Did you try measuring the current drain on the battery?
Some of this old stuff was designed to be plugged into power all the time.
mike

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Well I could'nt imagine that the On/Off switch must remain on all the
time. If it was in a Vehicle instead of in my ham shack who would
want to leave the darned rig on all the time. I use it in the
home shack, and all I did was substitute the tiny 3 v (rechargeable)
cell and gring the +/- leads out so could use Lithium Ion or other
longer lasting rechargeables. You gave me an idea however so will
crank in 5 freqs and leave it on for a few days to see what hapens.
73's and tnx
Joe