Operational switches: There are usually two switches, one on/off, the other up/down. A popular extra is a cable extension so you can use these items further from the vehicle. Power cable: Power cable length is usually around 11 or 12 feet, which is plenty for the jack and will normally reach all around your vehicle if a pump or impact wrench are included. On some jacks you get two, low and high, for sedans or SUVs. Saddle: The saddle is the piece that rests against the vehicle’s frame. Usually these come with two sockets, which fit just about every wheel nut around, but check them against your lug nuts before you’re in an emergency situation. Wrench: In either case, the impact wrench will be an individual tool. You may want to check the output of the tire pump, but it’s safe to say they’re acceptable as an emergency device, rather than providing the rapid inflation you get from a compressor. In scissor jack kits, the tire pump and flashlight will be separate. Scissor versus bottle: On bottle-type jacks, the tire-inflator pump is often built into the jack unit (and the unit may also include a flashlight). So why not take advantage of the electrical power on offer and buy a kit which includes powered versions of both of these? You can buy an electric car jack on its own, but you’ll still need a lug wrench to remove and reinstall the lug nuts that attach the wheel to the vehicle and perhaps a tire pump for instances when a tire may simply be low on pressure but not punctured and doesn’t require removal. They will still raise your vehicle to the required height in just a minute or two, which is probably as fast as you could do it manually, but without the physical effort. That’s actually a good thing, because it gives you plenty of time to make adjustments if necessary, or stop if you think things aren’t safe. It’s important to understand that these devices aren’t super fast. In general, the maximum lift height of electric car jacks is between 14 and 18 inches, though a few reach 20 inches. You’ll want to be sure the jack can lift the vehicle high enough to raise the tire off the ground for removal. Maximum lift height will be worth checking if you have an SUV or off-road vehicle, which can sometimes have a very high clearance between the chassis and the ground. Most are between five and six inches, though heavy-duty models can be eight inches.
Minimum lift height is only really a consideration for low-slung sports car owners, as you’ll need to be sure that there’s enough clearance to get the jack in place under the vehicle. You want the curb weight, not the gross vehicle weight (which is the maximum with passengers and luggage).
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The information will be in your owner’s manual and should also be on a sticker or plate on the driver’s side door frame. Many people don’t know how much their vehicle weighs (why would you?) but it’s important to find out before choosing an electric jack. Always choose a jack that comfortably lifts in excess of the weight of your vehicle. You would just be guessing, and that’s not really safe. Some people advise that an electric car jack will raise more than its stated maximum, but we strongly advise against that approach. Weight ratings run from around 2,000 pounds right up to 11,000 pounds. The two most important things you need to look for in an electric car jack are weight rating and minimum and maximum lift height. What we’re looking at here are electric car jacks designed primarily for lifting your vehicle to change a wheel. Note: During our research we found some confusion (even among reviewers) between these devices and electric tongue jacks, which are used for raising and lowering a trailer or camper when attaching or removing it from a tow hook. The required electricity comes from the vehicle’s battery, usually via the internal power socket, though some jacks are also supplied with crocodile clips for attaching directly to the battery, if preferred. In the case of a powered version, a 12-volt DC motor either winds the scissor jack’s main screw or pumps the bottle jack. They’re based on either a mechanical scissor jack (the kind often supplied with your vehicle) or a manual hydraulic bottle jack, which is normally pumped up with a long bar.
These are really quite basic devices, which is good, because simplicity equals reliability. Owners of pickups, SUVs or off-road vehicles need to check that the electric jack they’re considering provides sufficient lift height.
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