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  • Brompton Electric Battery 300 watt (6734320435251)
  • Brompton Electric Battery 300 watt 3/4 turn with handle up (6734320435251)
  • Top of Brompton Electric Battery 300 watt, bag not included. (6734320435251)





We currently have more than 5 in stock.

Planning a long tour with your Brompton Electric bike? If you're covering tons of ground or your route doesn't allow for a lunchtime battery recharge at a coffee shop, you might want to bring an extra battery along for the ride.

The Brompton Electric Battery provides 300Wh of juice for your adventures. Charging from empty to full in just 4 hours, the battery has a minimal weight penalty of 5 lbs that can easily be carried in the City Bag Large or a backpack. A built-in USB port allows you to charge a phone or other small device while en route, and the LED lights on the top of the battery keep you informed about remaining power and assist setting.

The battery must be used in conjunction with the Essentials Bag or City Bag Large due to the internal frame and connection points integral to the bags. Due to its 300Wh power capacity it is not permitted on airplanes.

  • Genuine Brompton Accessories 
  • Battery for Brompton Electric bike
  • 300Wh power
  • Built-in USB port allows small device charging while en route
  • Must be used in conjunction with Brompton Essentials Bag or City Bag Large
  • Not permitted on airplanes
A BIT ABOUT BROMPTON: If you were to walk into the store and look at a Brompton we would say there are three things you should look for in a folding bike. All of them are fairly obvious. One, the bike should ride well - and, on a small wheeled bike that's tricky because there's a fine line between maneuverability (which is a virtue) and twitchiness (which is a vice). Two, the bike should fold well - otherwise you're blood pressure will rise and you'll curse the day you bought it. Third, it should be transportable, or highly storable - because that's the whole point, right?

Brompton is the only company we've seen that answers all three criteria - and believe us, we've tried every brand out there. The reason others can't compete is because Brompton has answered a fundamental engineering problem. If a bike is going to unfold to a large footprint (which takes the twitch out) then it is unfolding to a bigger bike - and by all logic, a bigger bike unfolded would be a bigger bike folded. So, it's pretty much true that for most folding bikes they either have great rideability but poor transportability or vice versa. And nearly all of them are a mess to fold.

Not Brompton. Brompton has designed the Platonic form of all folding bikes. The bike folds to the smallest size on the market, unfolds in a highly precise and easy manner, and has the same axle-to-axle footprint as a hybrid bike. How did they do this? By not only designing a clever frame, but also designing some 1200 proprietary parts that make everything fit - and fit perfectly. Oh, and nearly all of this is made in England. No wonder this bike has a cult following.


Canada: We use UPS, Purolator, Canpar or Canada Post within Canada. All applicable Provincial Taxes are charged at checkout. Orders may take 1-2 business days to process. A tracking number will be provided by email.

USA: We use UPS or Canada Post/USPS in the USA. No US or Canadian Tax is charged at checkout and all cross-border Fees and Duties are prepaid so there are no surprises. Orders may take 1-2 business days to process. A tracking number will be provided by email.

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