E-bike batteries & replacement batteries compared
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The battery is the most expensive wear part on an e-bike. Compare replacement batteries here and learn how to recognise a battery that fits and is safe.
What you need to know before buying
E-bike batteries are not interchangeable. Three things are decisive: the voltage (usually 36 V or 48 V – it must match the motor exactly), the design with mount and connector (frame, down tube or rack battery) and communication with the drive system. Brand systems such as Bosch, Shimano, Yamaha or Panasonic recognise their batteries electronically – a third-party battery often won't work there, or only with restrictions.
You can usually increase the capacity (Ah or Wh) at the same voltage and with a compatible system; that extends the range but makes the battery bigger and heavier.
Safety: original or copy?
Lithium-ion batteries store a lot of energy. A poorly made battery with inferior cells or no battery management system (BMS) can overheat and, in the worst case, catch fire. Original batteries from the manufacturer or tested replacements from reputable suppliers with test certification (e.g. UN 38.3 for transport) are therefore the safer choice.
- Only use the matching charger
- Don't charge unattended overnight, ideally on a non-flammable surface
- Take damaged or swollen batteries out of use immediately
- Modified or “upgraded” batteries can cost you your warranty and insurance cover
Repair or dispose of an old battery?
Some specialist workshops offer to refit old batteries with new cells (cell replacement). This is often cheaper than buying new and saves resources, but should only be done by specialist workshops. Faulty batteries don't belong in household waste: retailers that sell batteries and municipal recycling centres take them back free of charge. Tape over the contacts before transporting them.
Finding the right battery – how to go about it
Note down the details on your old battery's rating plate: manufacturer, model designation, voltage, capacity and design. With this information you can find the matching original battery or a compatible replacement. If you're unsure, ask the bike manufacturer or a specialist workshop – the wrong battery is not just annoying, it can also damage the motor and controller.
Transporting batteries
When shipped, e-bike batteries count as dangerous goods. So only send an old battery via services approved for this, or hand it in directly at a retailer.