A house burglar alarm battery. SLA type. Never once needed since no power cuts since installed so just sitting there on float.
- posted
17 years ago
A house burglar alarm battery. SLA type. Never once needed since no power cuts since installed so just sitting there on float.
Depends. If it's on a sunny wall, it'll last a little less time.
5 years it _should_ usually be OK. 10 years, it'll usually have failed, or need replaced very soon.
Thanks for that. It's at the top of the cellar stairs which have a door at the entrance, so no heat to speak of.
If you own a multimeter, and a suitable 12v(?) light bulb, it's fairly simple to test. Find a bulb that'll discharge the battery in 5 hours (Ah rating /5, so a
5Ah battery will need a 1A bulb). Now, monitoring every hour or so, measure how long it takes to get to 11V. It should be 3-4 hours.
Yes - I could do that. But modern car batteries seem to just die overnight with no warning - I've had the most recent two do just this - so I was more interested in a rule of thumb for SLA type's life.
I fitted an alarm at both my brothers house and his next door neighbours over the same weekend. My brothers battery went down after about 2 years. The alarms PSU was buzzing loudly and changing the battery cured the fault. His next door neighbours is still fine after 5 years. I have a battery in my parents alarm that is over 7 years old and still works when I kill the power to do some work.
I think a car battery will fail anytime after the warranty and only on a morning when you must be somewhere important at a specific time.
Adam
HomeOwnersHub website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.