CatEye: Volt 400 Duplex Li-ion replacement cartridge battery with integral rear LEDRuntimes when used instead of standard cartridge battery with Volt 300, Volt 700 & Volt 800 front lights.Modes: RuntimeVolt 300Front:High/Rear:Constant: 3.5hrsFront: Flashing/Rear:Flashing: 130hrsVolt 400Front:High/Rear:Constant: 3hrsFront: Flashing/Rear:Flashing: 150hrsVolt700Front:High/Rear:Constant: 1.5hrsFront: Flashing/Rear:Flashing: 50hrsVolt800Front:High/Rear:Constant: 1.5hrsFront: Flashing/Rear:Flashing: 70hrs