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These spy-flyers could get a much longer range with the second battery bank and an energy recovery circuit.

2 full batteries, double range.

Battery A goes dead (not flat, just discharged to mfg’s specs)
B kicks in with a relay
ERC charges A while B flies the critter
B runs down, A kicks in
ERC charges B while A flies the drone
and so on, until the charge system senses a lower charging level, and signals the pilot to return to base.

"ROGUE ELECTRICIAN" Hoping to be around to re-energize the New World.....

Cogito, ergo armatus sum