Dumb question, but does this come with a 20v battery and charger?

No, the DCS356B is a bare tool and will not include a battery or charger.

What battery charger does this use?

The DeWalt 18v (marketed as 20v) batteries are compatible with hundreds of DeWalt 20v power tools, so once you acquire a battery and charger it isn’t always necessary to buy a new battery for each tool. Now, here it can get very confusing but let me simplify your choices: for small tools like this, go for the 2AH battery. You’ll appreciate the lighter weight. If you need more run time, buy two. For heavy duty uses, the 5AH is the best choice. The various chargers range from 2AH, the higher the AH, the faster they will charge, but fast charging reduces your battery life. So, as a DIY user, I use the 2AH Charger (DCB107) and just keep several batteries on hand. If you’re contractor, with several people using batteries all day, you may want a fast charger. Incidentally, the PowerStack version of DeWalt batteries supplies more power and charges faster. In sum, any of the 20V chargers work, but some charger faster than others. Slower charging is better for the long-term life your your battery.

is there an adapter I can use with this to attach dremel blades and accessories?

I can't answer that directly.... but I have had several "undercut" saws as they were originally called. Use to undercut trim and doors when installing flooring. So having had blades from 3 different undercut saws I can tell you that any blade for any of the other models I've owned before the new Dewalt 20V has worked just fine in the Dewalt 20V because it comes with an adapter that is put between the oscillating arm and blade and then both are secured in the tool with the clamping mechanism. Which by the way does not require any other tool to lock the blade in the Dewalt 20V

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⚡ Power through projects with precision and speed—be the pro who never slows down!

ILLUMINATE YOUR WORKSPACE - Integrated LED light brightens dark corners for flawless accuracy every time.
TOOL FREE ACCESSORY CHANGES - Quick-Change system lets you swap blades and attachments in seconds—no wrenches needed.
PRECISION AT YOUR FINGERTIPS - Dual-grip variable speed trigger offers ultimate control tailored to every task.
SPEED SETTINGS FOR EVERY JOB - 3-speed selector adapts seamlessly from delicate cuts to heavy-duty applications.
UNMATCHED RUNTIME EFFICIENCY - Brushless motor delivers 57% more runtime for longer projects without interruption.

The DEWALT 20V MAX XR Oscillating Multi-Tool (DCS356B) is a cordless, brushless motor multitool featuring a 3-speed selector (up to 20,000 OPM), dual-grip variable speed trigger, and a bright LED light for enhanced visibility. Designed for extended runtime and compatibility with most oscillating tool accessories, it includes two wood cutting blades and a quick-change accessory system for efficient workflow. Backed by a 3-year limited warranty, this 2.4-pound tool is engineered for professional-grade performance and versatility.

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Manufacturer	DEWALT
Part Number	DCS356B
Item Weight	2.4 pounds
Product Dimensions	12 x 1 x 3.06 inches
Item model number	DCS356B
Is Discontinued By Manufacturer	No
Size	One Size
Color	Multi
Style	XR Oscillating Multi-Tool
Finish	Brushed
Material	composite
Pattern	Solid
Shape	Rectangular
Power Source	Battery Powered
Voltage	20 Volts
Item Package Quantity	1
Special Features	Cordless
Included Components	(1) DEWALT Multi Tool
Batteries Included?	No
Batteries Required?	Yes
Warranty Description	3 Year Limited Warranty

DEWALT 20V MAX XR Oscillating Multi-Tool Cordless, Variable Speed Brushless Motor Multitool with LED Light, Extended Runtime, Includes Two Wood Cutting Blades, Tool Only (DCS356B)

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