Iam using Energizer 15min charger. I have used for a longer time. Now the charger red light blinks while trying to re-charge batteries. I have tried various batteries but red light blinks. Failed to charge even on trying charge new batteries. Do the problem is with the charger?

Either batteries are no longer able to take a charge or charger is broken.

It could be possible that 1 of your 2300 mAh AA battery is defective.
Try to charge only 2 2300 mAh batteries at a time to see if it can charge.

MStrong The charger will not charge batteries that are reading that low Replace the batteries and try the charger again. Remember to always charge before use and never charge longer than 12-16 hours. Get into the habit of charging overnite on scooters used everyday and once a week on seldomly used scooters always sore the scooter fully charged and if storing for a longer time remove the batteries and store fully charged. ope this helps you

When the charger light is changing from red to green that is a indication that it is charging the battery. When the charge is complete the light will stay green until the battery is removed or the charger is unplugged.

Try a new or other charger, problem may be with the charger.

all chargers show a light of some colour when charging , green or red , depending on make of charger , when the battery is fully charged the unit monitor this and automatically switch of to stop from over charging , a safety feature that has to built in for safety reasons ,

When the duracell lights blink during charging, AT YOUR OWN RISK, try a reverse charge. Instead charging positive to positive and negative to negative, try positive to negative and negative to positive. I did this for 2 minutes. This solved the problem. After the 2 minutes, I gave the batteries a normal charge. You will have to force the battery and charger contacts to touch.

A flashing red light indicates that there's an error, or the batteries are defective.

No, the unit won't switch itself off once the batteries have been fully charged. The unit will start trickle charging instead.

I just used the Duracell charger without a problem. I have not tried to charge an Energizer and Duracell at the same time and I don't recommend it unless someone who has tried says otherwise!