How often do you change the filter

I have owned this vacuum in the 18v version for 10yrs in my construction buisness and just bought this 20v for my new truck. I have change the filter twice with a new one and have cleaned it an blown it out and blew out the gills with a air suppl at low pressure probably 1000 times. Do not use this vacum to pick up wet things at all. It will do it np, but whatever you put into it stays in it till you clean it out. Just clean and dump as you go and this vacuum will last a long time. Steve

Is the battery compatible with the 20v drill?

Maybe not. I returned the first vacuum I bought and got a replacement. The replacement has the same problem the original had. Both shut off after a few seconds of use. My theory is the problem is battery compatibility. I have the 20V max XR lithium DCB203b batteries. This battery is not mentioned in the user guide. I am going to return the second vacuum.

How easy is it to switch from wet back to dry pickup? does it make a mess? what happens with the filter?

Take the filter off first. too many complaints about wet filters. This is nothing different than other wet vacs quarter turn filter is removed.

How does this compare to the bigger 4 gallon dewalt as far as power goes?

I’m WAY late to this but I own both and find that they might even use the same motors. The only difference is capacity. Use the largest batteries you have though as when the batteries charge reduces the vacuum strength does reduce as they are powerful motors. I use 5 amp+ 20v batteries and more recently I love the 60v flexvolt batteries from my yard tools (chainsaw and leaf blower) they fit but the batteries end up taller than designed. Still works and runs forever like this.

Brand	DEWALT
Special Feature	HEPA, Portable, Wet/Dry/Washable Filter
Filter Type	HEPA Filter
Included Components	(1) DCV515B 1/2 gal Vac
Is Cordless?	Yes
Capacity	0.5 Gallons
Form Factor	Handheld
Color	Black/Yellow
Model Name	20V MAX CORDLESS WET/DRY VAC
Product Dimensions	8.44"L x 6.38"W x 17.69"H
Battery Description	Lithium-Ion
Noise Level	80 Decibels
Amperage	20 Amps
Manufacturer	DEWALT
Number of Items	1
Controller Type	Hand Control
Control Method	Touch
Style	Wet/Dry Vac Only
Connectivity Technology	Cordless
Portable	Yes
Number of Power Levels	2
Indoor/Outdoor Usage	Indoor
Finish Type	Brushed
Global Trade Identification Number	00885911461108
Vacuum Collection Technology	Suction with Hose and Filter-Based Collection
UPC	885911461108
Part Number	DCV517B
Item Weight	4.5 pounds
Item model number	DCV517B
Batteries	1 Lithium Ion batteries required.
Is Discontinued By Manufacturer	No
Size	UNITS
Finish	Brushed
Material	Blend
Pattern	Kit
Shape	Rectangular
Item Package Quantity	1
Measurement System	Metric
Display Style	No Display
Special Features	HEPA, Portable, Wet/Dry/Washable Filter
Batteries Included?	No
Batteries Required?	Yes
Battery Cell Type	Lithium Ion
Description Pile	Lithium-Ion
Warranty Description	3 year limited warranty.

20V MAX Hand Vacuum, Cordless, for Wet or Dry Surfaces, 1/2-Gallon Tank, Washable Filter, Portable, Bare Tool Only (DCV517B)

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