essential battery changes in a place

in residential or commercial, what are essential devices that should need battery replacement/checks periodically.. example: fire alarms.
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...and second important is the hearing aid device.
the best way is to refer to the user manual of those devices, and check relevant details and instructions
since it depends not only on devices or usage, but also product specific specs
some systems now has management software for remote diagnostic, so you minimize manual test and checks
house security alarms, wall clocks
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Thibault St john Cholmondeley-ffeatherstonehaugh the 2ndCommented:
Automatic door closers, the ones that operate when they detect the fire alarm. Smoke detectors, CO2 detectors.
To be precise, I have to give an unprecise answer: It depends on the circumstances ... every battery powered (or battery backed up) device you don't want to die silently.

I'll go a bit into depth ... every location has different devices, and for every device you have to consider if its purpose is critical if the device runs out of power.

If  you want to do tha serious, you'll have to sweep the location for each and every device that has a battery inside. The you should assess them with the questions

- would it matter if the device runs out of power and nobody mentions ?
- would it matter if the battery leaks and ruins the device ?
- would it be possible to store the device w/o battery inside and power it with fresh batteries only if needed ?

Depending on the answers it would be clear which devices should get a periodic replacement regardless of remaining charge or a perodic check for charge and "end of life date". And some devices need just the batteries removed and there should be a stock of fresh batteries (regulary checked for "end of life" date) for such devices.
just to add  2cts : a normal home easily has more than 100 devices powered by batteries
so -  if you want to check them all, best make a list; maybe per room?
also - the checks can differ for normal and rechargeable batteries; for normal ones, you can check the voltage as first general check; eg if a 1.5 device only shows 1.3V it is already dying and needs to be repalced

for the rechargeable ones, you may need to do do a full discharge/charge cycle, to ensure what life it still got
100 devices?
You just made me curious. What those can be?
I have difficulties to count 20 such devices in my house.

Here it is one more device: the remote controls for TV, audio-video equipment.
Further: One has to consider batteries in places a regular citizen would not usually think about, like the BIOS battery in your PC or Laptop.
ALL remote's for starters
+all battery driven devices - wall and wrist clocks
PC's, ipad's  and nearly all electronic devices
shavers, toothbrush - you name it; nearly every electrical device has a battery
My 2nd door bell. It is RF and has battery at the push button side as well as the inside side.
And I bought a special Christmas light kit with LEDs and no wires. Each LED has its own battery and all controlled with a remote control which has battery.
The door from garage has a remote control with battery.
OK - maybe that list could be trimmed a bit down to a usable size.

I think the devices (or their batteries) could be sorted into (xxx) groups:

1) Critcal devices where dead batteries would pose a severe risk, i.e. smoke and CO detectors.
These devices should be cecked regulary for battery and function, i.e. monthly (Usually they nag automatically if the batteries go low)

2) Devices where the battery is used interactively on a regular basis, i.e. the actual TV remote.
If a battery goes low on those devices, it's no problem if a fresh on is at hand. Keep it that way. But the "end of safe life" date may be reached before the battery is empty, so you risk damage of the device if the battery leaks. Put a label on the device that tells the "end of safe live" date w/o opening it. Inspect label from time to time.

3) Devices that are seldom used but battery powered, i.e. some measurement device you need only twice a year or seldom used remotes. Remove the batteries after use and store central as long as good, but have fresh spares of that type in stock. That saves you from damage thru leaking batteries.

4) Devices with very long living batteries, i.e. the PC BIOS battery.
When buying, inspect for batteries and research for battery lifetime. Put a label on the device that tells the "end of safe live" date w/o opening it. Inspect label from time to time.

5) Devices with accumulators that are used regulary.  There's no need for regular checking - you'll notice when it's bad.

6) Devices with line power and backup battery/accumulator, i.e. answering machines or UPS devices. There you should check the battery or accu health regulary for charge and "end of safe life" date.

Besides of that I have to repeat me:
Sweep thru the place, make a list for every room, sort by the categories above. If to be checked regulary, note next check and interval in the list. Make a copy as "checklist". Keep the list up-to-date and add / remove items when the enter/leave the place.
Cordless phones and cellphones, torches, portable media devices, game console controllers, clock radio alarms ( backup batteries), laptops, garage door openers, car alarm remotes
these are remotes...
How about rechargeable power pack batteries, usually lead acid, from solar panels home system?
i think it's about time we got some more specific from 25112 regarding what he just wants

**don't forget cardiac batteries to keep your heart going - THAT is what i call something to be changed on a regular basis
25112Author Commented:
very thorough and a great list. thank you for this reference check.
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