There is no fixed service life for lithium batteries of electric bikes. The key is to check the degradation status rather than the service years. For regular lithium batteries used for commuting, the service life is generally 3–5 years, and lithium iron phosphate batteries can last longer. It is time to consider replacement when you encounter shortened range, weak acceleration and abnormal heating.

How Many Years Can a Lithium Battery Last?

Battery life is calculated by cycle times.

Estimated service life = Rated cycle times ÷ Annual full cycles

Reference data:

• Lithium iron phosphate (LFP): over 2000 cycles, some up to 3500 cycles
• Ternary lithium battery: 1000–2000 cycles
• Lead-acid battery: 300–500 cycles

Example: Commuter charging once every two days, around 180 cycles per year

• LFP: about 10 years
• Ternary lithium: about 5–6 years
• Lead-acid: obvious degradation after 1–3 years

For delivery riders with 1–2 cycles per day, the service life will be roughly halved.

5 Warning Signs That The Battery Needs Replacement

✅ Replace as scheduled

1. Obviously reduced driving range: capacity drops by about 30%
2. Charging finishes quickly but runs for a short time: available capacity decreases
3. Weak acceleration & power drop when climbing: increased internal resistance limits high-current output

⚠️ Replace immediately (safety hazard) 4. Swollen battery, liquid leakage or abnormal heating: risk of thermal runaway, stop using right away 5. Severe self-discharge: power drops sharply after full charge overnight, the cell is likely damaged

What Is the End-of-Life Standard?

Industry standard: The battery reaches end-of-life when capacity drops to 80% of the original value.

• Below 80%: faster degradation, poor cell consistency and reduced safety margin
• 85%–90% capacity: aged but still suitable for short-distance & low-load use
• Suggestion: Test actual range or check capacity at service store before making decisions.

Replace or Keep Using? Three Factors to Consider

1. Usage cost: Degraded battery brings range anxiety and extra time cost
2. Residual value: Old battery recycling & trade-in service available for discount
3. Safety risk: Using swollen or overheated batteries is dangerous

Conclusion: For commuter batteries below 80% capacity, it is usually not cost-effective to keep using.

3 Inspection Tips When Buying New Batteries

1. Check specifications and warranty: Confirm cycle life, capacity and warranty terms. Choose batteries with clear parameters and authoritative certifications.
2. Verify by weight: Ternary lithium ~5g/Wh, LFP ~7g/Wh. Unreasonably light weight usually means false capacity marking.
3. Buy from official channels: Purchase from official stores or authorized dealers, verify cell code and model, test capacity on receipt.

Second Life of Retired Batteries: Echelon Utilization

Retired lithium batteries with 70%-80% remaining capacity can be reused for energy storage and backup power supply. Brands with recycling programs can recycle old batteries, bringing residual value for users and reducing environmental pollution.

Conclusion: Battery life is calculated instead of guessed. Count your charging cycles and watch degradation signs, then you will know clearly whether to replace it.