The PSU 4-18 battery-powered pressure sprayer helps you spray liquids in the garden to maintain and protect your plants. Whether it's fertilizing, pest control, weed control or watering small seedlings - the PSU 4-18 is perfect for all of the above applications with a spray mist/spray jet. There's no need to pump the pressure manually to increase the pressure. You can activate the pressure sprayer's pump by simply pressing a button. The spray jet can be switched on as needed with the trigger on the hose, switched to continuous operation or can be continuously adjusted directly on the nozzle from a fine mist to a pointed jet. The shoulder strap makes it easy to carry the battery-powered pressure sprayer, leaving one hand free. The 4-liter tank has a built-in fill level indicator, and the tank lid also serves as a measuring cup for measuring the spray. For ergonomic work, the hose can be extended up to 75 cm for more remote areas. Storage The 18V battery sprayer can be stored in a space-saving manner as the hose can be removed and attached to the hose clip on the battery cartridge.

FEATURES AND BENEFITS
Telescopic spray hose - extended reach, easier access to hard-to-reach places.
Trigger - for easy and fatigue-free operation.
Infinitely variable spray pattern - depending on the application, the user can switch between a fine mist and a pinpoint jet.
4-liter tank with fill indicator - a constant view of the fluid level.
Integrated measuring cup in the tank lid - for quick spray measurement.
Spray tube holder - for space-saving storage.
18 V Kärcher battery (not included) - real-time technology with LCD display: remaining operating time, remaining charging time and battery capacity. Durability and performance are guaranteed by lithium-ion cells.
The replaceable battery can also be used with other devices from the Kärcher 18 V Battery Power platform.

Technical data
Battery-powered device
Battery platform Battery platform 18 V
Working pressure (bar) 3
Flow rate (l/h) max. 30
Water tank capacity (l) 4
Battery type Lithium-ion replacement battery
Voltage (V) 18
Number of batteries required (Piece(s)) 1
Operating time with full battery (min) max. 400 (2.5 Ah) / max. 800 (5.0 Ah)
Weight without accessories (Kg) 1.8
Weight including packaging (Kg) 2.8
Dimensions (L x W x H) (mm) 750 x 182 x 365

Scope of delivery
Option: Battery and charger not included
Shoulder strap
Measuring container

Equipment
Telescopic spray hose: 0.45 m, 0.75 m
Trigger
Pipe fixing clamp
Charge level indicator

Same summary

The Karcher PSU 4-18 Battery cordless pressure sprayer is particularly suitable for users looking for a mobile and practical solution for lighter or occasional garden tasks where a cordless tool is useful. Due to the 18 V voltage and no included battery, it makes sense mainly as an upgrade to an existing Karcher system or for hobby users who already have a suitable battery at home. For more intensive or longer use, the classic motor, which is not brushless, may be a limitation, so the model is more suitable for shorter and less demanding tasks. Before choosing, it is worth checking the compatibility of the battery system, as the sprayer cannot be used without the right battery.

Recommendation source: Enaa guides and team experiences.

User view

This sprayer is most often used by users who already use other Karcher battery-powered devices or want to expand their existing system without unnecessary duplication of batteries. In practice, the product performs best when watering plants, applying protective agents or basic cleaning around the house, where compactness and quick use play a major role - even if you only do the work occasionally.

Many users choose the Kärcher brand because of their reliability and the fact that most of the tools in the system are compatible with each other, which allows for modular expansion of the tools according to actual needs.

Why buy at Enaa

At Enaa, you can expect a clear presentation of product compatibility with other tools from the same system, which simplifies the choice for your household. In addition, we provide you with professional descriptions for hobby and home use, so you can find a tailor-made solution faster.

Answers to frequently asked questions

Can I use any 18V battery with this sprayer?

This model is designed to be used with a Karcher battery from their 18V system. It is important to check that you have a properly compatible battery from the same brand before use.

What types of gardening tasks is this sprayer best suited for?

It works best for lighter and occasional tasks, such as watering smaller flower beds, applying protection, or simple cleaning, where prolonged or intensive use of the device is not required.

Can I also apply cleaners or harsh chemicals with a sprayer?

The device is designed for use with water and common garden care products, but is not recommended for very aggressive liquids or thick preparations, as this may cause blockages and damage.

What should I do if I don't have any Karcher batteries or chargers yet?

If you do not have a Karcher battery, you will need to purchase a compatible battery and charger separately, as they are not included with this model.

Description updated: April 2026