Connect with us

Inserted 9v battery wrong way into fire alarm, expected damage?

Discussion in 'Power Electronics' started by raresoup, Aug 16, 2018.

Scroll to continue with content
  1. raresoup

    raresoup

    1
    0
    Aug 16, 2018
    Was in a rush and inserted 9v battery wrong way into a fire alarm. Not sure how much time passed but within 15-20 minutes i noticed the smell of something getting burned and quickly removed the battery. It was a bit too hot to hold, and it had deformed the plastic around it slightly. What permanent damage am i expecting here? Should I replace both the device and the battery?

    Not too tech savvy, this was just the forum that came up and seemed to fit my question
     
  2. KJ6EAD

    KJ6EAD

    1,114
    157
    Aug 13, 2011
    Do you mean a smoke alarm unit? The battery will be dead or nearly so and the alarm cannot be trusted. It's surprisingly poor design that would allow reverse installation and not have electronic protection to prevent damage. If the alarm is more than ten years old, it will be overdue for replacement anyway. If it's new, you may be able to get replacement under warranty.
     
    davenn likes this.
  3. Bluejets

    Bluejets

    3,997
    826
    Oct 5, 2014
    Never saw warranty cover reverse connection before.
     
    davenn likes this.
  4. KJ6EAD

    KJ6EAD

    1,114
    157
    Aug 13, 2011
    Warranties for consumer safety devices are often liberally interpreted as a hedge against civil liability. In other words, replacement with no questions asked is typical. It's better to replace a device that cost them $3 to make instead of accept the small possibility of significant exposure in case of a fire.
     
    Last edited: Aug 17, 2018
  5. Audioguru

    Audioguru

    2,791
    633
    Sep 24, 2016
    My smoke detectors are made so that a 9V battery cannot physically be installed backwards.
     
  6. Bluejets

    Bluejets

    3,997
    826
    Oct 5, 2014
    Any worth a cracker will.
     
  7. WHONOES

    WHONOES

    855
    206
    May 20, 2017
    Surely installing a battery backwards would result in no connection?
     
  8. Audioguru

    Audioguru

    2,791
    633
    Sep 24, 2016
    Maybe the smoke detector has no 9V battery jack designed to prevent contact when the battery is backwards, but has just two cheap contacts.
     
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day

-