In article . com,
says...
Hi All,

I have 6 smoke detectors at home, and noticed that 4 of them had a
blinking green light. I thought the problem was battery, so I got some
brand new 9v batteries and replaced them on the 4 blinking ones.

Are you sure the builder didn't leave the owners manuals around
somewhere? I'm the second owner, and I don't think I have the manaual
for my smoke alarm, but I do have the manual for the bathroom fan, the
range hood, the water heater that was first in, the furnace, the AC,
plus all the appliances the first owner bought.

Maybe your manual is somehwere in that stack.