Be charged and ready to go with La Crosse Technology's BC500 portable battery charger. Optimum simultaneous charging of AA & AAA batteries with separate cell display. Charges at a rate of 500mA and won't overcharge, as the LCD displays voltage, charging current, charging percentage, and cumulative capacity for each cell compartment with simple one button operation. Also, detects a defective battery from charging and works with all NiCd & NiMH AA and AAA rechargeable batteries. With a maximum performance, it also includes 2 AA rechargeable batteries, AC/DC adapter and car adapter for when you're on the go.