[Robotbeat]

The cost of replacing a battery is about the same cost as a turboprop engine overhaul, and depending on the battery type and other details, it may occur less often.

Turboprop engines like the PT6 have a Time Between Overhauls of about 3000 hours, maybe longer. At 240 knots, that's 720,000 nautical miles between overhauls. If your electric aircraft has a range of 500 nautical miles and a 1500 cycle life, that's the same time. For an electric aircraft with a 900kWh battery like the Eviation Alice, and a cost per kWh of $170-$300/kWh, that's $150,000-300,000, the same as a turboprop engine overhaul.

Cycle lifes well beyond that are feasible, though, and battery costs are reducing over time.