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+1 for the Watt Meter as highlighted by Steffen.
Have used these little beauties for a number of years, in principle, so I do not take my camping or Astro draw below 50% battery capacity in AmpHours.
I fitted Andersen plugs to both tails which gives the flexibility I need.
For example, I have 2 batteries getting shared solar charging at the moment.
The WattMeter sits inline between the panel controller and the battery.( Source side to solar panel, load side to battery )
When using the battery to run the scope, source goes to battery and load to scope side.
Very versatile and cheep as chips.
Tip, I have anderson plugs glued to top of each of my batteries via inline fuse.
You can do a dark connection without stuffing polarity.
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