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48 Part I — Hardware Hacks<br />

FIGURE 3-6: A lead-acid battery from a UPS device<br />

Usually, you remove the battery through a hatch at the back of the UPS unit (remember to disconnect<br />

it from the mains power supply first). Once you have the battery out, you will need a<br />

few things to complete the build:<br />

Wire (automotive wire like the type used to wire in spot lamps is ideal)<br />

A cigarette lighter socket<br />

A fuse and fuse holder (such as those used in an automotive spotlight or in car stereo<br />

parts; a 2A fuse will do just fine)<br />

Connectors to fit the connectors on the battery (sizes will vary and depend on the battery)<br />

A small car charger (to charge the battery when not in use)<br />

Some sort of case for the battery (heavy-duty nylon or cordura( works just fine)<br />

Assembly is easy. Wire the cigarette lighter socket to the battery, negative (–) to the frame of<br />

the socket and positive (+) to the center post, remembering to add a fuse holder with the fuse<br />

in the wire. Test the whole circuit with a multimeter before plugging a GPS power cord into<br />

the socket.

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