A charger light that flashes red and green does not have one universal meaning. On one charger it may signal a connection problem; on another it may indicate temperature protection, standby behavior, or a fault. Do not borrow a light-code explanation from a different brand and treat it as a diagnosis.
Start by recording the exact pattern, then make only external checks. If the charger, battery, plug, or port shows heat, damage, odor, swelling, liquid, or sparking, unplug it if you can do so safely and stop testing.
Identify the Exact Charger Before Interpreting the Light
Read the label on the charger and confirm that it belongs with the battery you are trying to charge. A connector can fit while the charger is still electrically incompatible. If the original charger is unavailable, use only a replacement the bike or battery manufacturer has approved for that exact system.
Check the matching manual for its indicator-light table. Red, green, and alternating patterns are manufacturer-specific, so the manual is more useful than a forum answer about a charger that merely looks similar.
Record the Pattern Before Unplugging Everything
Take a short video that shows the complete flashing rhythm. Note whether the pattern appears with the battery disconnected, begins only after connection, or starts after charging has run for a while. Record the battery level shown on the bike, the room temperature, and any recent rain exposure, long storage period, drop, or impact.
These details help support distinguish a charger-side issue from a battery connection or temperature condition. The e-bike problem documentation guide shows how to organize the evidence without turning the rider into a repair technician.
Make Only Safe External Checks
With the system unplugged, inspect the charger cable, plug, battery port, and visible contacts. Look for debris, moisture, bent parts, discoloration, or a connection that will not seat normally. Do not insert metal tools into a port, force a connector, open the charger case, or remove the battery housing.
If everything is dry and undamaged, follow the manufacturer-specified connection order and try the approved charger once from a known working wall outlet. Do not keep reconnecting it if the same unexplained flashing returns.
Stop When the Light Is Paired With Another Symptom
Unusual heat, a burnt or chemical smell, buzzing, crackling, smoke, swelling, leaking, sparks, or a scorched port changes the situation from an indicator question to a safety problem. Stop charging, keep people away, and follow local emergency guidance if there is smoke or fire.
If the light flashes but nothing else appears abnormal, leave the charger and battery unopened and contact support with the video, labels, connection sequence, and battery status. That is usually more useful than testing with an unapproved charger.
Do Not Generalize the Answer Across Bikes
Different electric bikes use different batteries, charging systems, and indicator logic. The right answer comes from the exact charger manual and the symptoms around the light, not from the colors alone.
