Available battery voltages Updated 2025-07-16
Ciro Santilli's hardware House 2018-01 Fire alarms Updated 2025-07-16
Kitchen: 2021-04: nine-volt battery battery at 8.79V. Not sounding.
Ciro Santilli's hardware House 2021 Fire alarm Updated 2025-07-16
2021-08 bedroom battery out, 7.29V out of 9V duracell duralock. Buying pack of 12 Energizer nine-volt batteries. Measurement on new battery: 9.68V.