JESIMAIK 4.8 Gal Battery Powered Backpack Sprayer with 4.0Ah Battery

The JESIMAIK 4.8 Gal Battery Powered Backpack Sprayer is an electric spraying system built for homeowners and landscapers managing lawns, gardens, orchards, and driveways. Powered by an included 4.0Ah battery, it eliminates manual pumping while delivering up to 120 PSI of pressure and a flow rate of 0.8 gallons per minute through its diaphragm pump.

A standout design choice is the handle-mounted rotary dial, which places stepless pressure adjustment from 0 to 120 PSI right under your thumb. Instead of reaching behind your back to fiddle with a tank-mounted knob, you can adjust output on the fly to switch between light plant misting and high-pressure weed treatment. The 33-inch telescopic stainless steel wand resists chemical wear and extends your reach into high branches or under dense foliage.

For extended outdoor tasks, the included 4.0Ah battery provides 3 to 4 hours of continuous runtime, which covers up to 16 full tank refills per charge. To help manage the load, the sprayer includes an ergonomic harness system with padded shoulder straps and waist support to balance the weight of a full 4.8-gallon load. Five nozzles (fan, cone, stream, dual, and windproof) are included to suit various yard tasks, alongside a wide-mouth tank opening with gallon markings and an anti-clog filter.

Carrying a full 4.8-gallon liquid load is inherently heavy, so users who prefer ultra-light gear will need to rely on the waist support or mix smaller batches. Additionally, the manufacturer leak-tests every unit before shipping, meaning you might find small amounts of residual water in the hose, nozzle, or tank bottom right out of the box.

Verdict: This sprayer is an excellent match for property owners and gardeners who want high pressure and precise handle control without the hassle of manual pumping. Its generous battery life and varied nozzle set make it well suited for extensive yard maintenance.

• Tank Capacity: 4.8 gallons
• Maximum Pressure: 120 PSI
• Flow Rate: 0.8 GPM
• Battery Capacity: 4.0Ah
• Battery Runtime: 3 to 4 hours (up to 16 tanks)
• Wand: 33-inch telescopic stainless steel
• Nozzle Attachments: 5 (fan, cone, stream, dual, windproof)
• Warranty: 1 year

A great fit if you:

• Need to spray large lawns, fence lines, or orchards without manual pumping.
• Want to adjust spray pressure instantly without reaching around to the back of the tank.
• Require long runtime to empty multiple tanks on a single battery charge.
• Need different spray patterns for both broad lawn coverage and targeted spot treatments.

Consider something else if you:

• Prefer a smaller, handheld sprayer to avoid carrying heavy liquid loads on your back.
• Only need a basic, fixed-pressure tool for occasional indoor plant care.

Why is there water inside the tank or hose of a new unit?
Every unit is leak-tested at the factory before shipping, so small amounts of residual water near the bottom, hose, or nozzle are normal.

How long does the battery last on a single charge?
The included 4.0Ah battery runs continuously for 3 to 4 hours, which provides enough power to spray up to 16 full tanks.

What spray nozzles come in the box?
The kit includes five interchangeable nozzles: fan, cone, stream, dual, and windproof.

How do you adjust the spray pressure?
You can adjust the pressure from 0 to 120 PSI using the stepless rotary dial mounted directly on the spray handle.