The older your iPhone gets, the worse its battery performs. Don't blame Apple: it's just the nature of rechargeable batteries that they wear out over time.
Sadly, you can't just swap in a new one--not without some warranty-voiding surgery. But you can plug in external power, which is cheap, easy, and affordable.
For example, Meritline has an 1800mAh iPhone backup battery for $9.99 shipped. That's after applying coupon code MLC262531102717A (which expires Oct. 29) at checkout.
The standard iPhone 3G battery has an 1150mAh capacity, meaning this plug-in pack should afford at least 50 percent … Read more