B2 is a replaceable battery pack specially designed for BOBOVR battery straps. The battery pack can be hot-swapped through magnetic attraction The weight is only 140g, which can better balance the front and back weight of the head, making it more comfortable to wear The 5200mAh capacity allows Quest2 to achieve twice the battery life, and can be quickly replaced by multiple battery packs to achieve unlimited battery life The maximum charging and discharging power of 15W can keep Quest2 running while maintaining power. When B2 is exhausted, it can be fully charged with 80% power in 2 hours It has 4 power indicator lights, a halo working light, and multiple redundant safety designs Specifications: Working voltage: DC 5V±0.3V Working current: input and output maximum 3A Battery type: Lithium-ion battery Battery capacity: 3.7V/5200mAh, 19.24Wh Rated capacity: 5V/1.5A, 3200mAh 0-100% charging time: about 3 hours 20-80% charging time: about 2 hours Indicator light: circular light, charging or discharging Power light: current battery power Button: single click: check the battery power, double click: stop output Automatic shutdown: when there is no power output, it will automatically shut down within 40 seconds Safety protection: overcharge protection, over-discharge protection, over current protection, short circuit protection, high and low-temperature protection Working temperature: 0℃-40℃