[Sephiroth]

Originally Posted by 1andrew1

Lol, suspect the clock is fast.

https://www.quora.com/Is-it-true-tha...es-become-weak

... muddies the waters!

Most wall clocks that run on one AA or C cell use digital circuitry inside that are regulated by precision quartz oscillators.

The oscillators are extremely stable, keeping accurate time pulses that move the clock hands one tick every second. and the accuracy is such that it gains or loses just a few seconds per day… typical accuracies are 20 seconds or so out of a million seconds. This can be caused by temperature changes and by voltage changes/fluctuations.

So for the purposes of most people the quartz will maintain its accuracy until the battery dies, within what a human can tell.

Still if the battery is at the very end of life the inaccuracies might conceivably go as high as 500 parts per million - ten times its normal range of inaccuracy (about a minute per day) but not noticeable to most any human, and the clock would just stop real soon afterwards. And there’s no telling if it would be faster or slower.

Now, with precision electronics instruments I have, sure I can easily see a crystal that far off. But you’ll never notice it. By the way, battery operated watches have the same circuits in them… same behavior.

So the answer to the question is:

It might lose accuracy when it gets very low battery but the amount is so small you probably can’t tell at all you cant predict slower or faster