>>106813136
Watch this: youtube.com/watch?v=5U0qf1w-hW4&t=357
His wall clock works as long as the voltage is >1V.
Coincidentally, he's got the same multimeter as me and is consumed by the same inane question as you.

>>106813145
To measure the internal resistance you need to apply a highly resistive load to the battery, measuring without a load won't give the right results.
https://www.learningaboutelectronics.com/Articles/Battery-internal-resistance
The XTAR Dragon charger can measure resistance, but I think that resistance is a useless metric in this case.