How Far Will an E-Bike Go? Choosing the Right Battery Size for Your Rides

“How far will it go?” is the first question almost everyone asks when they’re looking at an electric bike, and it’s the one with the least helpful printed answer. The battery size on the spec sheet tells you how much energy you’re carrying, not how many miles you’ll get, so two people on the same bike can see very different results.

This guide is about everyday electric hybrids: the bikes people use for commuting, seafront rides, towpaths and weekend touring. We’ll explain what the numbers mean, show how battery sizes compare on bikes we list, and help you pick a size that suits your journeys rather than just buying the biggest one.

Watt-hours in plain English

E-bike batteries are measured in watt-hours (Wh). It’s simply the amount of energy the battery holds when full. A 600Wh battery holds half as much again as a 400Wh one, and an 800Wh battery holds twice as much.

How quickly you use that energy is the bit that changes. The motor only draws power when you’re pedalling, and how much it draws depends on how much help you ask for and how hard the ride is. Think of watt-hours as the size of the tank, and your riding as the fuel economy.

Why no one can promise you a mileage figure

Bosch, whose motors power most of the bikes in this guide, is refreshingly honest about this. In its eBike Battery Guide it says a single charge will sometimes take you less than 12 miles (20 km) and at other times much further than 62 miles (100 km). The things that make the difference are:

• Assist mode. Riding everywhere in Turbo uses far more energy than Eco or Tour.
• Total weight. You, the bike and anything in your panniers.
• Stop-start riding. Pulling away from junctions and lights costs more than cruising at a steady speed.
• Cadence and gears. Bosch notes that very slow pedalling in a high gear is costly in energy terms; spinning above about 50 rpm is more efficient.
• Tyre pressure, wind, hills and surface. A headwind along the sea wall or a soft gravel path both add up.
• Temperature. Batteries deliver less in the cold, so expect shorter range in winter.

For a personalised estimate, the free Bosch Range Assistant lets you enter your motor, battery, weight, terrain and riding mode. It’s the best tool we know for a realistic number, and we’re happy to run through it with you in the shop.

Five electric hybrids, four battery sizes

Here’s how battery size lines up on bikes we currently list. Specs and weights are from each manufacturer’s published information, and prices were correct at the time of writing.

Notice the trade-off: the two lightest bikes carry the smallest batteries, and roughly ten kilos separate the lightest from the heaviest. More battery means more range in reserve, but also more bike to lift, store and wheel around.

Matching battery size to your journeys

Around 360–400Wh: commuting and shorter rides

If your typical ride is a daily commute, a trip to the shops or an hour or two along the seafront, a smaller battery is usually plenty, especially if you charge regularly. You get a lighter, more natural-feeling bike that’s easier to carry up steps or onto a car rack.

The Trek FX+ 7 is the lightest bike here at 18.15kg fully equipped, with a quiet TQ motor, carbon fork, built-in lights and a 360Wh battery. It suits riders who want help on hills and into the wind but still want the bike to feel like a quick hybrid.

The Trek Verve+ 2 Gen 3 pairs a 400Wh Bosch CompactTube battery with a comfort-focused build: suspension fork and seatpost, wide tyres, mudguards, rack and lights. It’s a relaxed, upright bike for everyday riding.

For lighter touring, the Cube Kathmandu Hybrid C:62 Pro 400X uses a carbon frame, Bosch’s lightweight SX motor and a 400Wh battery, with an integrated rack, mudguards and lights, all at 18.4kg.

Around 600Wh: the all-rounder

A mid-size battery gives you a comfortable buffer for longer leisure rides, a few days of commuting between charges, or using the higher assist modes more often without watching the display.

The Cube Touring Hybrid ONE 600 combines a 600Wh Bosch PowerTube battery with the Performance Line motor, a 100mm suspension fork, Schwalbe Big Apple tyres, a carrier, full mudguards, lights and a kickstand. It’s one of the most sensible “do everything” e-bikes we list.

Around 800Wh: long days, heavy loads, no range worries

The biggest batteries make sense if you ride long distances, carry luggage, tackle hills regularly, or simply don’t want to think about charging. They also help in winter, when cold weather trims range.

The Cube Kathmandu Hybrid ONE 800 carries an 800Wh PowerTube battery and Bosch’s Performance Line CX motor (up to 120Nm), along with an air suspension fork, suspension seatpost, Shimano XT 12-speed gears and an integrated carrier. It’s built for big touring days.

You can browse every model in our electric hybrid bikes collection. If you’re planning to ride off-road, our guide to lightweight vs full-power e-MTBs covers that side of things.

Charging at home: removable or fixed battery?

Before you choose, think about where the bike will live. If it’s kept in a shed or garage without a socket, or you live in a flat, being able to take the battery inside to charge matters.

• Trek lists the FX+ 7’s battery as dealer-removable, so day to day you charge it on the bike.
• Cube lists the Kathmandu Hybrid C:62’s battery as fixed and integrated, so again you charge on the bike.
• For the other models, ask us and we’ll show you exactly how the battery comes out and how charging works.

It’s a small detail that makes a big difference to living with an e-bike, and it’s one of the most common things customers wish they’d asked about.

Getting the most from your battery through winter

Cold weather doesn’t damage a battery, but it does reduce how much it delivers. Bosch’s own advice in its battery guide is to keep the battery at room temperature in winter until shortly before a ride, and if you’re storing the bike for a longer period, to leave the battery at roughly 30–60% charge and recharge it after storage. Add correctly inflated tyres and a sensible assist mode, and you’ll get noticeably more from every charge.

Not sure which size you need? Talk it through with us

Tell us your usual ride, how often you can charge and where the bike will be stored, and we’ll help you find the right balance of battery, weight and price. We can run the range calculator with you and show you how each battery fits and charges.

Visit Les’s Cycles, 365 Long Road, Canvey Island, Essex SS8 0JQ, call 01268 695877 or email sales@lescycles.co.uk.