JC Decaux in Dublin has user-swappable batteries for its city bike scheme. You rent the battery, charge it at home, and use it in one of their electric-capable

JC Decaux in Dublin has user-swappable batteries for its city bike scheme. You rent the battery, charge it at home, and use it in one of their electric-capable bikes. The battery weighs 500g and has a range of about 8km, which is more than the distance between the two furthest stations. Users who don't pay for the battery can use the electric bikes too, interchangeably with their non-electric push bikes. I thought this was a brilliant idea and implementation, but it hasn't been all that popular and there was a safety recall of the batteries at one point.