Where the batteries go and what you need

The Swiffer WetJet holds four AA batteries in a compartment on the handle, just above where the cleaning pad attaches. You'll need four fresh AA batteries—alkaline or rechargeable both work—and about two minutes. The battery door is a small rectangular panel on the back or side of the handle, held in place by a single screw.

Before you start, check whether your WetJet is still under warranty or has a known battery issue. Some older models had defective battery contacts that caused the spray mechanism to fail even with fresh batteries. If the unit is relatively new and the spray stopped working suddenly, the problem might not be the batteries themselves.

Key Takeaways

  • The battery compartment is on the handle, accessed by removing a single screw from the battery door panel.
  • The WetJet uses four AA batteries, and you should replace all four at the same time rather than mixing old and new.
  • Insert batteries with the positive (+) end facing the spring contact inside the compartment.
  • If the spray doesn't work after replacing batteries, the battery contacts may be corroded or the spray pump may have failed.

Removing the old battery door

Locate the battery compartment on the handle. On most models, it's a small rectangular door on the back of the handle, roughly two inches long. You'll see a single Phillips-head screw in the center or at one end of the door.

Use a Phillips-head screwdriver to turn the screw counterclockwise. Don't force it—if it's stuck, spray a tiny amount of penetrating oil around the screw head and wait a few minutes. Once the screw is loose, gently pull the door away from the handle. It may stick slightly if there's dried cleaning solution around the edges, so work it free carefully.

Taking out the old batteries

Inside the compartment, you'll see four AA batteries arranged in two rows. They're held in place by metal springs at one end. Gently push each battery toward the spring end to release it, then slide it out. Don't pry them out with a screwdriver, as you can damage the springs or the plastic compartment.

If a battery is stuck, it's usually because corrosion has built up on the contacts. Dip a cotton swab in white vinegar and wipe the battery and the metal contacts inside the compartment. Let it dry for a minute, then try again. If corrosion is heavy, you may need to replace the battery contacts themselves—this requires opening the handle further and is usually not worth the effort on an older unit.

Installing new batteries correctly

Before inserting new batteries, look at the compartment. You'll see a small metal spring at one end of each battery slot and a flat contact at the other end. The spring end is the negative (-) end; the flat contact end is the positive (+) end.

Insert each new AA battery with the positive (+) end facing the flat contact and the negative (-) end toward the spring. Push gently until the spring compresses and the battery sits flush in the slot. Do this for all four batteries. If a battery doesn't sit flush or feels loose, remove it and check that you've inserted it the right way around.

Closing the battery door and testing

Slide the battery door back onto the handle, aligning the screw hole. Insert the Phillips-head screw and turn it clockwise until snug. Don't overtighten—you only need enough pressure to hold the door in place. If you overtighten, you can crack the plastic door or strip the screw hole.

Fill the WetJet's cleaning solution tank with water or the Swiffer cleaning solution, then test the spray by pressing the trigger. You should hear a brief motor sound and see a mist. If nothing happens, remove the battery door again and check that all four batteries are inserted correctly and sitting flush. If the spray still doesn't work after that, the spray pump itself may have failed.

What to do if the spray still doesn't work

If you've replaced the batteries and the spray mechanism still won't set up, the problem is likely the spray pump or the battery contacts, not the batteries themselves. Check the battery contacts for corrosion by looking at the metal springs and flat contacts inside the compartment. If they're green, white, or discolored, clean them with a vinegar-soaked cotton swab and let them dry completely.

If the contacts look clean and the spray still doesn't work, the spray pump has probably failed. This is a sealed component inside the handle and cannot be repaired at home. At this point, replacing the entire WetJet is usually cheaper than trying to repair the pump. Most units cost between $20 and $35 new.

Extending battery life in your WetJet

Replace all four batteries at the same time, even if only one seems dead. Mixing old and new batteries reduces the overall power available to the spray motor and can cause it to fail prematurely. Store the WetJet with the battery door closed to prevent dust from settling on the contacts.

If you use the WetJet infrequently, remove the batteries during long storage periods. Batteries can leak inside the compartment if left unused for months, and leaked battery acid will corrode the contacts and damage the spray mechanism. Rechargeable AA batteries work fine in the WetJet and can save money if you use the mop regularly.

Frequently Asked Questions

Can I use rechargeable batteries in my Swiffer WetJet?

Yes. Rechargeable AA batteries work in the WetJet and often perform as well as alkaline batteries. They cost more upfront but save money over time if you use the mop regularly. Make sure all four batteries are the same type—don't mix rechargeable and alkaline.

Why does my WetJet spray stop working after a few weeks?

The spray motor draws a lot of current, so batteries drain faster than in other devices. Replace all four at once. If the spray stops working when ready after you install new batteries, the spray pump has likely failed, not the batteries.

What should I do if battery acid leaks inside the compartment?

Wipe the compartment dry with a paper towel, then soak a cotton swab in white vinegar and clean the metal contacts and battery slots. Let everything dry completely before inserting new batteries. If corrosion is heavy, the contacts may be permanently damaged and the unit may not work.

Is it normal for the spray to be weak?

A weak spray usually means the batteries are running low or the spray nozzle is clogged. Replace the batteries first. If the spray is still weak, unscrew the spray nozzle at the top of the handle and rinse it under warm water to clear any dried cleaning solution.