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Posted on Feb 21, 2008
Answered by a Fixya Expert

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Small floor safe Sentry Model 3877 electronic lock and key

How long does the battery last for the electronic lock and how would you
open the safe if the battery died? We have had the safe for four years and have not changed the battery.

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  • 4 more comments 
  • Anonymous Mar 05, 2008

    Lost the mannual & need to change the battery for the combination. Need directions to change the battery.

  • Anonymous Mar 13, 2014

    Bighorn Classic, 30 gun electronic; battery reads 9.21 volts, all paperwork locked in safe; cannot open safe; can I get factory number to open safe?

  • Anonymous Mar 13, 2014

    I have a ten year old safe . its a electronic and key steele safe . I have serial no.M325860 and factory code 32298 which i have lost the key to how do i get a new key thank you for your help

  • Anonymous Mar 23, 2014

    I bought a sentry safe and I want to change the combination

  • Anonymous Mar 26, 2014

    It's locked and I can't get in it, it small cash fire proof box

  • Anonymous Mar 29, 2014

    sentry safe

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2 Answers

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  • Expert 113 Answers
  • Posted on Mar 05, 2008
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This manual will answer both of your questions.
http://www.sentrysafe.com/pdfs/OwnersManuals/501664.pdf

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  • Contributor 1 Answer
  • Posted on Jun 28, 2010
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My 3877 door open, I have lost my manual, i have my key.
How do I cancel my old combo and reset a new combination?

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Related Questions:

0helpful
1answer

We have a Sentry safe model number SC 3877. We just changed the batteries. We are imutting the correct code, the light turns green but does not give the 1 beep and we cannot open the safe. If we put in...
http://callitout.com/quotes/index.php/kick-it-to-the-curb/55/sentry-fire-safe-wont-open-its-broken/

Its the most reazonable answer and it worked!!!!!!! dial the code and tap on the handle so it would get lose
Read full answer
Jan 16, 2011 • Sentry Fireproof Safe
0helpful
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Cant open my programmable key pad safe. the code wont work
Locksmiths agree try replacing the batteries just slide open the battery cover located just below the keypad.
Insert a paper clip or pen point into the small hole in the cover. Push in while sliding cover to the right. Disconnect and remove the battery holder. Insert the 4-batteries as indicated.
reconnect the connector and put back the battery holder. Slide the cover back in place.
How do I insert the batteries on my advanced electronic lock safe? On the newer model Fireproof Sentry Safes my locksmith recommended me To install batteries,
turn the electronic lock case to the right and remove. Insert four new batteries as indicated, replace the electronic lock case and turn to the left to reassemble.
Read full answer
Aug 12, 2010 • Sentry Fireproof Safe
1helpful
1answer

When I key in the pin it says to proceed but the bolt wont open. do I have to change the batteries? If so, how do I change it? My safe is a fire safe S0607
Locksmith advice on how to install sentry safe batteries
slide open the battery cover located just below the keypad.
Insert a paper clip or pen point into the small hole in the cover. Push in while sliding cover to the right. Disconnect and remove the battery holder. Insert the 4-batteries as indicated.
reconnect the connector and put back the battery holder. Slide the cover back in place.
How do I insert the batteries on my advanced electronic lock safe? On the newer model Fireproof Sentry Safes my locksmith recommended me To install batteries,
turn the electronic lock case to the right and remove. Insert four new batteries as indicated, replace the electronic lock case and turn to the left to reassemble.
Read full answer
Aug 10, 2010 • Sentry Fireproof Safe
0helpful
1answer

I have a Sentry OA5835. I am unable to open with factory combo and key. help
Sounds like the batteries are dead.
How to install sentry safe batteries
slide open the battery cover located just below the keypad.
Insert a paper clip or pen point into the small hole in the cover. Push in while sliding cover to the right. Disconnect and remove the battery holder. Insert the 4-batteries as indicated.
reconnect the connector and put back the battery holder. Slide the cover back in place.
How do I insert the batteries on my advanced electronic lock safe? On the newer model Fireproof Sentry Safes my locksmith recommended me To install batteries,
turn the electronic lock case to the right and remove. Insert four new batteries as indicated, replace the electronic lock case and turn to the left to reassemble.
Read full answer
Mar 11, 2010 • Sentry Fireproof Safe
4helpful
1answer

