Problem description
The motor only runs when it is charging and does not work when the charger is unplugged.
User self-check: causes and solutions
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Cause Analysis
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Solution
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Circuit Design
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It is recommended to check whether the circuit connection of the electric scooter is normal and ensure the battery charger can be properly connected to the motor of the electric scooter when plugged in.
If the connection is normal but the motor still does not work, it may be that the controller or circuit board of the electric scooter is faulty. It is recommended to contact the manufacturer or maintenance professionals for inspection and repair.
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Battery Charger Problems
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Replace the battery charger with a new one.
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Customer support
If you still have questions, please contact GKB customer service: service_aftersale@geekbuying.com
For engineers
Cause analysis
- The battery pack has been over-discharged and the voltage level is below the controller’s low voltage cut-off level, and the battery charger cannot charge the battery pack.
- An old, worn, or faulty battery pack whose voltage drops to zero percent state of charge under load.
- There is a problem with the fuse, circuit breaker, wiring, connector, or other component between the battery pack and the controller.
Solution
Confirm charging record
Determine how long the battery pack has been uncharged. If it has been uncharged for less than 6 months, you may be able to successfully charge the battery pack.
If it has been uncharged for more than 6 months, the battery pack will usually self-discharge to a voltage level where it cannot be recharged and needs to be replaced.
Also, if the power switch is on for more than a few days, the battery pack will discharge to a voltage level where it cannot be recharged and needs to be replaced.
If the power switch has been on for more than a few days, or the battery pack has been sitting for a long time without being charged, the battery pack may be over-discharged and may need to be replaced.
Deep charging
Sometimes a lead-acid battery pack requires a deep charge to equalize the cells and help the pack regain capacity. Try charging the pack for 48 to 72 hours to see if that helps. A deep charge is recommended several times a year or when significant capacity loss is noticed.
Test the battery charger port
If the battery charger is plugged into the wall, unplug it. Plug the battery charger into the battery charger port on the electric scooter and see if the charger’s indicator light comes on. If the indicator light on the battery charger comes on, then the wiring and wiring connectors to the charger port are good, and the charger port itself is good. Not all battery chargers have an indicator light that comes on when the charger is just plugged into the vehicle, so if the light does not come on, you should do a secondary voltage test with a multimeter as described below.
If you have a multimeter, you can test the voltage at the battery charger port. The voltage level at the charging port should be the same as the voltage level of the battery pack. If the charger port has male terminals, you need to be very careful to avoid shorts between the terminals or in the charger port casing (if it is metal).
Test the battery charger
Make sure there is voltage at the charger port, then test the voltage of the battery or battery pack to confirm it needs charging.
Plug the battery charger into the charger port, plug into the wall, and use a digital multimeter to test the voltage of the battery pack.
If the voltage rises slowly, the charger is charging the battery. Continue charging until the indicator shows a full charge, then test the battery voltage to confirm it has reached 100% charge.
If the charger cannot charge to 100%, there may be a problem.
Test the battery pack
The batteries are load tested by removing the battery pack from the scooter and taking out the individual cells.
The individual battery can then be tested using a car battery load tester.
Most entry level car battery load testers place a 100 amp load on the battery which is too high, so an adjustable carbon stack battery load tester is required and should be adjusted to place a 30 amp load on the battery.
Test battery pack voltage
After reading the voltage, the Battery State of Charge Chart can be used to determine the percentage of state of charge.
A good battery or battery pack will have a voltage at 100% state of charge after it has been discharged and left for a few minutes, or if it has been stored. If the voltage does not rebound to 100% state of charge within a few minutes of the battery pack being discharged, this indicates a faulty or worn cell or battery pack.
When a battery pack has been charged to 100% state of charge and has been left for a period of time and its voltage drops below 100% state of charge, this indicates a faulty or worn battery pack.
Good batteries and battery packs will return to 100% state of charge within a few minutes of the vehicle being driven.
