1, generally two years after the battery will appear unchanged lamp phenomenon, the charger light is conditional, the current is as small as 300 ma, if the battery loses too much water, it will cause the current does not drop, it will not change, add water to the battery or replace the battery.
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2, the charger is broken, or there is a problem with the charger design, change a charger to try, or use the charger to charge a new battery.