So one of my warrior alarms started beeping (Nowhere near 10 years) and stupid me pulled one down, saw no battery hatch and biffed it. The second one is now beeping and I noticed it mentioned replacing battery with correct type. I used a screwdriver and found a good old 9v inside (Lithium) so would prefer just to get a new battery if I can.
Does it have to be lithium or have specific stats or can I just use a regular one from a store? It seems like a regular 9v should be all good but I'm not 100% sure re smoke alarms and don't want to have a faulty one in the house.
Cheers