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The first pit I ever did, and one of the most beautiful places I have ever been:

How to check 18650 caving light batteries with a Multi-meter

I'm making this post so the next time I forget, I have the directions handy.

Set the multimeter to 20 DCV

4.2 volts 100%
4.1 about 90%
4.0 about 80%
3.9 about 60%
3.8 about 40%
3.7 about 20%
3.6 empty for practical purposes
3.5 over-discharged