Hi Showmethemoney.
I cant find the runtime specs but have had to empty the unit 9-10 times when cleaning main drains in pools on just one battery then used the same battery for my drill and its not gone flat. hope this helps.
PRODUCT OVERVIEW
Working on all Milwaukee 18-volt slide-on batteries, REDLITHIUM or NiCd, the Milwaukee 0880-20 Wet/Dry Vacuum offers long continuous run time and high air power and suction to provide quick and easy removal of dust, debris and water. A washable, reusable wet/dry HEPA filter delivers excellent fine dust collection and does not need to be changed between wet and dry applications. The stackable toolbox design, on-board hose and accessory storage offer excellent portability and convenience, a built-in blower port allows the vacuum to double as a blower, and the 1-1/4 in. hose allows standard vacuum attachments to be fastened. It includes vacuum, filter, hose, a crevice tool, and a wide nozzle.
Powerful motor to provide strong suction and air flow
Reusable, HEPA-rated wet/dry filter provides excellent fine-dust collection included with the Milwaukee 0880-20
Works on all Milwaukee 18-volt slide-on batteries, RED lithium or NiCd
Tool box style for easy transport and storage
Built-in blower port allows the vacuum to function as a blower
The Milwaukee 0880-20 has a 1-1/4 in. hose accommodates standard vacuum attachments
On-board accessory and hose storage
Compatible chargers: M18/M12 multivoltage (48-59-1812), M18 AC/DC (2710-20)
Compatible batteries: compact 1.5 Ah (48-11-1815), compact 2.0 Ah (48-11-1820), extra capacity 3.0 Ah (48-11-1828), extended capacity 4.0 Ah (48-11-1840)
Includes: (1) 0880-20 M18 cordless lithium-ion wet/dry vaccum, (1) filter, (1) wireless vinyl hose, (1) crevice tool, (1) wide utility nozzle
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SPECIFICATIONS
Air Volume (CFM) 45 Amperage (amps) 2.8
Assembled Depth (in.) 8.5 in Assembled Height (in.) 11.5 in
Assembled Width (in.) 19 in Built-In Accessory Storage Yes
Built-In Drain No Casters No
Color Family Reds / Pinks Color Family Red
Cord Length (ft.) 0.0 Filter Type HEPA
Hose Diameter (In.) 1.75 in Hose Length (ft.) 3 in
Manufacturer Warranty 5 Years Peak Horsepower 0 hp
Product Depth (in.) 18.5 in Product Height (in.) 15 in
Product Weight (lb.) 9.4 lb Product Width (in.) 11 in
Reconditioned No Returnable 30-Day
Vacuum Capacity (Gallons) 2 Voltage (volts) 18
Cheers