Zero Motorcycles' electric bikes can be fun to ride, but recharging is another matter entirely. It's tough to wait hours when all you want to do is go back on the open road. That shouldn't be such a problem with the company's just-introduced 2018 models. If you use a 6kW Charge Tank accessory with the newest Zero S, SR, DS and DSR, you can charge up to six times faster -- as little as an hour for the S or DS ZF7.2 when you plug into an ordinary Level 1 outlet. Models with larger batteries can still top up in two hours if you use a Level 2 EV charger. Neither charging rate is as speedy as filling a gas tank, of course, but they're fast enough that you could come home with a low battery and head out again after dinner.