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Revamped version of the iPhone 3G with faster processing speeds. Repair of this device is similar to the 3G, and requires simple screwdrivers and prying tools. Model A1303 / 16 or 32 GB capacity / black or white plastic back.
My iphone is shutting off at 75% now. It was shutting down at 50%. I have plug my iphone up to a power supply every time.
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Replace the battery. Here's a link to the iFixit guide.
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I think "hello" is giving good advice here. Please power off your device before working on it.
I had the same issue with my iPhone 5. Shutting off at 35%. The battery change solved the problem for me.
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