I'm using a 3.7 Volt Lipo pack (4.2V when fully charged).
Made the pack by soldering 3 1300 mAh cells in parallel (3p configuration) getting a 3.7V 3900 mAh pack.
Transmitter stops working when pack reaches 3.3v so it is safe to use without cutoff (as long as you don't forget to turn off the transmitter when putting it away).
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