Remove at least one of the batteries and the light will go off. The red light remains on when the charger is unplugged. Leave the batteries in the charger, while the light continues to blink red, for about 24 hours. If the light blinks red in about 90 seconds after battery insertion, then the battery voltage is too low. If charging is needed, briefly drain the batteries before trying again. This indicates that the battery already have a full charge. ![]() The other possibility is that the batteries are actually charged but. This could be because the charger is defective, or because the batteries are damaged and need to be replaced. The first thing is that the charger is not outputting enough power to charge the batteries. There are several ways to restore batteries that cannot be charged by the charger.If the light blinks red within five seconds after battery insertion, then the battery voltage is too high. A flashing red light on a battery charger usually means one of two things. Occasionally, the charger might show blinking red right to indicate bad batteries. Rescuing “bad batteries” indicated by a blinking red light. The charger has a built-in converter circuitry that will become warm during rapid charging. ![]() It is normal for the charger to become warm while rapid charging. This does not mean the batteries are charged faster than others or overcharged The two batteries will become warmer than the other batteries due to heat generated by a converter circuitry in the charger. Flashing red light I use this charger/batteries only for my wireless mouse which takes two AA batteries. It is normal for the two rear batteries to become warmer than the other banks. Failed and destroyed my rechargeable batteries.
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