I ordered universal power bank(2600 mah) from shopclues.com few days back. it arrived today. it costed me 150+49(delivery charge). a pen like cover in which it was placed with a keychain. powerbank looked great, way better than I expected. there are 2 slots for usb, one for chrging with adapter and one for charging mobile. firstly, I connected my mobile to it and it was not charging & I was in tension that is it not working?. then I pluged adapter in power bank and then charged my phone and it worked. thus, power bank came with 0% battery.
I kept on charging, a red light was on, after around 3 hrs that light turned to blue thus was fully charged. after this I connected my phone to power bank . my phone battery was 7%, it took 2.5 hrs to full charge. thus speed is not great but I was happy that when phone got full charged still power bank worked for half hour when I connected other phone to it. which meant it worked great.
Finally, I would say, at 199 rs its not at all bad infact this tiny sized powerhouse works for 3 hours and still dont get heated up. but the speed is bit low, but at this price its the best. also the fact that till how much time will it perform with same efficiency, is a concern, lets see.