SAMSUNG 50000mAh THIN 2USB Power Bank Portable External Battery Charger, Black with Silver

How to use:

1. Usually there is internal resistance in all mobile. and power bank will lost power when you charge mobile because this internal resistance. we called it is Conversion Rate

2. 8 hours charge can get the power bank full of power in normal times

3. Charging time depending on charger. The more,the faster

4. The output power is different for every mobile. Because mobile internal resistance is different.

5. All the power bank has Conversion Rate, as well as your phone, Charge will happens twice energy conversion!