E-bike batteries
The battery supplies the whole range of an e-bike, so it is chosen on the system voltage and on the connector, not on the price per amp hour. The real energy store comes out of the watt hours, that is voltage times capacity, and 48 V with 31.5 Ah gives 1512 Wh. It is charged only with the supplied charger, on a non-flammable surface and never below freezing. Over the winter it is stored about half charged, not run down to nothing.
E-bike batteries
The battery is the most expensive part on an e-bike and at the same time the one that decides how far you get. The category covers frame and rack batteries, sets in a bag and Hailong-type cases with 18650 and 21700 cells, mostly with a charger in the box. What sells most are the 36 V and 48 V voltages, because the conversion kits with Bafang motors are built around them. The old battery does not go in the bin, it goes to a collection point that takes spent cells.
The first thing that has to match is the voltage and the connector, because a 36V battery will not start the bike on a 48V controller and the other way round it burns it out. The connector is usually T-plug, XT60 or Anderson, and you do not move between types without soldering. A battery in a Hailong case needs a rail on the frame with the right bolt spacing, while the bag one straps almost anywhere. On a conversion to a Bafang BBS02 or BBSHD, check how many amps the controller draws so the battery can take it.
Range is not worked out from amp hours but from watt hours, that is from the voltage multiplied by the capacity. A battery of 36 V and 10 Ah holds 360 Wh, while one of 48 V and 31.5 Ah holds 1512 Wh, more than four times as much. An e-bike uses roughly 10 to 20 Wh per kilometre, depending on the terrain, the rider's weight and how much you pedal yourself. From that, 360 Wh covers 20 to 35 kilometres, while 1512 Wh covers a whole day.
Charging belongs on a non-flammable surface, in sight and clear of the escape route from the flat. Use only a charger with the same voltage and the same connector, because a 48V charger destroys a 36V battery in a single night. Below freezing, lithium cells must not be charged, metal builds up inside and the capacity drops for good. A battery that is swollen, dented or smells must not be charged at all, take it to the collection point.
Storage and transport have rules of their own, different from ordinary electronics. Over the winter the battery sits about half charged and dry at around ten to twenty degrees, because run down to nothing it is ruined within a few months. Batteries over 160 Wh are not allowed on a plane even in the cabin, and since January 2026 shipments go out charged to thirty per cent at most, so a new battery arrives almost empty.
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