The WetJet uses two AA batteries in the handle — swap them when the spray stops working

The Swiffer WetJet spray mechanism runs on two AA batteries housed in the handle. When the spray weakens or stops, the batteries are usually dead. Replacing them takes less than a minute and costs a few dollars. You do not need tools or special knowledge — just two fresh AA batteries and access to the battery compartment on the handle.

The battery door sits on the underside of the handle, toward the grip. It is a small rectangular panel that slides or twists open depending on your WetJet model. Once open, you remove the old batteries and insert new ones, making sure the positive and negative ends face the correct direction. The spray should work when ready after you close the door.

Key Takeaways

  • The WetJet holds two AA batteries in a compartment on the underside of the handle.
  • The battery door slides or twists open — check which type yours is before forcing it.
  • Insert new AA batteries with the positive end (+) facing the spring inside the compartment.
  • If the spray still does not work after new batteries, the spray mechanism itself may be clogged or broken.

Locating the battery compartment

Hold the WetJet handle in your hand with the spray trigger facing away from you. Turn the handle over so you are looking at the underside — the side that normally faces the floor when you are mopping. Near the grip, you will see a small rectangular panel. This is the battery door.

On most WetJet models, the door slides downward or sideways. On some older models, it twists counterclockwise. If you are unsure which direction yours moves, look for an arrow or line on the door itself — many have a small indicator showing which way to push or turn. Do not force it; if it does not move in one direction, try the other.

Removing old batteries

Once the door is open, you will see two AA batteries standing upright in the compartment. They are held in place by a metal spring at the bottom. Gently pull the batteries straight out toward you. They may stick slightly, especially if they have been in there a long time, but they should come free with light pressure.

Set the old batteries aside. You do not need to dispose of them when ready — just keep them separate from the new ones so you do not mix them up. If the batteries are leaking or corroded, wipe the inside of the compartment with a dry cloth before inserting new ones.

Installing new AA batteries

Take two fresh AA batteries. Look at the end of each battery — one end has a flat surface with a minus sign (−), and the other end has a raised bump with a plus sign (+). The positive end must face the spring at the bottom of the compartment.

Insert the first battery with the positive end down, pushing it gently until it sits flat against the spring. Insert the second battery the same way, positive end down. Both batteries should stand upright and parallel to each other. The door should close smoothly without forcing the batteries.

Testing the spray after replacement

Close the battery door by sliding or twisting it back into place until you hear or feel a click. Pick up the WetJet and point the spray nozzle toward a sink or bathtub. Pull the trigger a few times. You should see a mist of cleaning solution spray out when ready.

If the spray works, you are done. If it does not spray, open the door again and check that both batteries are inserted with the positive end facing down. If they are positioned correctly and the spray still does not work, the problem is likely a clogged spray nozzle or a broken pump mechanism inside the handle, not the batteries.

When to replace batteries again

AA batteries in a Swiffer WetJet typically last several months of regular use. You will notice the spray becoming weaker before it stops completely — the mist will be thinner or the spray will not reach as far. When this happens, it is time to replace the batteries again.

Keep a spare pair of AA batteries in your cleaning supply cabinet so you do not run out mid-cleaning. Alkaline batteries (the standard kind sold in most stores) work well and are inexpensive. Rechargeable AA batteries also work if you prefer them, though they may not last quite as long per charge.

Troubleshooting when new batteries do not fix the spray

If you have installed new batteries correctly and the spray still does not work, the issue is not the batteries. The most common cause is a clogged spray nozzle. Cleaning solution can dry inside the nozzle opening and block the flow. Soak the nozzle in warm water for a few minutes, then use a toothpick or small pin to gently clear any dried solution from the opening.

Another possibility is that the pump mechanism inside the handle has failed. This is a plastic valve that pushes solution up through the tube when you pull the trigger. If it is broken, the WetJet will need to be replaced — the pump cannot be repaired. You can test this by listening for a clicking sound when you pull the trigger with the battery door open. If you hear nothing, the pump is likely the problem.

Frequently Asked Questions

Can I use rechargeable batteries in my WetJet?

Yes. Rechargeable AA batteries work in the WetJet, though they may not last as long per charge as alkaline batteries. Make sure they are fully charged before inserting them, and keep a second set charged so you can swap them when the spray weakens.

What happens if I put the batteries in backwards?

The spray will not work. The batteries must have the positive end (+) facing the spring at the bottom of the compartment. If you insert them with the negative end down, the electrical connection will not complete. straightforward open the door and flip them around.

How long do AA batteries last in a WetJet?

It depends on how often you use it. Most people get several months of regular mopping from one set of batteries. Heavy daily use may drain them faster. You will notice the spray weakening before the batteries die completely, which gives you time to buy replacements.

Is the battery compartment waterproof?

The door seals well enough for normal mopping, but it is not fully waterproof. Avoid submerging the handle or spraying water directly at the battery door. If water does get inside, open the door and let it dry completely before inserting new batteries.

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

It is a good idea. Batteries can leak if left in a device for months without use, which can damage the compartment. If you are storing the WetJet for more than a few weeks, remove the batteries and store them separately.