[libria]

Let me rephrase: why would companies consider battery life a limit when liquid fuel is a viable way forward for range, time-aloft or size?

[s1artibartfast]

Repeating my post above:

Given the line of sight limitation for drones, gas power does not add much value. Batteries are usually sufficient to map/photograph the area within range of the operator. Given this legal limitation, it is often more economical to hire a small plane like a Cessna with an avionics package and a 400 mi range.

[guelo]

Nobody wants to risk the liability and noise of a flying lawnmower.

[buran]

And then use it for what?

They exist, but they are expensive. https://www.youtube.com/watch?v=wS0Hr2lw604