Portable Power bank for Xperia P



Can you suggest a good power bank (for charging portably) for my Xperia P within 2200 Mhz at a budget of 1.5k

I am going on a trip in December, and might need an accidental charge, given the huge power usage of Android phones, and extra camera usage ;)

Suggestions with links to buy online are welcome.........

I was looking at Cooler Master Power Fort 5600 but its way too costly
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