Slime Cordless Tire Inflator 40084 review

The Slime Cordless Tire Inflator (part 40084) is the battery-powered member of the Every Day line, not a 12V plug-in model and not the larger Cordless Pro Power Tire Inflator 40086. Its appeal is independence from a vehicle socket: Slime specifies an internal rechargeable 7.2V lithium-ion battery, USB-C charging, an analog dial and a manual on/off button. Its limitations are equally practical. The linked manual does not describe a user-selected pressure stop, and the maker's product page and manual disagree about tires per charge and the green hose lever.

A self-contained power route, with charging chores

The manual lists a 2,550 mAh battery and says to recharge through the USB-C port using the included USB-A-to-USB-C cable. The USB-A wall block is not included; Slime says a 2.1A phone or tablet block works and estimates about four hours for a full charge. It also says to charge before first use, after use and at least every four months to preserve battery performance. A computer USB port is expressly ruled out by the charging guidance. This is a real difference from socket-powered models such as Slime's 40050 or 40088, but it is not evidence that 40084 can fall back to a 12V outlet if its battery is depleted.

Battery capacity is not the same thing as usable runtime. The product page says one charge fills three standard car tires from flat to full; the manual's specification table says two. The manual identifies its eight-minute scenario as a P205/55R16 tire going from 0 to 35 PSI, and its single-charge entry also says two tires. Since the page and manual disagree, this assessment does not choose the larger figure or promise a number of tires per charge. Keep the unit charged for a planned task, and do not treat a low battery indicator as a performance forecast.

Read the gauge as a scale, not a pressure rating

The manual lists 0.24 CFM at zero pressure and marks the analog gauge from 0 to 60 PSI (0 to 4 bar). That tells you the dial's printed range; it does not tell you that 60 PSI is the inflator's maximum working pressure, or how accurate the gauge is. The manual's tire example is a manufacturer scenario, not an independent time trial and not a prediction for a different tire, starting pressure or battery state. Use the vehicle maker's recommended cold pressure from the tire-and-loading label or owner's information. NHTSA's TireWise guidance likewise directs drivers to vehicle information and cold-tire checks.

The manual gives a hose length of 1.6 feet, notably shorter than a typical long-cord roadside pump. That can matter if the valve is on the far side of a wheel or the inflator needs to sit on a stable surface. No extension, total reach, current draw, gauge tolerance or detailed tire-size capacity is established in the reviewed 40084 material.

Manual control and conflicting connection directions

The body has a dial and on/off control, not a documented target-pressure preset. The manual tells the operator to watch the pressure and press the button to stop at the vehicle-recommended value. The page's separate idle-shutoff statement describes the inflator turning off after a period of non-use; it should not be confused with stopping at a selected tire pressure. More importantly, Slime's current product page tells the user to press the head onto the valve with its green lever down and lift the lever to lock, while the linked 40084 manual says to push the lever down to lock the tire head. Those directions conflict. Check the lever supplied on the exact unit and follow matching instructions; the model number alone does not resolve the discrepancy.

There is a second caution around unattended use: the page describes a stable base and suggests that the pump can be placed on the ground, but the manual says not to leave it unattended. This review follows the manual's more cautious direction. Stay with the inflator, watch the pressure, and let it cool if it slows or gets hot.

Use and package boundaries

Slime's exact 40084 package graphic marks car, bicycle and balls/inflatables, and the product page says multipurpose adapters for balls and other inflatables are included. The manual drawing shows a ball-needle-style tip among the quick-connect accessories. A separate Presta fitting is not identified, so the bicycle icon does not establish a fit with every valve. The sources also do not give a bicycle-pressure range. For a sports ball, use its maker's pressure instructions and do not assume that the inflator's dial is accurate enough to replace a suitable gauge.

Slime's page calls the inflator suitable for broader inflatables, while the package graphic does not mark rafts among the recommended category icons. Because that presentation differs, this assessment relies on the narrower car, bicycle and ball/inflatable categories shown on the exact package and does not make raft use a recommendation. The unit is not identified as a truck/SUV inflator in that package. These package icons are manufacturer scope cues, not a guarantee of compatibility with a particular tire or object.

Who may want it

The 40084 is worth comparing when avoiding a running vehicle cord is central, you can charge it in advance and manual monitoring is acceptable. It is a less convincing fit when a preset stop is essential, the job involves repeated full-flat tires, you need a longer hose, or you cannot tolerate the unresolved per-charge claim. Its separate use cases do not turn the internal battery into an emergency power bank, and the page does not list a car-socket backup.

This is a source-based configuration review, not a hands-on test. The linked sources establish a rechargeable 40084, but they do not settle the page/manual differences on lock direction or battery count. Before buying, verify the part number, supplied head and cable, the included loose adapters, and the applicable instructions for the exact production version. Slime's 40084 product page and instruction manual are the primary references for those checks.