The Energizer Maxi Charger is an exceptional everyday battery charger for all your essential devices. The improved Energizer Maxi Charger features easily identifiable color changing lights that show consumers straight away where their AA and AAA batteries are in the charging process. - Energizer Rechargeable The #1 selling rechargeable battery brand in the world (based on scan data) - It charges up to four AA or AAA batteries overnight - Its charge-status indicator tells you when batteries are charging - Its automatic timer shut-off mechanism at 11 hours means you avoid overcharging - Its powered from the mains - The Energizer Maxi Charger is also Energy Star Certified