The battery compartment is on the handle, and you open it by twisting the cap counterclockwise

The Swiffer WetJet holds four AA batteries in a cylindrical compartment built into the handle, just above where you grip it. To access them, grip the textured cap at the top of the handle and twist it counterclockwise — it will unscrew and come free in your hand. The batteries sit in a vertical stack inside, so you can see them once the cap is off.

Before you open the compartment, make sure the mop is switched off. If the spray trigger has been used recently, let the handle sit for a minute so any residual moisture can dry. Water inside the battery compartment can corrode the contacts and damage the mop.

Key Takeaways

  • The battery cap twists counterclockwise off the handle; do not pull or pry it, as the threads can strip.
  • Four AA batteries stack vertically inside, and you remove them by gently pulling the stack straight out.
  • When you reinsert new batteries, the positive end (marked with a +) faces upward toward the cap.
  • Screw the cap back on by turning it clockwise until it is snug, but do not overtighten.
  • If the mop does not spray after you replace the batteries, the contacts may be corroded and need cleaning with a dry cloth.

Remove the old batteries by pulling the stack straight up

Once the cap is off, you will see four AA batteries stacked end-to-end inside the compartment. Reach in and gently grasp the top battery, then pull the entire stack straight upward. The batteries are held loosely by gravity and the shape of the compartment, so they should come out as one unit without resistance.

If a single battery has fallen or shifted sideways, you may need to remove them one at a time instead. Tip the handle so the opening faces down and let gravity help, or use a plastic spoon handle or wooden stick to nudge them out. Never use metal tools, as they can short the contacts.

Insert new AA batteries with the positive end facing up

Before you load new batteries, look inside the compartment. You will see a small metal spring or contact at the bottom and another contact at the top where the cap screws in. The positive end of each battery (marked with a + symbol) must face upward toward the cap. The negative end (marked with a − symbol) faces downward toward the spring.

Stack your four new AA batteries with the positive ends all pointing the same direction — up. Gently lower the stack into the compartment, making sure they sit straight and do not tilt. The batteries should fit snugly enough that they do not rattle when you shake the handle.

Screw the cap back on clockwise until it is snug

Align the cap with the opening and begin turning it clockwise by hand. You will feel the threads catch after the first half-turn. Continue turning until the cap is hand-tight — you should feel resistance, but you should not need to strain. Overtightening can strip the plastic threads and make the cap difficult to remove next time.

Once the cap is seated, test the mop by pressing the spray trigger over a sink. You should hear a small motor sound and see a mist of water. If nothing happens, unscrew the cap again and check that the batteries are stacked correctly with the positive ends facing up.

Clean the battery contacts if the mop does not spray

If you have installed fresh batteries but the mop still will not spray, the metal contacts inside the compartment may be corroded or dirty. Unscrew the cap again and look at the small metal pieces at the top and bottom of the compartment. If they look dull, dark, or crusty, they need cleaning.

Use a clean, dry cloth or a pencil eraser to gently rub the contacts until they shine. Do the same to the ends of the batteries themselves — sometimes a thin film of oxidation builds up and prevents good electrical contact. Reinsert the batteries, screw the cap back on, and test the spray trigger again.

Replace batteries every 3 to 6 months depending on use

How often you need new batteries depends on how frequently you use the mop. If you use the Swiffer WetJet several times a week, you will likely need to replace the batteries every 3 to 4 months. Light use — once a week or less — may stretch that to 5 or 6 months.

You will notice the spray becoming weaker or more inconsistent before the batteries die completely. When that happens, it is time to replace them. Keeping a spare set of AA batteries in a cabinet near where you store the mop means you will not have to hunt for them when you need them.

Frequently Asked Questions

Can I use rechargeable AA batteries in my Swiffer WetJet?

Yes. Rechargeable AA batteries work in the Swiffer WetJet, though they may not last as long per charge as alkaline batteries. Make sure they are fully charged before you install them, and follow the same positive-end-up orientation as you would with regular batteries.

What happens if I put the batteries in backwards?

If the negative ends face upward instead of the positive ends, the mop will not spray and the motor will not run. The batteries will not be damaged, but the electrical circuit will not complete. straightforward remove the cap, flip the battery stack around, and reinstall it.

Why is water leaking into the battery compartment?

The cap may not be screwed on tightly enough, or the threads may be damaged. Unscrew the cap, dry the inside thoroughly with a cloth, and screw it back on firmly. If water continues to leak in, the cap or compartment may be cracked and the mop may need replacement.

Do I need to remove the batteries if I am not using the mop for a long time?

It is a good idea to remove them if you will not use the mop for more than a month. Batteries can leak or corrode over time, especially in humid environments, and removing them protects the contacts inside the compartment.