Because the iPhone 3G doesn’t have a user-replaceable battery — and because it’s so easy to burn through a full charge before the end of a day — some users may need a variety of power charging solutions. They need to keep the included universal serial bus cord or dock handy at home, and perhaps have one in the office. One also might need a car charger and might seriously consider an external portable battery. There are several external portable batteries on the market, and I chose two different types of portable battery power from reputable dealers to evaluate.

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