Re: Synchronome battery life
I can’t comment on power consumption as I run several clocks from a float charged battery (multiple C sized NiMH cells - now about 15 years old) - but 280 mA is on the low side for a Synchronome. 300 - 330 mA is more usual. Low temperature will reduce battery capacity, though I don’t know by how much, and will also increase internal resistance, but I doubt this would be significant at approx 300 mA.toggle quoted messageShow quoted text
The rod is Invar, which has a very low temperature coefficient of expansion. The iron bob will have a much higher coefficient of expansion. Atmospheric pressure is also a factor.
My own Synchronome sits in a relatively constant temperature and has a lead bob. Variation (per day) is low with temperature change, typically 10 degrees Fahrenheit fall increases the clock ‘rate’ from approx 0 seconds per day to +0.3 second per day, but this is a very approximate measurement by simple visual observation against a Junghans radio controlled clock as reference (and averaged over a week rolling average).