Spare battery for Voyager One self contained versions; Specification: Voltage (V)* 4.8; Typical capacity: (mAh)* 2000; Recharge time: 24 h Ambient temperature: °C. For replacement, please refer to the installation instructions for the luminaire. All values marked with an * are rated values. Unless stated otherwise, the values apply to an ambient temperature of 25°C; weight: 0.14 kg