Cool Valentine---portable chargers(power bank)

Which portable chargers do you use?

I use this brand:KINKOO,has a massive 8,000 mAh capacity and intelligent output control system, it can Compatible with all Apple and Android smartphones, Tablets, GoPro Cameras, MP3 Players, Mobile Gaming Devices, Bluetooth Devices, and other USB charged devices.can charged my ipad 5 times already and it still has juice in it on week.that's enough for me,What do you think about this portable charger(power bank)? could you share your views?

This Valentine's day have discount for KINKOO,25% OFF your order.
Expire date: 2014-2-14,you could check it: www.ikinkoo.com