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freeone3000 | karma 6828 | avg karma 2.71 · 2021-04-23 20:21:48+00:00

You get the uncharged battery back, though, which you can then charge and give to another person. It's like a propane cylinder swap.

tln | karma 1235 | avg karma 2.39 · 2021-04-23 22:34:15+00:00

...just 500 times more expensive.

Propane capacity isn't going to go down as the tanks age; losing 10% when swapping in an older battery could really suck.