Wanted 9v PP3 battery for smoke alarm.

centretap

grizzly1911 wrote: »

I use a rechargeable PP3 in ours. lasts a lot longer, 1 year plus, than I was expecting.

Personally I wouldn't use a rechargeable battery in any low drain equipment such as smoke alarms and remote controls. They aren't designed for that, but rather for high drain equipment such as torches, motorised toys, etc.

For low drain devices alkaline or zinc chloride should be the batteries of choice.

paddyrg

Procell are generally excellent - designed for industrial/commercial use (used extensively in entertainment/TV industries for instance)

wazza

have ordered some procell pp3s. Will keep you informed how they perfom.

Thanks for the replies

grizzly1911

fwor wrote: »

I've heard it said (though never from an original authoritative source) that this is not recommended, because of the "off the edge of a cliff" discharge characteristics of rechargables.

Alkaline cells have a much flatter discharge rate as they die, giving the smoke alarm plenty of time in which to do the annoying bleeping...

I am aware of that fact - believe me my alarm gives plenty of annoying beeps before it dies.