These are the most powerful cordless vacuums available from every major brand

Henry - Cordless (11.7 kPa)

Although the Henry brand is best known within the United Kingdom thanks to manufacturer Numatic International being a British company, Henry vacuum cleaners are widely available around the world. U.S. customers can usually find them in specialist stores, and they can be purchased from online retailers such as Amazon. What makes this brand so distinctive is that the standard model has an unusual canister shape and features a cartoon face that has become famous, even if its creation was something of an accident.

Outside of the traditional version of the Henry vacuum cleaner, Numatic also produces a small number of cordless versions. Appropriately called the Henry Cordless, the vacuum cleaner has a 30-minute operating time, a power boost function for troublesome dirt, and a quick charge time of just 3.5 hours for the 36V lithium-ion battery to reach full charge. For added convenience, it comes equipped with various attachments to make cleaning places like your car much easier. Powering the Henry Cordless is a 250W motor, which provides up to 1200mm H20 of suction, which equates to 11.7 kPa when converted. This vacuum is on the pricey side, though, and will set you back nearly $650. 

Vax - ONEPWR Blade 5 (18 kPa)

Vax is not a particularly big name in many parts of the world, but it is a well-known cleaning product brand in the United Kingdom and Australia. The company provides a wide range of electrical goods but is especially well known for its range of vacuum cleaners. (Although, it has recently ventured into a new range of products such as pressure washers and dehumidifiers.) Like most vacuum cleaner brands, Vax has both traditional vacuums and upright cordless versions.

Among the cordless range, the ONEPWR Blade 5 Dual Pet & Car cleaner stands out as the most powerful. The vacuum cleaner features a lengthy 90-minute runtime and comes with a variety of tools and attachments to help users clean hard to reach areas or locations. Meanwhile, the unique VersaClean Technology utilizes two different brushes to allow the vacuum to clean debris off all surfaces. It is particularly recommended for busy homes and those who have pets.

Compared to previous models in the Blade range, the Blade 5 has significantly beefed up its suction power. It now has a maximum hose suction power of 18 kPa, a full seven points higher than its predecessor. However, it is still lower than many rival cordless vacuums from other brands and underpowered for its $500 price tag. 

Hoover - HF9 (19 kPa)

The brand Hoover became so synonymous with vacuum cleaners that in some countries — including the United Kingdom and Ireland — vacuums are simply referred to as hoovers. In many ways, that's because the Hoover Company established the vacuum cleaner as an essential household item, with its release of the Hoover Model 0 all the way back in 1908. It makes sense that all these years later, Hoover products are still associated with quality.

Even in the age of portable cordless vacuum cleaners, Hoover has managed to stay relevant. The company's most recent, and also most powerful, cordless model is the HF9. Like other high-end vacuums, it features an LCD display to provide information such as battery level and the capacity of the bin. It also has a folding design, so it can be stored in small spaces.

When it comes to suction, the HF9 Pet is the more powerful of the range, with the vacuum cleaner able to tackle pet hair and larger debris. Testing of the model reveals it has a suction power of 20 kPa, some 6 kPa more than the Hoover HFX but lagging behind some of the other cordless vacuums available.

Eureka - H11 Elevate (25 kPa)

Eureka is a name that has been around for a long time as a vacuum manufacturer. First founded in 1909, the brand is now owned by a Chinese company called Midea Group, but was previously part of the Electrolux group. As you'd expect from a brand with so much history, Eureka has an extensive range of products, ranging from cylinder models to wet and dry cleaners that combine the functions of a vacuum cleaner and a mop to provide an all-in-one solution.

The cordless range Eureka offers includes the H11 Elevate. This is a lightweight model, which weighs a little over 3kg and sports a dust cup with 1 liter of capacity. Combined with the 60+ minutes of potential runtime, it's a good choice for those who don't want to face any interruptions from having to empty the vacuum or charge it in the middle of a job. It also comes equipped with an LED display and LED headlights, in addition to supporting a wall mount.

Powered by a 450W motor, the $210 Eureka H11 Elevate is on the higher end when it comes to sheer suction. At its maximum, the cordless vacuum cleaner is rated for up to 25 kPa of suction power.