Battery operated stats have some form of self latching relay. So that it only takes current when changing state. This requires a highish current at the correct voltage, compared to the microprocessor. No such thing in a remote control.
It happens that John formulated :
No need to - the current draw for the displays is insignificantly low. Consider how long your LCD watch runs for on a tiny button cell.
On Fri, 05 Feb 2010 10:19:40 +0000 (GMT) someone who may be "Dave Plowman (News)" wrote this:-
It would add to both. I don't believe it would add considerably to either.
Untrue. One simply puts in fresh cells.
Is that a particular problem?
You appear to be confusing what one might call deep cycles, where the cell is largely discharged, with slight discharges. With NiCad cells and deep discharges your point would have some validity.
So no longer has the rechargeable feature you desire?
Yes. A low battery warning tells you to do something before the system fails.
On a programmer, the backup battery is permanently on float. It only is needed when the mains fail. If converting an old mains stat - where there is a neutral for the heater coil - to a modern one which has your battery charged via the mains, it will often have to run for the majority of the day without mains. And a maker would use a very much smaller battery. The backup ones in a programmer only last a few days rather than the year plus the alkalines last in a programmable stat.
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