Battery Testing Reading - What Is It's Integrity?

[Oka]

Just playing around with my batteries.
Could someone please educate me on the electrical side of technology?
What could you tell me about the status of this battery?

Thanks

[Willy]

The readings indicate that both batteries are at their nominal voltage.
The small difference in the readings is not important, possibly they haven't been charged
to the same level, at same point in time or one holds charge longer than the other.
Possibly the difference will move to the other battery if you swap the multimeters.
Further than that, not much can be said about the condition of the batteries.
To really know if a battery is fit you need to perform a current draw and monitor
the voltage during and after the current draw.
PS: batteries are dangerous objects to play with
Willy

[Pennhaven]

Those are minor differences in voltage. Voltage will vary depending on state of charge, which will depend on when and how completely the battery was last charged, and any load on the battery since then. Oh, and also the temperature of the battery.

You can learn everything else you are likely to need here:

batteruniversity.com