Quick Answer: For a genuine long-range e-bike that can do 50+ miles reliably, most riders need roughly 700–900 Wh of battery. Shorter commutes under 25 miles can get away with 500–600 Wh, and true 70+ mile trips push you toward 900 Wh and up. But the battery size is only half the answer — your rider weight, terrain, tire width, and how much you use throttle or high assist decide whether you actually see those miles.
Start with battery size, in watt-hours
The single most useful number on a long-range e-bike spec sheet is the battery capacity in watt-hours (Wh). Wh tells you the size of the energy tank, and unlike "up to 80 miles" marketing claims, it is honest and comparable across bikes.
How Wh is calculated
Wh = volts × amp-hours (Ah). A 48V 14Ah pack is 672Wh. A 48V 20Ah pack is 960Wh. When a brand only lists Ah, multiply by the voltage to get Wh before comparing.
If you want the deeper explanation of what Wh means and why it beats marketing range, read our battery Wh explainer. This page is the practical sizing question: given how you ride, how big should that tank be?
The sizing rule, by trip length and riding style
Use your one-way trip distance and how you ride to find your starting Wh. These are practical bands, not promises — adjust up for hills, weight, and throttle.
| Your typical ride | Efficient riding (pedal-assist, flat) | Mixed real-world riding | Heavy use (throttle, hills, load) |
|---|---|---|---|
| Short commute (under 25 mi) | 500–550 Wh | 500–600 Wh | 624 Wh+ |
| Medium (25–40 mi) | 600–672 Wh | 672–720 Wh | 840 Wh+ |
| Long range (40–55 mi) | 720–840 Wh | 840–900 Wh | 960 Wh+ or a spare pack |
| Touring (55+ mi) | 900 Wh+ | 960–1,200 Wh | Dual-battery or a recharge plan |
Notice the columns spread as riding gets harder. The same 672Wh pack that comfortably handles a flat 35-mile pedal-assist ride might only deliver 25 miles when you add hills, a heavy rider, and throttle. Plan for the right-hand column if reliability matters.
What actually shrinks your real-world range
The gap between a marketing claim and your actual miles comes from a handful of predictable factors. Know which apply to you before you size the battery.
Rider weight & cargo
Every extra pound the motor has to move costs energy. A 230 lb rider with panniers draws noticeably more than a 160 lb rider on the same route.
Hills & stop-start
Climbing and repeated acceleration from stops are the biggest single range killers. Flat cruising sips power; a hilly commute gulps it.
Throttle & high assist
Throttle-only riding and top assist levels drain the pack far faster than moderate pedal assist. A torque sensor helps here — see our sensor guide.
Tire width and pressure matter too: fat tires look great and ride plush, but their rolling resistance quietly removes miles. If long range is the priority, favor narrower, higher-pressure tires.
A real example: 672Wh in practice
A concrete number helps calibrate expectations. The Velotric Discover 2 carries a 672Wh battery and advertises a range of up to 60 miles. Based on the battery math above and stated specs, a more conservative estimate is 35–45 miles on a single charge — roughly 60–75 percent of the marketing number, exactly the haircut the table above predicts for mixed real-world riding on a 750W bike.
That is not a flaw in the bike; it is how battery math works in the real world. A 672Wh pack is a solid medium-trip battery (25–40 miles), not a 60-mile one, once you account for a real rider, real terrain, and real assist use. If you genuinely need 60 miles, the sizing rule points you to 840 Wh and above.
- If the brand claims 50+ miles from a 500–550 Wh pack: assume that figure depends on a light rider, low assist, flat ground, and favorable weather — plan for roughly half of it.
- If two bikes cost about the same: the one with the bigger battery (Wh) is usually the better long-range buy, all else equal.
- If range is critical: size the battery for your hard-use column, not your best-case column.
The one-line decision rule
Take your realistic one-way trip in miles, double it, and match it to a Wh band in the table — then move one column to the right for every real-world factor (hills, weight, throttle) that applies to you. Buy the battery that lands there, and treat the marketing range as a best-case ceiling, not a promise.
For long-range candidates sized against this rule, start with our long-range e-bike collection and check each bike's Wh before its advertised miles.
Frequently Asked Questions
Q: How much battery (Wh) do I need for a 50-mile e-bike ride?
A: For most riders, 700 to 900 Wh is the realistic starting point. Heavier riders, throttle use, hills, and fat tires push the requirement higher. A 500–550 Wh pack is short-commute territory, not long-range.
Q: Is a bigger battery always better for range?
A: A bigger battery gives more potential range, but efficiency matters just as much. Tire width, bike weight, motor size, sensor type, and how much you pedal all change how many miles you actually get from a given pack.
Q: Why does my e-bike get fewer miles than the advertised range?
A: Advertised range is usually measured with a light rider, low assist, flat terrain, and mild weather. Real riding with hills, stop-start traffic, higher assist, and a heavier rider typically returns 50 to 70 percent of the marketing number.