An Energizer AA 15-minute battery charger is a great way to charge your nickel metal hydride (NiMH) batteries quickly and it can also charge AAA batteries simultaneously. It's simple to use; just put your batteries in the charger, plug in the AC adaptor and turn it on. You get a red light telling you the batteries are charging, which turns green when they are charged. However, if you get a flashing red light, you need to troubleshoot the problem.
Turn off the battery charger by removing the plug from the socket on the charger. Remove the AA NiMH batteries from the Energizer 15-minute battery charger.
Wipe the battery terminals using a soft clean cloth and then wipe the terminal contacts in the 15-minute Energizer battery charger. If the battery or charger terminals are dirty, they can't make contact and your batteries won't charge.
Insert the AA NiMH batteries into the Energizer charger. Ensure you put the batteries in correctly. The "+" terminals on the battery need to connect to the corresponding "+" on the terminals in the charger, and the "-" need to do the same. Putting the batteries in the wrong way means they can't charge.
Insert the AC adaptor plug into the charger socket and turn on the charger. The red light illuminates to indicate your batteries are charging. If it flashes red, one or more of the AA NiMH batteries is defective, so try alternating different NiMH batteries in the charger to find which ones are defective. If the light continues to flash after putting in new batteries, you need to get the charger checked out professionally.
The Energizer 15-minute battery charger is designed specifically for NiMH rechargeable batteries. Don't put other battery types in the charger, as it can damage the charger and may result in your batteries exploding.