Should be the charger fault, the common charger current limiting resistance burned out, the charger charging will appear alternating flashing traffic lights and charger fan does not turn phenomenon, change a charger can solve the problem.
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It should be noted that when replacing the charger, the positive and negative poles of the output line of the new charger and the old charger must be consistent.
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There are several reasons why the charger flashes red and green together
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1, the charger red light but not flashing, charged overnight or red light, this situation shows that the charger is powered. But the battery is not charging, there are two reasons, one is the battery charging plug is broken, line failure and other physical reasons. The other is that the battery itself has been vulcanized, and the increase in internal resistance leads to the electric vehicle battery not being charged, or it is fed.
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2, the charger red light has been flashing, charged for a long time the red light does not flash, but the green light is not bright. In this case, either the green light of the charger is broken, or the battery is overcharged and damaged, and you need to find the same model of charger to verify it again to determine which is broken.
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3, the charger red light flashing green light also flashing this indicates that the battery has been placed for a period of time has not been used, the battery has electricity, may be virtual electricity. At this point you just need to wait for a moment, the current up the green light will be extinguished.