Does the DCS356D1 come with a battery?

The DCS356D1 is typically sold as a kit with a 20V MAX battery and charger, but confirm the contents of the specific listing. Bare-tool versions exist and use the same batteries.

Will my existing DeWalt 20V batteries fit?

Yes. It uses the DeWalt 20V MAX battery platform, so existing 20V MAX packs fit. Larger XR packs give longer runtime.

What can I cut with it?

It handles wood, drywall, plastic and thin metal with the right blade, plus sanding and scraping. It is best for flush and plunge cuts where a circular saw cannot reach.

How does it compare with the DCS355?

The DCS356 is the newer brushless XR model with tool-free accessory changes and variable speed. It is the more capable choice if you already own DeWalt batteries.