Red light - Charging has started; audible beep when charging begins. Yellow light - Charging is 50% complete and charging. Green light - Charge is complete and batteries are 100% full; audible beep upon completion. Bad Battery Detection Alert - If a bad battery is detected a red ‘x’ will illuminate; repetitive audible beep upon detection. Complete charging in three hours or less for Energizer Universal Batteries.Energizer AccuRecharge Pro 1 Hour Battery Charger with 4x AA Batteries 639838
