To recharge in an hour would require a recharge rate of the order of 40 kW. Could be quite a challenge to provide power at that rate
No...It's voltage-dependent.
A car starter-motor can draw a couple of KW for a few moments....but it's normally at 12V........likewise, a welding plant can be fed off a 13-amp socket , but produce ~200 amps welding current.
I don't see a problem with interchangeable battery-packs, it's a whole new ballgame, so presumably the desk-jockeys have a whole new raft of regulations to dream up.