Needing a portable battery

[jayuk20]

I'm looking for something that can give me a boost to around 50% from say 10%. I don't really want to spend too much and it needs to be smallish like the size of maybe 4 AA batteries

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[bjs188]

this is bigger but also more powerful than you mentioned. Just got it, it rocks.
Amazon.com: Anker? Astro3E 10000mAh Dual 5V 3A USB Output External Battery Pack Charger for Smart Phones, Android Phones, PS Vita, GoPro; iPad mini, iPhone 5 (Lightning Cable not Provided); iPhone 4S, iPad; Samsung Galaxy S3, Galaxy Note 2; HTC Sensa
if it's too big, check out there other products, some are smaller, and some even cylindrical. Hope it helps. I love my charger