Here is a little stand alone mount / case for a small Voltmeter - I use the chart in the graphics above to manage battery charge state. Read the voltage with NO LOAD on the batteries, once surface charge is bled off. (Run something for a bit, turn it off, then test...)
Here is the meter on Amazon:
New Mini 0.36 3 Digital LED Display DC 2.5-30V Red Volt Voltage Meter Voltmeter by Eachbid https://www.amazon.com/gp/product/B00P7QC8PW/ref=oh_aui_search_detailpage?ie=UTF8&psc=1
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