The inaccurate battery display problem for the heltec is solved.
If you use the newest WiFi webUI you can change the ADCmultiplier ratio, so no need to recompile the sourcecode anymore.
You find this under ‘Settings’ > ‘Power’ > ‘ADC Multiplier Override ratio’
You can calculate the value simple, if the battery is fully charged (4.23 Volt) and the display gives another lower value, divide 4.23 by the displayed value which gives you the new ADC multiplier.
I’m thinking about using a helltec 2.1 as a repeater. The current used in repeater mode is between 40 and 50 mA. When sending it is about 160 mA.
I did no accurate measurement and used a simple USB-tester.