1. ADATA Power Banks utilize rechargeable Lithium-ion batteries, and the value of rated capacities are affected by various factors including but not limited to ambient temperature, testing conditions and methods. The rated capacities of ADATA Power Banks are all tested and approved by a third party test labs under specified conditions. (The available capacity of rechargeable batteries decreases gradually with time and the number of uses according to battery characteristics.) 2. Output current will vary depending on the input charge properties of the device being charged.