Duracell hi speed advanced battery charger 15 minutes of charge up to 4 hours of use charging aa batteries results vary by device usage pattern this charger needs 45 minutes to fully charge 2 aa batteries approx 85 of charge with duracell 1300mah aa nimh batteries charges aa aaa sizes and comes with 10 year guarantee 4 x aa 4 x aaa charges batteries in pairs charge time 025 up to 075 hours 15 minutes charging indicators bad cell detection automatic timer cut off