Specification: Batteries Type: A grade lithium-ion polymer battery Input Current: 5V 1000mA Output current: 5V 1000mA Working temperature: 0 ¡ã -45 ¡ã Batteries Capacity: 4200mAh Storage / transport temperature: -20 ¡ã ¡À 50 ¡ã Cycle life: ¡Ý500 times Charging time: 2-4 hours Product Dimensions: L152.5 * W71.9 * H17.4(mm)