This calculator will help you optimize the number of batteries and chargers you need to fly as much as you would like. It calculates the cheapest alternative to get the most flights depending on how long your day at the field is.

Keep in mind that the rest time includes time switching batteries, putting batteries on chargers, BS'ing with the guys, waiting for others to fly, and letting your motor and BEC cool.

Depending on your choices this may take 15 to 20 seconds to calculate so be patient.