Replacing Batteries in a Sentry Safe

Quck answer

To replace batteries in a Sentry Safe, follow these steps:

1. Locate the battery compartment on the front of the safe.

2. Use a screwdriver or a coin to open the compartment.

3. Remove the old batteries and dispose of them properly.

4. Insert the new batteries into the compartment, making sure to match the positive and negative ends correctly.

5. Close the compartment securely.

6. Test the safe by entering the combination or using the key to ensure the batteries are working.

7. If the safe does not open or function properly, double-check the battery placement and try again.

8. Keep spare batteries on hand in case of emergencies.

By following these simple steps, you can easily replace the batteries in your Sentry Safe and ensure its proper functioning.


In order to access and open your Sentry safe, it is crucial to have well-charged batteries powering the keypad. If your batteries are running low or have died, opening certain models of Sentry safes can be more challenging. The location of the battery compartment varies among different Sentry safe models, so it is important to know the type of safe you have and where the battery compartment is located. Once you have this information, replacing the batteries before they die is a quick and simple process.

Choosing the Right Batteries for a Sentry Safe

Sentry recommends using fresh alkaline batteries for their safes. Most models require four AA batteries to power the electronic lock. It is advised to avoid using rechargeable and lithium batteries, as they may not function optimally in electronic safes. For best results, use batteries of the same brand and avoid mixing old and new batteries. When your safe requires new batteries, replace all of them at once.

How Often Should Sentry Safe Batteries Be Replaced?

The batteries in an electronic safe can last up to two years, but it is advisable to replace them before they die. If you frequently open your safe, you may need to change the batteries more often. It is recommended to change the batteries at least once a year, and more frequently if you access the safe regularly.

Some electronic Sentry safes have a low battery warning indicator. As soon as you notice this warning, replace the batteries to prevent them from dying. Models with external compartments make it easy to change dead batteries, but for safes with internal compartments, the process is more difficult. If your batteries die completely, your Sentry safe will retain your combination, allowing you to enter it once the batteries have been replaced.

Locating the Battery Compartment in a Sentry Safe

Battery Compartment Below the Keypad

Many Sentry electronic safes have a battery compartment located just below the keypad, providing easy access for battery replacement. Inserting a paper clip into the hole on the battery compartment cover allows you to slide open the compartment and remove the battery holder. After replacing the batteries, place the holder back in position and slide the cover closed.

Battery Compartment Behind the Keypad

Other models of Sentry safes have the battery compartment located directly behind the keypad. Models with the following letter combinations use a twist-off method:

  • CS
  • CSW
  • DA
  • DS
  • KS
  • KSW
  • MS
  • MSW
  • OA
  • OS

If there is a shipping screw present, remove it first. Then, twist the electronic lock clockwise to remove it. This will reveal the battery compartment, allowing for a quick replacement. Once the batteries have been replaced, put the lock back on and turn it counterclockwise to secure it.

Models with the following character combinations have a battery drawer on the right side of the lock:

  • SFW082B, E, F, G
  • SFW123B, E, F, G
  • SFW205B, E, F, G
  • STW123G
  • STW205G

To change the batteries, pull out the battery drawer, replace the batteries, and slide the drawer back into the lock.

Battery Compartment Inside the Door

For certain Sentry models, the battery compartment is located inside the safe, requiring you to open the door in order to replace the batteries. This applies to models starting with:

  • SFW123T, U
  • SFW205T, U

To replace the batteries, open the safe and locate the battery compartment on the inside of the door.

If the batteries are too low to operate the keypad, you can use the battery auxiliary override option on these models. There is a silicone cap on the side of the lock that can be opened. Insert a 9-volt battery to power the lock. Once the lock emits three chirps, press the center button to wake it up and enter the code to open the safe.

For other models with the battery compartment inside the safe, an override key is needed to open it in case the batteries run out. Insert the key and turn it to unlock the safe without entering the combination. This will reveal the inner battery compartment and allow you to replace the batteries.

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