Not using the iPhone 3GS enough may have a negative impact on the battery. To keep the average battery life of your phone at a high level, charge the device and then completely deplete it at least once per month. This keeps the electrons in the phone's lithium-ion battery moving, an important aspect of a healthy battery. Set your phone to auto lock after you finish using it. If the device is unlocked and thrown back into a purse or pocket, an application may accidentally become opened and operating without your knowledge, reducing the battery life.
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