Quote Originally Posted by SensibleHeatUK View Post
Do check the requirements for other properties other than stated voltage - many devices designed for DC battery operation are very sensitive to things such as voltage ripple, and will give inconsistent readings when powered from this kind of power supply. It’s not unusual to get several degrees of sensor reading “swing” for example. Maybe not too much of a problem if you don’t want close control on something like a hot water sensor and can accept a several degree swing in reading around the “real” measured value, but a major problem when trying for close control especially with room temperatures over a much smaller range. Finding 3v DC power supplies with well smoothed, low ripple voltage are few and far between.
If it's that sensitive to voltage, wouldn't that suggest that it will be a total disaster as the batteries go flat?