After calculating the average mA power draw of a radio, just divide the battery's advertised mAh capacity by
the radio's mAh draw to get the runtime in hours.
my tested average power draws:
Heltec V3: 193mAh (714 mWh at 3.7v) (13 hours on 2500mAh 3.7v battery)
Heltex HTIT Wireless Tracker: 287mA (8.7 hours on 2500mAh 3.7v battery)
Heltec HTIT Wireless Tracker:
78 mA bt off disp off
102 mA bt off disp on
155 mA bt on disp off
175 mA bt on disp on
It looks like with the display off, ESP-32 power draw DOUBLES when bluetooth is left turned on.
Those aren't average power though, they're lowest power. Transmit bursts and other factors lead to a much
larger average power draw.
Heltec HTIT Wireless Tracker Wh test started at 1:00am, BT and display are OFF. Power supply set to 4.0
volts, 2.0 amps maximum. 2.264 Wh used by 9:26am, that's 8.43 hours, averaging 269 mW power draw.
Heltec V3 Wh test started at 9:57am, BT and display are OFF. Power supply set to 4.0 volts, 2.0 amps
maximum.
