Problem Description
Battery charger does not respond when plugged in, it always shows a green light.
User Self-Diagnosis: Causes and Solutions
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Battery Fully Charged
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If the battery is already fully charged, you may need to wait for a while before attempting to charge it again. If the problem persists, you might need to replace the battery.
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Charger Malfunction
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Wall Outlet Fault
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Test the wall outlet into which the battery charger is plugged for any faults.
If you determine that the wall outlet has no power, its circuit breaker may have tripped or the wall outlet may be faulty and needs to be replaced.
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Customer Support
If you still have questions, please contact GKB Customer Service service_aftersale@geekbuying.com.
For Engineers
Cause Analysis
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Charger Port Fault
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Electric scooters, bicycles, go-karts, and other similar electric vehicles use “smart” chargers that automatically detect the condition of the battery or battery pack and, for safety reasons, do not charge batteries or battery packs that are over-discharged, internally short-circuited or open-circuited, have abnormal voltages, are sulfated, have reversed wiring polarity, or have other faults.
In any of these cases, the charger’s indicator light will remain green, will not turn red, and the charger will not charge the battery pack.
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Fault in the Wiring, Connectors, or Fuses Between the Charger Port and Controller
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Fault in the Battery Pack Harness or Connectors
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Blown Fuse in the Battery Pack Harness
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Battery Pack Fault
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Fault in the Charger Output Plug
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Charger Fault
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Solutions
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Check if the Charger Light Turns Red When the Charger Is Plugged into Both the Vehicle and the Wall
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Plug the charger into the vehicle and connect it to a wall outlet.
If the charger indicator light shows red, it indicates that the battery is charging.
If the indicator light remains green, it means the battery is already fully charged, or the charger is not receiving voltage from the battery pack, or the battery is faulty (such as being over-discharged).
Smart chargers automatically detect the battery status and will not charge if they detect a safety risk (such as over-discharge, short circuit, abnormal voltage, etc.). In such cases, the charger indicator light will remain green, will not turn red, and will not charge the battery pack.
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Testing Battery or Battery Pack Voltage
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If the battery pack is over-discharged, the battery charger will detect this situation and, for safety reasons, will not charge the battery pack.
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Test the Battery Charger
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Test if the Polarity of the Charger Port Terminals and the Charger Plug Terminals Is the Same
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To test if the output terminals of the battery charger and the charger port terminals have the same polarity, plug the battery charger into the charger port and then into the wall outlet.
Next, test the backside of the charger port to confirm that the terminal with the red wire is positive and the terminal with the black wire is negative.
If you cannot directly access the backside of the charger port, you can disconnect the main output wires from the battery or battery pack and perform the same test on these wires.
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Wrap the sides of the metal probes with electrical tape or install heat shrink tubing, leaving only the tips exposed.
Be careful not to touch the probe tips to both the terminal pins and the sides of the metal connector at the same time.
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