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Howard-
It's an old clock that needs a main clock.
Thankfully there is an über nerd that makes controls.
Two big batteries feed the radio thing.
And then it needs 24v to tick.
So either power supply or 16x1,5v batteries.
Didn't want to have a cable going to the clock, so now will buy more batteries than I needed in the last 20 years in one go.
Would go eneloop, but they don't really do 1,5v.
c.h.e.
Looks like I'll put 18 batteries into an old wall clock. Something tells me I should have gone for an external power supply.