Batteries don't die suddenly — they fade. Here's how to recognize the fade, confirm it's the battery, and decide what to do.
How long do e-bike batteries last?
Expect 500–1,000 full charge cycles before capacity drops to ~70–80% of original — typically 3–5 years of regular riding. Partial charges are gentler than full ones, so real-world life often beats the cycle rating.
Signs yours is fading: noticeably shorter range on the same routes, the battery dying suddenly from 30% to zero, or swelling/deformation (stop using it immediately if swollen — that's a fire risk). Replacement batteries run $300–$800 depending on capacity and brand; proprietary systems cost more and can become unavailable if the brand folds — another reason to buy from established companies.
When it's done, don't trash it. Lithium batteries are hazardous waste. Bike shops, Call2Recycle locations, and many municipalities take them for proper recycling.
Confirm it's the battery
Range loss has many causes — rule these out first: underinflated tires, dragging brakes, colder weather, higher assist use, and added weight. If range dropped suddenly on the same routes in the same conditions, suspect the battery. A bike shop can often test capacity directly.
Frequently asked questions
How much does an e-bike battery replacement cost?
$300–800 typically. Proprietary systems cost more. Get the exact part number from your manufacturer before shopping.
