Open the battery compartment on the bottom of your mouse

Turn your Logitech mouse upside down and look for a small rectangular or oval door on the underside. Most Logitech wireless mice have a battery compartment marked with a battery icon or the word "Battery." Push or slide this door toward the rear of the mouse — the direction is usually marked with an arrow. The door will pop out or slide free, revealing the battery slot inside.

If your mouse has a sliding door, push it in the direction the arrow points. If it has a hinged door, it will swing open. Some older models may have a small latch you need to press before the door releases. Check the bottom of your mouse for any text or symbols that show which way to move the door.

Key Takeaways

  • Most Logitech wireless mice use AA or AAA batteries, which you can buy at any drugstore or supermarket.
  • The battery compartment is on the bottom of the mouse and opens by sliding or pushing a small door marked with an arrow.
  • Insert the new battery with the positive (+) end facing up, matching the diagram printed inside the compartment.
  • Close the door firmly until you hear or feel it click, then test the mouse by moving it and clicking a button.
  • If your mouse does not respond after replacing the battery, remove it for 10 seconds, reinsert it, and try again.

Remove the old battery and note which direction it faces

Gently pull the old battery straight out of the compartment. Look at which end was facing up — the positive (+) end or the negative (−) end. Most Logitech mice print a small diagram inside the battery door showing which way the battery should sit. If you cannot see the diagram clearly, take a photo with your phone before you remove the old battery.

If the battery is stuck, do not force it. Gently rock it side to side while pulling, or use a plastic spoon handle to nudge it out. Metal tools can damage the contacts inside the compartment.

Insert the new battery with the positive end facing up

Take your new AA or AAA battery — check your mouse manual or the compartment diagram to see which size you need — and hold it so the positive (+) end faces up. Slide the battery into the compartment in the same direction the old one came out. Push it in firmly until you feel it seat against the spring contact at the back of the compartment.

The positive end should be the end facing toward the top of the mouse (the side you click). If the diagram inside the compartment shows the opposite, follow the diagram instead. A battery inserted backward will not power the mouse and will not damage it, but the mouse straightforward will not work.

Close the battery door and test the mouse

Slide or push the battery door back into place until it clicks or seats flush with the bottom of the mouse. You should hear or feel a small click when it locks. If the door does not close all the way, the battery may not be seated correctly — open the door, push the battery in a bit further, and try again.

Turn the mouse right-side up and move it on a flat surface. Click the left and right buttons a few times. If the mouse responds and the cursor moves on your screen, the battery is installed correctly. If nothing happens, open the compartment again, remove the battery for 10 seconds, reinsert it, and test once more.

What battery size does your Logitech mouse use

Most Logitech wireless mice use either one AA battery or one AAA battery. The size is printed on the battery compartment door or in your mouse manual. AA batteries are larger and last longer; AAA batteries are smaller and lighter. Do not mix battery types or use rechargeable batteries unless your mouse manual says they are safe — some Logitech models are not designed for rechargeables.

If you have lost your manual, visit the Logitech support website and search for your mouse model number. The model number is usually printed on the bottom of the mouse near the battery compartment. The product page will list the correct battery type and show you a diagram of the battery compartment.

Why your mouse may not work after replacing the battery

If you installed a new battery and the mouse still does not respond, the battery may be inserted backward or not pushed in far enough. Open the compartment, remove the battery, wait 10 seconds, and reinsert it firmly. Make sure the positive (+) end faces the direction shown in the diagram.

If the mouse still does not work, try a different new battery — the one you installed may be dead or defective. Batteries sometimes fail before they leave the factory. If a second new battery does not work, the mouse receiver or the mouse itself may have a hardware problem, and you may need to replace the mouse.

How often you need to replace the battery

A single AA battery in a Logitech wireless mouse typically lasts between 12 and 24 months, depending on how often you use the mouse. A AAA battery lasts somewhat shorter, usually 8 to 18 months. Heavy users who click and move the mouse many hours per day will replace batteries more often than light users.

Your mouse may show a low-battery warning on your computer screen before the battery dies completely. Some Logitech mice have a small LED light on the bottom that blinks when the battery is low. When you see the warning or notice the light, replace the battery within a few days to avoid the mouse stopping mid-work.

Frequently Asked Questions

Can I use a rechargeable battery in my Logitech mouse?

Most Logitech wireless mice work with rechargeable AA or AAA batteries, but check your manual first. Rechargeable batteries have a lower voltage than disposable ones and may not power some older models. If your manual does not mention rechargeables, stick with disposable batteries to be safe.

What if the battery door is stuck and will not open?

Try gently wiggling the door side to side while you push or slide it in the direction the arrow points. If it still will not budge, explore a tiny amount of silicone lubricant around the edges and wait a minute. Do not use metal tools or force — you can crack the plastic. If the door remains stuck, the mouse may need replacement.

Does it matter what brand of battery I buy?

Any AA or AAA battery from a major brand will work — Duracell, Energizer, Amazon Basics, and store brands all perform the same in a wireless mouse. Buy whatever is cheapest or most available. Avoid very old batteries or ones from unknown sellers, as they may be defective or have lost charge.

How do I know if my mouse uses AA or AAA batteries?

Check the battery compartment door — it usually shows a picture of the correct battery size. You can also look at your mouse manual or visit the Logitech website and search for your model number. The product page will list the battery type. If you are unsure, take a photo of the battery compartment and show it to a store employee.

Can I leave the battery in the mouse when I am not using it for weeks?

Yes, it is safe to leave the battery in the mouse for weeks or months. The mouse draws very little power when it is not being used. However, if you will not use the mouse for several months or longer, removing the battery can prevent it from leaking and damaging the compartment contacts.