Brompton Electric - Greenway 345 kWh Battery - for C, P and G Line Electric

The Brompton Electric Greenway battery is the power unit for Brompton's range of electric folding bikes across the C, P and G line models. This 345Wh battery slots into Brompton's compact folding frame design, keeping the bike portable while adding electric assistance for urban commuting and mixed-terrain riding. It's compatible with the G line bag system or works with P and C line bags when used with the adapter frame, so it integrates into whatever carrying setup you already have.

Built to Brompton's standards for British-made steel folding bikes, the battery maintains the spirit of the brand's original concept: a practical, foldable commuter that doesn't sacrifice everyday usability for the sake of going electric. The 345Wh capacity sits in the middle ground for folding e-bikes, offering genuine assistance without adding excessive weight or bulk to the already-compact fold. In typical urban riding, you'll get a realistic range that covers most daily commutes without needing to charge midway through the week.

The battery works across Brompton's electric drivetrain system, which means it's integrated into the bike's existing geometry and fold rather than bolted on as an afterthought. This keeps the overall package balanced and means the bike still folds down to a size that's genuinely portable—something that matters if you're genuinely going to carry it onto trains or store it in a small flat. The Greenway branding reflects Brompton's focus on practical urban transport rather than high-performance e-biking.

This battery suits anyone who already knows how Brompton's folding bikes work and wants electric assistance without losing portability. It's aimed at commuters who need a bike that's genuinely packable but want the motor support for London hills or tired legs on the way home.