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

The Swiffer WetJet uses two AA batteries housed in a compartment at the bottom of the handle. To access them, locate the battery cap — it is either a twist-off cap or a slide-release cap, depending on your model year. Most WetJet models use a twist cap: grip the handle firmly and turn the cap counterclockwise until it comes free. Slide-release models have a small button or ridge you push while pulling the cap downward.

Once the cap is off, you will see the two AA batteries inside. They sit in a metal spring-loaded holder. Note which direction they face — the positive end (marked with a + sign) should point toward the top of the handle. This matters for the spray function to work.

Key Takeaways

  • The Swiffer WetJet holds two AA batteries in a compartment at the bottom of the handle, accessed by twisting or sliding off the cap.
  • Always note the battery direction before removing old batteries — the positive end must point toward the top of the handle.
  • Insert new batteries one at a time, pressing each one down firmly until the spring holds it in place.
  • If the spray does not work after replacing batteries, remove them and reinsert them to may support they are seated properly.

Remove the old batteries by pressing down on the spring

Once the cap is off, you will see a metal spring beneath each battery. To remove a battery, press down on the spring with your finger or a plastic tool — do not use a metal object, as it can damage the contacts. As you press the spring down, the battery will pop up slightly. Grab the exposed end and pull it out at an angle.

Remove both batteries this way, even if only one is dead. Old batteries can leak corrosive material, and mixing old and new batteries reduces performance. If you see any white or blue crusty material inside the compartment, wipe it away gently with a dry cloth or a cotton swab before inserting new batteries.

Insert new AA batteries with the positive end facing up

Take your first new AA battery and hold it so the positive end (the + marking) faces toward the top of the handle. Slide it into the battery slot at an angle, then press down firmly until the spring catches and holds it in place. You should hear or feel a small click. Repeat with the second battery in the other slot.

Press down on both batteries once more to confirm they are seated fully. If either battery feels loose or springs back up, remove it and reinsert it. A loose battery will not complete the electrical circuit, and the spray will not work.

Twist or slide the cap back on until it is snug

Once both batteries are in place and seated firmly, replace the battery cap. If your model has a twist cap, turn it clockwise until it is hand-tight — do not force it, as you can strip the threads. If your model has a slide-release cap, align it with the handle and push it down until you hear or feel it click into place.

Test the spray function by holding the WetJet over a sink and pressing the trigger. If water sprays out, the batteries are installed correctly. If nothing happens, remove the cap again and check that both batteries are pushed down fully and facing the correct direction.

What to do if the spray still does not work

If you have installed new batteries correctly but the spray does not work, the problem is usually a loose battery contact. Remove the cap and press down on each battery again, making sure it clicks into place. Sometimes a battery can shift slightly during the cap installation.

If the spray still does not work after reseating the batteries, check the battery contacts inside the compartment. If you see corrosion (white, blue, or green crusty material), clean it with a dry cotton swab. Corrosion prevents electrical contact even with new batteries. If the contacts are clean and the batteries are new and properly seated, the spray mechanism itself may be faulty, and you may need to replace the WetJet unit.

How often to replace WetJet batteries

Most users need to replace WetJet batteries every three to six months, depending on how often they use the mop. If you use it several times a week, expect to change batteries closer to every three months. Light users may go six months or longer.

You will know it is time to replace batteries when the spray becomes weak or stops working entirely. Some users keep a spare set of AA batteries on hand so they can swap them out when ready without having to run to a store. Alkaline batteries (like Duracell or Energizer) tend to last longer than generic brands in the WetJet.

Frequently Asked Questions

Can I use rechargeable batteries in my Swiffer WetJet?

Yes, rechargeable AA batteries work in the WetJet. They typically do not last as long as alkaline batteries between charges, so you may need to recharge them more often. Make sure they are fully charged before inserting them, and follow the same installation steps as you would with alkaline batteries.

What happens if I put the batteries in backwards?

If both batteries are reversed (negative end facing up), the spray will not work at all. If only one battery is backwards, the spray may work weakly or not at all. Always check that the + marking faces toward the top of the handle before closing the cap.

Why is my spray weak even with new batteries?

Weak spray usually means the batteries are not seated firmly enough to make full contact with the metal springs. Remove the cap and press down on each battery until you hear a click. If the spray is still weak, the spray nozzle itself may be clogged with dried cleaning solution — try running warm water through it.

Do I need to remove batteries if I am not using the WetJet for a while?

It is a good idea to remove batteries if you will not use the mop for more than a few weeks. Batteries can leak corrosive material inside the compartment if left unused for long periods, which can damage the contacts and make future batteries work poorly.