This question occurred to me over Shabbos, when my clock fell over. What Muktzeh category does a digital alarm clock fall into? If it has a backup battery, does that change anything?

Additionally, if it has a back-light, does that bring it under the same category as a lamp, or is its "lamp" function "batel" to its clock function, which may be under a different category of Muktzeh?

  • If you leave the clock alone, I can't see any problems. I don't follow what you're planning on doing with the clock and what the concern with the backup battery is. – DanF Oct 22 '17 at 3:09
  • @DanF To move it back to its upright position, so I can see the time. But it made me curious as to its general muktzeh status. The backup battery may itself be muktzeh, and if so, possibly make the entire clock a "basis" to it. – Ploni Oct 22 '17 at 3:15
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    This should be relevant Moving Electrical Appliances on Shabbos – mbloch Oct 22 '17 at 3:30
  • Why would it be Muktzeh at all? Why is this different from a digital wristwatch that also has a battery? One is allowed to view the time on Shabbos. (Note that I'm assuming this is a standing clock. If it's a clock that hangs on the wall, there is an unrelated issue of hanging stuff on a wall, which is not related to being an electrical appliance i.e. it's forbidden to hang a picture on a wall) – Salmononius2 Oct 22 '17 at 14:18
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