Battery for a vintage VOM

See, you had a analog PWM controller, and did not even know it.

My ME 77-C/U's, take a 22.5V battery about the size of a 9 volt battery, only for the highest resistance scale, So not having that battery, only cuts out one function of the meter. Not worth the outrageous cost of the batteries. I have considered using a 9V battery, along with a Buck Boost converter to get the volts up to the 22.5V.
 
On the Beavis and Butthead end of this conversation, I was once a young marine, tasked with cleaning out a supply room. A large box of typical 9v batteries (green, of course) were plugged directly into one another, to make a new, single battery, somewhat longer than my forearm. When shorted with a couple wires... it was impressive.
 
Superburban said:
See, you had a analog PWM controller, and did not even know it.

My ME 77-C/U's, take a 22.5V battery about the size of a 9 volt battery, only for the highest resistance scale, So not having that battery, only cuts out one function of the meter. Not worth the outrageous cost of the batteries. I have considered using a 9V battery, along with a Buck Boost converter to get the volts up to the 22.5V.
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Great out of the box thinking!
 
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