Design a power bank of capacity 10,000mah(Li-Polymer) which provides two ports for charging mobile. It have following features 1. Power bank should be charged in less than 4 hours. 2. Power bank and mobile devices could be charged simultaneously. 3. Overvoltage protection 4. Overcurrent protection 5. short circuit protection 6. Cell balancing 7. Two Ouput USB ports for charging mobile one of 5V 1A and other of 5V 2A Need serious bidder. This may be start but it can turn into long term relation. Bidders from Pakistan are encouraged to apply.