What to Check Before Purchasing Used Electric Bicycle (Ultimate Guide)

[Alexander]

What to Check Before Purchasing Used Electric Bicycle (Ultimate Guide)

Buying a used e-bike is one way to save hundreds of pounds. However, because of all the extra moving parts and components that come along, purchasing second-hand e-bike requires careful inspection. You need to look not only at mechanical systems, but also at electrical parts and battery. Otherwise, it's possible that your bargain deal will turn out to be an expensive trap. Here is everything to inspect when buying a used electric bike.

Start From the Battery — The Most Expensive Part of the E-Bike

The battery is the main part of an e-bike and it often takes a lot of money to replace it. A new battery can cost you from **£300 up to £900**, depending on the brand.

How to check the battery condition

• - Find out the number of charge cycles.
• Typically, lithium-ion batteries can work for about 500-1,000 cycles until degradation.
• - See how long it holds the charge.
• If the seller claims that the range used to be 60 miles, while now it gives only 20, the battery has definitely degraded.
• - Make sure the battery doesn't have any deformities or signs of overheat.
• If you see swelling or cracks — that's a deal-breaker.
• - Ask whether the battery has been stored correctly.
• Batteries degrade quicker if left in full charge mode or completely discharged for too long.

What is a healthy battery?
- Holds the charge consistently, without sharp drops
- Doesn't generate excess heat during charging
- Has almost the same range as advertised by the manufacturer

Inspect the Motor for Noises and Vibrations​

Motor failures happen rarely but if something goes wrong, repairing it can take you a lot of money.

What to check on the motor?

• - Listen for sounds like clicks or grinding while driving.
• - Check for the smoothness of power transmission.
• - See if there are any error codes shown on the display.
• - Verify the brand (Shimano, Bosch, Yamaha or Bafang)

Hub motor or mid-drive?

• - Hub motors: simpler to fix and repair, less expensive
• - Mid-drive motors better performance going uphill, but more expensive to repair

Look for Damages in the Frame​

Cracked frame means immediate ban. There's no point in fixing such a bike.

Inspect thoroughly the following elements:

• - Welding joints
• - Bottom bracket
• - Head tube
• - Places where battery is mounted

Use torch to find hairline cracks and bubbling paint.

Check for Issues in the Electrical System and Cabling​

Badly connected wires can result in constant power loss or total breakdown.

Make sure you don't see:

• - Cracks
• - Frazed wires
• - Loose connectors
• - Signs of corrosion on terminals
• - Traces of water entering the bike (quite common in UK weather)

Turn on the bike and move the connectors slightly: does display flicker? If yes, that's definitely a problem.

Test Brakes, Drivetrain and Suspension​

Those are typical bike components, however, due to extra power produced by motor, additional stress is applied to them.

Brakes:

• - Ensure the disc hasn't deformed
• - Ensure even and powerful braking

Drivetrain:

• - Measure chain stretch
• - Inspect cassette for wear
• - Ensure smooth shifting

Suspension (if equipped):

• - There shouldn't be any oil leaking
• - There shouldn't be any play in suspension
• - Adjustments should function properly

Find Out About Mileage and Bike History​

Mileage affects both motors and batteries.

Ask the seller:

• - How many miles did the bike cover?
• - Is the bike used for daily commuting or just occasional rides?
• - Was it driven in rainy or salty conditions?

It's not necessarily bad that the bike had high mileage because low-mileage battery was not used for a long time can also be problematic.

Verify the State of Charger and Firmware​

No original charger is an alarming signal.

Verify:

• - Correct type of the charger
• - Normal connection to charging port
• - Whether the firmware is updated or not (for Bosch, Shimano or other brands)

Ask for Service Records and Documentation​

In case of a well-maintained bike there should be the following documents:
- Purchase invoice or receipt
- Service records
- Battery replacement records
- Warranty information (some brands offer warranties transferable)

Do a Proper Test-Ride​

Riding in circles nearby doesn't guarantee the full state of the machine.

During your test-drive check for:

• - Operation of different assist levels
• - Operation of throttle if present
• - Performance during ascending
• - Braking performance under load
• - Responsiveness of the display

Pay attention to any unusual noises or power fluctuations.

Evaluate Your Budget Depending on E-bike Condition​

The average cost of used e-bike is between 40-70% of the initial price of new bike depending on the following factors:

• - Battery life
• - Motor brand
• - Mileage
• - Bike age
• - Condition

If the battery is damaged, you have to negotiate very carefully. In many cases, battery replacement costs more than the discount.

List of items to bring when inspecting the e-bike

• - Torch
• - Tyre pressure gauge
• - Phone with the information about your bike (manufacturer specs)
• - Multimeter (optional, for professionals)
• - Notepad for writing error codes

Conclusion​

Second-hand electric bike purchase can be an economically sound decision — if you perform a careful examination of all the systems and parts. In particular, pay special attention to battery, motor and electrical systems as it may save you from unnecessary expenses.

 

[Justin]

I haven't bought a second hand ebike yet, the only ebike I have was bought brand new. I am nit a fan of buying used vehicles, including ebikes. But if someone wants to buy an ebike the most important thing to consider is battery performance.