The item you are looking for is a popular type of portable, cordless high-pressure washer, often marketed as a "jet car wash gun."1 The key appeal is the freedom to wash your car or clean around your home without needing to be tethered to a power outlet or a continuous water tap.

Here are the typical features and details for a 1 Battery Jet Car Washing High Pressure Water Gun - Black:

Key Features and Specifications

FeatureDetailsPower SourceCordless (Battery-Powered). Uses a Lithium-Ion Rechargeable Battery (common voltages are 18V, 20V, 24V, or higher). Comes with the battery and a charger (since you specified "1 Battery").Portability & DesignLightweight, handheld, and compact 'gun' design, usually black in color. Extremely portable for washing cars, bikes, outdoor furniture, or cleaning decks/patios, especially in areas without an accessible water tap or power socket.Water IntakeSelf-Priming function, meaning it can draw water from various sources: a bucket, pool, water tank, or even a plastic bottle. Some models can also connect to a garden hose/tap.PressureOffers a higher pressure than a regular garden hose, typically ranging from 350 PSI to 400 PSI (or 24 to 90 Bar for higher-end models). This pressure is effective for light to medium cleaning of dirt and grime.MotorOften uses a pure copper motor with features like automatic start-stop (motor only runs when the trigger is pressed) for safety and battery conservation.