This Battery is smaller then AA Size. Please measure and compare and verify that it is written 14430 on the battery.You can replace this battery with capacities(mAh)that range from 200mAh till 600mAh. Specifications: Nominal Voltage: 3.2V Size: 4/5 AA (14430) Capacity: 400 mAh (Replaces 500mAh /350mAh / 300mAh / 250mAh and more) Chemistry: Lithium Phosphate (LiFePO4) Max Charging current: 0.4A Max Discharging current: 0.8A Energy density: 75.29wh/kg Brand: Blue Label Included Qty: 1 Dimensions: Length: 43.5 mm (1.72") Diameter: 14 mm (0.55") Weight: 17 g (0.6 Oz) Features: No memory effect Long storage life Light weight and high energy density Up to 2000 Charge Cycles Ideal for the following applications: Solar Lights Emergency Lights Custom Battery Packs