Frank wrote:

On May 7, 12:30 pm, " wrote:

On May 7, 12:29?pm, "Robert11" wrote:




Hello:

Have been buying a bunch of those standard 9V batteries (a few different
brands) over the past few months, and have noticed that instead of 9V they
have been measuring out, with a VOM, at around 10.0 to 10.25. ?This is under
no load.

Anyone else notice this ?

Was wondering if this might be the cause of all the problems I've been
having with my fire alarms
giving 3 to 4 chirps, around once a day ?

It's probably the same type of chirp signal that the unit gives when the
batteries are low.

Thanks,
Bob

I doubt thats it, under load the voltage drops fast,

Have you blown the fire alarms out with compressed air....

They might be overheating



Don't believe voltage changes with load. Amperage is number to
deteriorate.
Electromotive potential determines voltage. If you open up a standard
9 volt battery you will find 6 1.5 volt batteries in series.
Battery's voltage will depend on materials it is made from. Alkaline
batteries will vary from the standard 1.5 volts of old carbon/zinc
batteries.

Hmmm.,
Trying to reinvent Ohm's law?