Whether you are just learning the basics of simple maintenance or are taking on a second addition to the house, a good cordless drill is essential. How to choose a cordless drill? Read this article for reference. 

Point 1 Choose the right voltage
All cordless power tools use rechargeable batteries as an energy source instead of plugging a cord into the wall, and these batteries and tools have certain voltage ratings stamped on them. For general use around the house, aim for a mid-voltage drill with either an 18- or 20-volt rating. Drills like this are light enough to be easy to use, yet strong enough that they can handle serious work when it comes up. 
12 volts is another popular cordless drill voltage and there are some small but effective drills in this category. If you value a particularly small and light drill, and you don’t expect to use your drill for anything more than boring holes in wood or drywall up to 7 mm or 8 mm in diameter, then a 12-volt drill will probably serve you well.

 
Point 2 Choose the right features
Most people know that a drill spins some kind of bit to bore holes in wood and plastic, but there are two other modes that cordless drills can sometimes have: “drill driver” (for driving screws) and “hammer drill” (for efficiently boring holes in masonry).
When a drill is marketed as a “drill driver”, there’s some way of limiting the amount of twisting force that the tool can deliver before controlled internal slipping kicks in. This makes it easier to drive screws to a consistent depth.
Some cordless drills are also advertised as “hammer” drills and this means something specific and useful for drilling in brick, block and concrete. Instead of just spinning a masonry drill bit, a hammer drill also introduces a high frequency back-and-forth pounding action. Think of it like a miniature jack hammer, pounding away while the bit spins. The bottom line is vastly faster drilling progress through any kind of masonry – three to five times faster, in fact. Hammer drills cost more, but they’re the only practical option for boring holes in masonry.

Point 3 Choose the right brand
An important thing to understand about power tools these days is that some of them are way too cheap with poor quality. Even an extremely cheap tool is no bargain at all if it stops you from working efficiently or it breaks in short order. You should choose some trustworthy brands, go with a name brand model like Gardenjoy. Pay attention to the number of batteries that come with the different kits and their size, too. Two batteries are always better than one.