Sometimes you charge your lipos but didn't flew, so you need storage the lipos.
I found in the flite test website one simple project, so my project basically its a remix.
Added a SSD relay;
More Load resistor;
XT60 and balance connectors;
Small change in the code for better storage voltage value.
Step 1: Material
1x - Arduino Uno R3 https://bit.ly/2tThBPl
1x - SSD Relay DC-DC (Im using 100A ssd) https://ebay.to/2uqL3NG
4x - High Power Load Resistor(Im using 3R 100W) https://bit.ly/2zLZ3GK
1x - 10k
6x - 220ohm
1x - 4S Lipo Balance Conector https://bit.ly/2NntAMY
1x - Cooler Fan https://bit.ly/2NrhiTP
1x - XT60 https://bit.ly/2LqGKIJ
Leds - https://bit.ly/2KqwkYV
Jumpers for arduino https://bit.ly/2Lc8GD4
Aluminium dissipator for load resistors
Step 2: Circuit Diagram
Step 3: Building
Position all components in your own box.
Put the load resistors into the dissipator.
Wiring the leds and resistors to arduino.
Solder the 10K resistor to balance connector.
Wiring all wires from balance connector to arduino.
Step 4: Arduino Code
Step 5: Video
Thanks for watching.
Any question, please comment.