There are some inexpensive battery monitors on Amazon. They're bound to be better than the little bitty one Cal just got. here's one:

https://smile.amazon.com/exec/obidos/ASIN/B01JOUZELG/themotherofal-20

The shunt isn't rated very much more than the maximum draw of Cal's motors, so a more robust one of the same mV rating might be needed:

https://smile.amazon.com/exec/obidos/ASIN/B07MNVZN7Z/themotherofal-20

Another possibility is to use a gauge that uses a Hall effect transformer to sense the current:

https://smile.amazon.com/exec/obidos/ASIN/B073W6453F/themotherofal-20

I'm not endorsing any of these products. Just showing some of what a quick look-see on Amazon turned up...

--
John <jkohnen@boat-links.com>
Missionaries, my Dear! Don't you realize that missionaries are the divinely provided food for destitute cannibals? Whenever they are on the brink of starvation, Heaven in its infinite mercy sends them a nice plump missionary. (Oscar Wilde)


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