Battery Not Charging & Charger Stays GreenUpdated 14 days ago

Battery Not Charging — Charger Stays Green

Overview

This article helps you diagnose and fix an electric scooter battery that won’t charge while the charger LED stays green. It’s written for owners comfortable using a multimeter and removing the scooter’s bottom cover. Follow the steps to quickly identify whether the charger, charging port, or battery needs replacement.

Before You Begin

Have a digital multimeter (DC voltage and continuity functions).
Set of screwdrivers and a plastic pry tool (optional).
Static-safe workspace and a clean, well-lit area.
Charger and scooter model/spec information (printed on the charger or on the scooter decal).
Note: Opening the bottom cover does not void the warranty.

Step 1: Verify Charger Output

Check whether the charger is providing the correct voltage.

Unplug the charger from the scooter and from mains.
Set your multimeter to DC voltage (range above the charger rating).
Plug the charger into mains and carefully measure the output at the charger plug:
- Touch the meter probes to the charger plug terminals (observe correct polarity).
- Compare the measured voltage to the regulator specs printed on the charger label.
Record the reading.

💡 Tip: If the charger uses a barrel or proprietary connector, hold the connector steady and test gently to avoid shorting.

Step 2: Inspect the Scooter Charging Port (Bottom Cover)

Open the bottom cover and inspect the charging port for damage or loose connections.

Power off the scooter.
Place the scooter on a stable surface. Remove screws securing the bottom cover using the appropriate screwdriver.
Carefully remove the bottom cover and set it aside.
Visually inspect the charging port and surrounding wiring:
- Look for bent pins, corrosion, burn marks, melted plastic, or foreign debris.
- Check that the port’s connector is fully seated to the internal wiring harness.
If debris is present, gently clean with compressed air or a soft brush.

⚠️ Note: Avoid inserting metal objects into the port. If you see melted plastic or burn marks, do not attempt to use the charger again until the port is replaced.

Step 3: Test Charging Port Continuity and Wiring

Confirm the charging port and wiring are continuous to the battery/controller.

Set your multimeter to continuity mode (or low-resistance Ohms).
With the scooter powered off and the charger disconnected:
- Probe from the charging port terminals to the corresponding cable ends at the harness or to the battery/controller connector.
- Identify which terminal is positive and which is negative (label or photo beforehand).
A good circuit will show near-zero resistance or a beep on continuity.
If continuity fails on any terminal, trace the wiring for breaks, loose solder joints, or disconnected crimp pins.

💡 Tip: Take a photo before unplugging any connectors to keep orientation and wiring order correct when reassembling.

Step 4: Confirm Behaviour With Charger Connected

If the charger output is correct and port continuity is good, perform a live check.

Reconnect charger to the scooter while the multimeter measures voltage at the charging port terminals (scooter powered off).
The port should show the charger voltage you measured in Step 1.
If charger voltage is present at the port but the battery voltage does not change, the issue may be battery management system (BMS) or battery pack.

⚠️ Note: If the charger LED stays green but there’s no voltage at the port, the charger may be faulty or its cable/connector is damaged.

Verification

You should see the charger’s rated DC voltage at the charger plug (Step 1).
You should see the same charger voltage at the scooter charging port with the charger plugged in (Step 4).
Continuity check should show a closed circuit between the port and the battery/controller (Step 3).
If all checks pass and the battery still does not charge, the BMS or battery pack likely needs service.

Troubleshooting

Issue: Multimeter shows 0 V at the charger plug

Solution: Replace the charger. The charger is not producing output despite mains power.

Issue: Charger output OK, but no voltage at the scooter charging port

Solution:

Inspect the charger cable and connector for breaks or bent pins; replace charger cable or connector if damaged.
Check continuity between charger plug and charging port; repair or replace the charging port/wiring harness if continuity fails.
Refer to the specific charging-port replacement video for your model (see Resources).

Issue: Charging port shows voltage but scooter still won’t charge (battery not accepting charge)

Solution:

The BMS may be in protection mode or the battery pack may be faulty. Contact support.
Check battery voltage directly at the battery terminals (with appropriate safety precautions) to confirm state of charge.

Issue: Physical damage or melted connectors

Solution:

Replace the charging port assembly. Do not attempt to use the damaged port; it can create a safety hazard.

Resources

Video tutorials (helpful for accessing the charging port):

Note: Some battery-replacement videos show steps to access the charging port even if the title refers to battery replacement.

Still Need Help?

If the steps above don’t resolve the issue, contact our support team and include:

Scooter model and serial number
Charger label/specs and measured charger output (V)
Photos of the charging port and any visible damage
Results from continuity and voltage checks

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