Batteries work great, and nice to have a charger that charges all four simultaneously. Ordered this because I misplaced my one battery that came with the U818a. Given the short flight time of the U818a, it is so much nicer to be able to swap out for the next battery and keep going. We would have enjoyed the drone experience so much more had we had these extra batteries these last couple years. Recommended. Make sure the connectors are pressed in all the way for charging and flying.
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