Dunno how long it'd take to swap out a battery pack, but it's still not going to be as fast as chucking 10 gallons in - you won't be able to do it yourself unless you have the strength of the Hulk, so it'll be waiting till Torchy the Battery Boy (showing my age there...) becomes available with his modified forklift to lift the old ones out and the new ones in. And that's assuming they've got a fully-charged set available, which might not be the case if it's a Bank Holiday/start of school hols and they've had lots of customers...

Nope, still not convinced by the "electric revolution" yet. Not saying it won't get there, but it's a good way off still, I reckon.