Rechargeable batteries will work anywhere that disposable batteries work.
Although they seem cheap, the cost of disposable AA and AAA batteries adds up quickly when you consider all of the devices that they are used in and how quickly they are spent. Rechargeable batteries present a viable alternative. They can be reused hundreds of times and are easy to recharge. Panasonic's BQ390A charger recharges AA or AAA Nickel Metal Hydride or Nickel Cadmium batteries in about an hour per battery.
Instructions
1. Read the labels on your AA or AAA batteries. Verify that they say either Nickel Metal Hydride, Ni-MH or Ni-Cd. This charger is only designed to work with Nickel Metal Hydride or Nickel Cadmium batteries.
2. Load the batteries into the proper slots. The charger supports up to four AA batteries or two AAA batteries. Alternately, it can support two AA batteries and one AAA battery. Load up to four AA batteries into the largest slots. Load AAA batteries into the two smaller slots in between the first and second, and third and fourth slots. If you are using a AAA charging slot, do not load batteries into the AA slot on either side of the AAA slot. All of the batteries should be loaded with their positive terminals pointing toward the top of the charger.
3. Rotate the AC plug at the back of the unit out of its storage space. Plug the charger into a standard American wall socket with a 110 - 120 volt alternating current.
4. Look at the charging indicator light on the front of the unit. A blinking light indicates that the charger is working. If the light is not blinking, ensure that the batteries are properly contacting the metal connectors in the battery slot. If the light still does not come on, verify that your wall outlet is working.
5. Wait for the indicator light to turn into a steady green light. This indicates that the batteries are fully charged. Unplug the charger and remove the batteries. Charging will take approximately 135 minutes for one or two high-capacity AA batteries and approximately 115 minutes for one or two high-capacity AAA batteries.
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