A failing e-bike battery doesn’t always mean a new one. We break down when a £75 BMS replacement fixes it, when a cell group repair makes sense, and when replacement genuinely is cheaper — with real pricing by voltage from our Cardiff workshop.
3–5 years or 500–800 cycles is the textbook answer — but the real question is knowing when yours is actually done. How we test remaining capacity on the bench, and when to replace vs repair.
Guides • Batteries • Buying Advice Triangle vs Downtube eBike Battery: Which Should You Choose? By George — Qualified Mechanic & eBike Specialist, All4eBikes Cardiff
Guides • Batteries • Safety How to Charge Your eBike Lithium Battery Safely: The Complete Guide By George — Qualified Mechanic & eBike Specialist, All4eBikes
E-bike battery fully charged but not working? Step-by-step guide to BMS resets, blown fuses, loose connections, controller faults and when to replace your pack.
Charging a UK e-bike costs just 9p–37p per full charge. See exact costs by battery size, current Ofgem rates, charging times and tips to cut your bill further.
Not sure which battery voltage is right for your build? We break down 36V, 48V, 52V and 72V e-bike batteries — covering range, compatibility, and which voltage suits your motor. Browse all batteries →
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Pick your voltage, capacity, cells, connector — even a custom shape.
