Electric bikes cost upwards of $2000, but if you are prepared to put one together yourself you can do it for a quarter of the price.
Auckland engineer, Stuart Harwood, did just that, building his own e-bike, which he gave to his girlfriend for her birthday.
Now he's sharing what he has learned at Pecha Kucha Auckland tomorrow night, so others can build their own bikes too.
Hopefully, that's enough time to learn the basics of making an ebike.
Stuart Harwood talks to Jesse Mulligan.