Corded vs Cordless Power Drills
Corded power drills rely on an electrical cord for their source of power. Depending on the size of the job, they might also require an extension cord for the extra reach. Several benefits of a corded power drill are more power, durability, and lack of interruption in work in order to recharge the battery. For these reasons, corded power drills are preferred by professionals.
Cordless power drills, on the other hand, have *no* cord! They are powered entirely by batteries, thus giving you greater freedom of movement. However, one downside to cordless drills is that you are bound by the charge level of your battery. Different factors affect battery life, such as continuous use, the temperature, and the materials you are drilling into. One way to combat having to stop work to recharge the battery is to purchase a backup battery. This way, you can always be charging one, and switch them out as needed without having any downtime.
One awesome benefit of owning multiple batteries is that companies are starting to release more tools with the same battery housing, making the batteries interchangeable. That means, if you stick to buying all your tools from the same brand, you can use that same battery from your power drill, to your circular saw, to your reciprocating saw, and so forth. This way, you would only need two batteries at any given time to run a large variety of tools.