Short answer: 3–5 years or 500–1,000 cycles for most riders. Long answer: it depends enormously on how you treat it. Here's the complete picture.
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.
Replacement cost reality
Budget $300–800 for a replacement, depending on capacity and brand. Proprietary systems (Bosch, Shimano, Specialized) cost more — and can become unavailable if the brand discontinues the platform. This is a genuine argument for buying from established brands with long platform commitments.
Maximizing lifespan
The 80/20: charge 20–80%, avoid heat, store at half charge, use the stock charger. Riders who do just these four things routinely see 5+ years.
Frequently asked questions
Is it worth replacing the battery or buying a new bike?
If the bike is otherwise solid and the replacement is under ~40% of a new bike's cost, replace. If the bike is 5+ years old with worn components, put the money toward new.
Can e-bike batteries be repaired?
Some third-party services rebuild packs (replacing cells), but it voids warranties and quality varies. For most riders, OEM replacement is the safer path.
