eBay with BuyInCoins has the 12000mAh USB External Portable Power Bank (Black) for $11 + $1 shipping = $12 shipped. Ships from Hong Kong. Increases phone battery life, compatible with most phones including iPhone, and measures 10 x 7 x 2.3 cm.

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    kevz Ben's cred: 35
    Posted 10:04 am PDT 07/23/13

    I ordered this last month...I'm getting less than half it's rated capacity. maybe I got a bad one?

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    dave_c Ben's cred: 3666
    Posted 12:05 pm PDT 07/23/13

    ^ How are you measuring capacity? When they claim 12000mAH that's the internal battery capacity, not the output capacity.

    Roughly, it's something like 12000mAh internal battery capacity * 0.75 (generic battery capacity overrating) * 3.7V Li-Ion nominal * 0.8 (80% typical boost circuit efficiency) / 5V output = 5328mAh expected output capacity

    Now consider that charging a device isn't 100% efficient either so a 5328mAh output capacity wouldn't fully charge a device with a fully drained 5000mAh battery.

    Instead of capacity, compare price and features with other packs with the same 4 x 18650 cells configuration when considering the size and weight of pack you want to lug around. I don't recall seeing any 12000mAh output capable packs for $23 so two of these to get there may still be a deal, though their rating system does leave a lot to be desired.

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    alone9394 Ben's cred: 1
    Posted 1:53 pm PDT 07/23/13

    dont buy it...the really charging capacity is not what it says...false advertising

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    dave_c Ben's cred: 3666
    Posted 1:56 pm PDT 07/23/13

    ^ Yeah but as I attempted to point out, you're not going to get a real 12000mAh charger for $12, so do you want the highest capacity you can get for $12 or to pay a premium and lug around a brick over double the size to get 12000mAh? We all have decisions to make...

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