Thermostat battery life
- Thread starter diy_dude
- Start date
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what type of batteries does the unit have and how long did they last 
Anything over 12 months and you will be doing well.
Take manufacturers figures with a pinch of salt.
I have some that need new batteries every year, whilst others last 2 years (all the same make stat).
Whatever you do, do not use rechargeable batteries.
Take manufacturers figures with a pinch of salt.
I have some that need new batteries every year, whilst others last 2 years (all the same make stat).
Whatever you do, do not use rechargeable batteries.
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If that is something installed by anybody but you, you could well find that it is actually not 2-core and earth, but wrongly colourcoded like it.
Also depends on the quality and the 'sell by' date on the batteries you use.
The usable capacity of batteries decreases as they near the end of their shelf life.
It may be more economical to use two or three sets of plain zinc carbon batteries, expecting to change them frequently, than one set of ultra high capacity gold and platinum plated batteries.
The usable capacity of batteries decreases as they near the end of their shelf life.
It may be more economical to use two or three sets of plain zinc carbon batteries, expecting to change them frequently, than one set of ultra high capacity gold and platinum plated batteries.
It may well be twin and earth cable. That doesn't mean that the brown/red is live, the blue/black neutral, and the bare one earth. Quite often they are wired using the earth as a switched live, which is what bengasman was referring to.
It's very bad practice. You can use the twin and earth for a battery powered stat though, provided you alter the wiring correctly at the other end.
My room stats go for well over a year with a pair of alkaline cells. The relay inside is stable in two positions, so it only needs power to switch it, rather than drawing current all the time the heating is on.
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