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Our AA battery test reveals that nickel- metal-hydride is the optimum technology, and Rayovac's 15-Minute Rechargeable I-C is the top performer.

All of the batteries that we tested. On the left are the disposable batteries, on the right are the rechargeable ones.

How many battery-powered devices do you routinely carry onboard? We did a quick check on a friend's boat and came up with the following devices: eight flashlights, one portable GPS, two handheld VHF radios, a digital camera, a clock, kitchen timer, binocular compass light, digital caliper, digital multimeter, portable CD player, portable MP3 player, and a cell phone. Most of these devices use disposable batteries. In fact, on his extended summer cruise he characteristically stocks 48 AA batteries, 24 AAA batteries, 20 C batteries, 24 D batteries, three 9V batteries, and three 123 camera batteries. None of these are rechargeable, but our friend says that will likely change soon. In…