[masraum]

You can put a "surface charge" on a battery. If you charge a battery at 13.8V for a bit, it'll show near 13.8V immediately after taking it off of the charger. I don't know how long it takes for that to normalize, if it's a matter of minutes or hours or what.

When you load test a battery, that'll kill a surface charge pretty quick. If you have a load tester that simulates starting a car, one or two tests will normalize the battery (assuming no charging is happening).

I wish cars still came with real Voltmeters, Oil Press, and Temp (water or oil) gauges. I'd pay $300 to swap out my gauge cluster for one that replaces the useless analog speedo with oil press, oil temp, and volts gauges