When you are on the go, you need batteries that remain powered and work throughout the day. The Energizer Mini Charger 2xAAAis a charge for batteries. You can fully charge your batteries the night before you leave your house. You can carry this mini charge with you. If you use your battery-operated devices each day for long durations, a battery charger is a good investment for you. Once the mini charger has charged your batteries, its battery indicator will go from red to green. You can leave your batteries in it overnight without worrying about them overcharging, as the mini charger will turn off automatically.