What are the blade specs? We know its 4.5" but what is the center hole size?

The arbor hole is 3/8" which makes the blades harder to find at the local hardware store. There is no adapter included, but also note that Dewalt clearly states not to use abrasive blades as that could overheat the motor.

What are the main differences between this and let's say the 7 1/4 inch circular saw? The cut depths are not that different.

It barely cuts through 2x lumber (1-9/16) that's only a 1/16 over the depth of 2x lumber, so I don't use it for that, personally. It's a wonderful "grab and go" saw for 1x material and sheet goods. I'm a homeowner weekend warrior user, so I'm not using it daily. But, so far it's cut through everything well and you can easily use it with one hand. I also have the 7-1/4 saw and use it when I cut 2x material as it will cut 1 inch deeper.

What's the part number for a compatible dust bag?

A dust port is included to connect to a vacuum. The port part number is N594300

can i use the dewalt battery from my cordless drill to power this saw?

Yes, if the battery of your cordless drill is 20v also. Batteries of all 20v tools, I believe, can be used to power any other 20v cordless tools.

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Description

⚡ Cut Fast, Cut Smart — Own the Jobsite with DEWALT ATOMIC!

SAFETY MEETS PRODUCTIVITY - Electronic blade brake stops the blade instantly, keeping your workflow fast and secure
VERSATILE BEVEL CAPABILITY - Easily bevel up to 45° for angled cuts and handle 2x material thickness at 90° with the robust bevel gear
CLEAN WORKSPACE EVERY TIME - On-board dust port minimizes mess, so your job site stays sharp and professional
UNMATCHED CUTTING ENDURANCE - Slice through 369 linear feet of 3/4-inch OSB on a single DCB205 battery charge*
PRECISION CONTROL AT YOUR FINGERTIPS - Ergonomic 1-1/2-inch finger trigger and removable auxiliary handle for ultimate grip and accuracy

The DEWALT ATOMIC 20V MAX* Circular Saw (DCS571B) is a compact, brushless cordless saw featuring a powerful 20V motor capable of cutting up to 369 linear feet of 3/4-inch OSB per battery charge (battery sold separately). Equipped with a 4-1/2-inch blade, bevel gear for angled cuts up to 45°, an electronic blade brake for safety, and an on-board dust port for cleaner operation, this tool is designed for professionals seeking precision, power, and portability in one sleek package.

Specifications

Manufacturer	DEWALT
Part number	DCS571B
Item Weight	2.99 Kilograms
Product Dimensions	45.42 x 13.03 x 16.99 cm; 2.99 kg
Batteries	1 Lithium Ion batteries required.
Item model number	DCS571B
Size	One Size
Color	black and yellow
Material	Metal
Power source type	Battery Powered
Voltage	20 Volts
Item Package Quantity	1
Handle Material	Plastic
Blade Length	2 Inches
Specification met	[Inferred] Yes, meets certain specifications in its category
Special Features	Brake, Brushless
Included components	(1) DCS571 20V MAX* Brushless 4-1/2 in. Circular Saw; (1) Wood cutting blade; (1) Blade change key; (1) Dust port adaptor; (1) Rip fence
Batteries Included?	No
Batteries Required?	Yes

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