjusted the operation voltage from 3.7-4.2 to 2.5-3.7 for my INR21700. Seems the low power logo still pops out when I set the min/crit to 2.6 and low to 3.0.
Appreciate for any advises on voltage config need to adjust other than config.cpp. Have a good day!

[lmarzen]

The low power log is displayed when the battery voltage falls under LOW_BATTERY_VOLTAGE.

VERY LOW and CRIT levels are used to determine how frequently the esp32 should wake up to check if the battery has been charged etc, but the LOW determines when the warning fills the screen and the display no longer updates.