Electric bike battery life: how to estimate real kilometers (and extend the battery)
The number one question is always: "How many km do you ride?" The correct answer is: it depends on whey and the conditions.
1) What does Wh mean (and why is it more important than "voltage")
Wh (watt-hour) is the "useful capacity" used to compare batteries. Common examples:
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400 Wh (input)
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500 Wh (very common in the city)
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625–750 Wh (high, heavy use, cargo)
2) Factors that most reduce autonomy (real life)
Bosch explains that range depends on many factors and that low temperatures temporarily reduce performance ; it also points out that pedaling at an appropriate cadence improves efficiency.
In practice, the biggest "thieves" of autonomy are:
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long climbs + load
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Turbo mode always on
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flat tires
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strong wind
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cold
3) How to increase autonomy without spending money
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Keeps tires at the correct pressure.
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It uses an "eco/tour" mode most of the time.
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Pedal with a steady cadence (don't "crush" gears)
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Avoid sudden braking and aggressive acceleration.
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If possible, choose routes with less incline.
4) How to care for your battery to make it last longer
Simple best practices:
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Do not keep the battery at 100% all the time for extended periods (for storage, an intermediate level is best).
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Charge in a dry place, using a suitable charger.
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Avoid leaving it in extreme heat (e.g., car in the sun).
5) Do lights and safety features also impact range?
Lights consume little energy, but are essential for riding in low visibility conditions and are included in specific regulations for bicycles.
FAQ
Is the advertised autonomy realistic? It's possible under ideal conditions. For purchasing decisions, use "optimistic" as a benchmark and plan accordingly.
Do hills in Portugal significantly reduce range? Yes — so Wh and the right engine matter.
Is it worth buying a larger battery? If you drive uphill/travel long distances/charge frequently, almost always yes.