The Sentry V260 safe will not open. Replace batteries?
Locksmiths agree on how to install sentry safe batteries
slide open the battery cover located just below the keypad.
Insert a paper clip or pen point into the small hole in the cover. Push in while sliding cover to the right. Disconnect and remove the battery holder. Insert the 4-batteries as indicated.
reconnect the connector and put back the battery holder. Slide the cover back in place. How do I insert the batteries on my advanced electronic lock safe? On the newer model Fireproof Sentry Safes my locksmith recommended me To install batteries,
turn the electronic lock case to the right and remove. Insert four new batteries as indicated, replace the electronic lock case and turn to the left to reassemble.
Read full answer
Mar 11, 2010 • Sentry Fireproof Safe
1helpful
1answer

Unable to open electronic safe
Locksmiths say this is how to install sentry safe batteries
slide open the battery cover located just below the keypad.
Insert a paper clip or pen point into the small hole in the cover. Push in while sliding cover to the right. Disconnect and remove the battery holder. Insert the 4-batteries as indicated.
reconnect the connector and put back the battery holder. Slide the cover back in place.
How do I insert the batteries on my advanced electronic lock safe? On the newer model Fireproof Sentry Safes my locksmith recommended me To install batteries,
turn the electronic lock case to the right and remove. Insert four new batteries as indicated, replace the electronic lock case and turn to the left to reassemble.
Read full answer
Mar 06, 2010 • Sentry Fireproof Safe
3helpful
1answer

Change battery of sentry safe
To install sentry fireproof safe battery
slide open the battery cover located just below the keypad.
Insert a paper clip or pen point into the small hole in the cover. Push in while sliding cover to the right. Disconnect and remove the battery holder. Insert the 4-batteries as indicated.
reconnect the connector and put back the sentry safe battery holder. Slide the cover back in place.
How do I insert the batteries on my advanced electronic lock safe? On the newer model Fireproof Sentry Safes my locksmith recommended me To install batteries,
turn the electronic lock case to the right and remove. Insert four new batteries as indicated, replace the electronic lock case and turn to the left to reassemble.
Read full answer
Dec 01, 2009 • Sentry Fireproof Safe
2helpful
1answer

My Sentry S3807 just will not open. I have the combination right and the key, but it won't open. The batteries could be shot, I suppose, but how do I get in?
How to install sentry safe batteries
slide open the battery cover located just below the keypad.
Insert a paper clip or pen point into the small hole in the cover. Push in while sliding cover to the right. Disconnect and remove the battery holder. Insert the 4-batteries as indicated.
reconnect the connector and put back the battery holder. Slide the cover back in place.
How do I insert the batteries on my advanced electronic lock safe? On the newer model Fireproof Sentry Safes my locksmith recommended me To install batteries,
turn the electronic lock case to the right and remove. Insert four new batteries as indicated, replace the electronic lock case and turn to the left to reassemble.
Read full answer
Aug 26, 2009 • Sentry Fireproof Safe
0helpful
1answer

I have a sentrysafe t6 mode i cannot open as battery is dead
Locksmiths install sentry safe batteries this way
slide open the battery cover located just below the keypad.
Insert a paper clip or pen point into the small hole in the cover. Push in while sliding cover to the right. Disconnect and remove the sentry safe battery holder Insert the 4-batteries as indicated.
reconnect the connector and put back the battery holder. Slide the cover back in place.
How do I insert the batteries on my advanced electronic lock safe? On the newer model Fireproof Sentry Safes my locksmith recommended me To install batteries,
turn the electronic lock case to the right and remove. Insert four new batteries as indicated, replace the electronic lock case and turn to the left to reassemble.
Read full answer
Jun 07, 2009 • Sentry Fireproof Safe
0helpful
1answer

Sentry safe
Sentry Home Safes battery location
slide open the battery cover located just below the keypad.
Insert a paper clip or pen point into the small hole in the cover. Push in while sliding cover to the right. Disconnect and remove the battery holder. Insert the 4-batteries as indicated.
reconnect the connector and put back the battery holder. Slide the cover back in place.
How do I insert the batteries on my advanced electronic lock safe? On the newer model Fireproof Sentry Safes my locksmith recommended me To install batteries,
turn the electronic lock case to the right and remove. Insert four new batteries as indicated, next replace the electronic lock case and turn to the left to reassemble.
Read full answer
Oct 26, 2008 • Sentry Fireproof Safe
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We have a Sentry safe model number SC 3877. We just changed the batteries. We are imutting the correct code, the light turns green but does not give the 1 beep and we cannot open the safe. If we put in...

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