Is this drill good for drilling into concrete?

It handles light masonry such as brick and block in hammer mode. For repeated holes in hard concrete, a corded rotary hammer is the better tool.

Does it come with a battery and charger?

It depends on the version. Some kits include a battery and charger; bare-tool versions include neither, so check the listing before buying.

How does it compare with the older brushed DeWalt 20V drill?

The brushless motor gives more runtime and power and needs less maintenance. The three-speed gearbox also adds control the older single-speed brushed model lacks.

What is the difference between the three speed ranges?

Low speed gives high torque for driving large screws, mid speed suits general drilling, and high speed is for fast small-hole drilling. Hammer mode adds the pulsing action for masonry.

Can it use any DeWalt 20V MAX battery?

Yes. It runs on DeWalt 20V MAX batteries, including the compact and larger capacity packs, so it fits an existing DeWalt collection.

Is it too heavy for home use?

It is heavier than a compact drill/driver, but most homeowners find it manageable. If you mostly drive screws overhead, a lighter compact model may suit you better.