Description: Very suitable for your mobile phone, can solve the problem of mobile phone suddenly without electricity for you. Ii is the best choice for back-up power. Type: Li-Ion Output Voltage: 3.8V Charging voltage limit: 4.35V Capacity: 2200mAh Compatible with: DOOGEE Y100x Smartphone Package Included: 1 x 2200mAh Battery for DOOGEE Y100x