There's a lot to be said for cordless power tools. Coupled with the right cordless drill batteries, a cordless drill or similar is an awesome power tool to have to hand. Some of the more powerful run off a 28v battery, which delivers some seriously ramped up force.
Lacking the need for a power outlet, a cordless tool is handy in a tight spot, can be used just about anywhere you need it to and the ones on the current market are reliable, well designed and affordable.
They range from the type better applied to hobby tasks, to the industrial standard tools that can be found in the hands of pro tradesman around the country. They're great for woodwork, plumbing, remodeling and more.