Battery typeLithium polymer Battery capacity20000mAh 3.85V (77Wh) Charge voltage limit4.4V Temperature limit0℃ ~ 45℃ Input modesDC 5V / 2A 9V / 2A 12V / 1.5A Output modes2* DC 5.1V / 2.4A 9V / 2A 12V / 1.5A MAX18W Charging time (approximate)6.2 hours (9V/2A 12V/1.5A, OEM charger) Materials & Manufacturing More reasons not to worry Built with quality from start to finish. Superior hand feel and overall quality improvements are achieved with the usage of high quality, environment friendly PC + ABS. The perforated exterior provides a comfortable yet scratch and slip resistant hold. 20000mAh Mi Power Bank 2 is a demonstration of elegant utility. undefined undefined Mi Power Bank 2 20000m Brand Xiaomi SKU 100832559_NP-1021338937