I bought the "Just Mobile Gum Pro USB iPod External Battery 4400mAh" and am VERY happy with this. It has the most juice I could find, is small and compact and will add huge amounts of time to your phone use. In fact, it has enough juice to actually charge the phone 100% when completly dead while you continue to use it.
I personally got this for the golf course...I want to use my GPS app for the full 4 1/2 hours without turning it off.....and this will do the job.
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