How long does an e-bike battery really last?

Every e-bike comes with a "rated range" printed somewhere in the manual — 60 km, 80 km, sometimes more. In practice, almost nobody rides that far on a single charge. Here's what actually determines how far you'll get, and how to plan a trip without gambling on it.

What actually drains the battery

Manufacturers test range under close-to-ideal conditions: flat ground, moderate speed, a rider of average weight, mild temperature, and the lowest assist level. Change any one of those and the number moves.

• Elevation gain is the biggest factor by far. A route with 800m of climbing can use two to three times the energy of a flat one of the same length.
• Rider and cargo weight matters more than people expect — panniers, a rear rack, a second rider on a cargo bike, all add up.
• Assist level is the one you control directly. Riding in "eco" instead of "turbo" can easily double your range.
• Temperature affects the battery chemistry itself: cold weather can cut usable capacity by 20–30%, independent of how you ride.
• Wind is the factor nobody accounts for. A strong headwind does to your battery what a hill does.

A more honest way to estimate range

Rather than trusting the rated number, treat it as a best-case ceiling and plan for 50–70% of it on a real route with real elevation. If your bike is rated for 80 km, plan your day around 40–55 km between charges — more if the terrain is flat, less if it isn't.

Why charging stops matter more than battery size

A bigger battery helps, but it doesn't remove the need to know where you can top up. A short 30–60 minute charge at a café, campsite, or bike-friendly stop can be enough to cover the return leg of a day trip — you don't need a full charge, just enough.

That's the gap Watt2Ride is built to close: a map of real places where you can plug in along the way, not just official charging stations, so you can plan a route around your actual range instead of the number on the box.