Change a normal 9v battery into a life saver. If you have ever run out of juice on your phone and could really use a quick charge then you need a USB battery.

[VIA]

BatteryCare is a free utility created to optimize the usage and performance of the laptop battery. The utility monitors the battery discharge cycles and helps increasing it’s autonomy and improving it’s lifetime. The utility shows all the detailed information about the battery, such as wear level, capacities, consumption, manufacturer. Depending on the power source of the computer, the application can automatically select the power plan you prefer. You can also disable services like Aero and other effects in Windows Vista and Windows 7 in battery mode.

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Save about $40 on batteries. You’ll be surprised!