The battery test is Ok, not perfect, and better if you use the full 4 channels to cover volt drop to the starter
...but I've had issues with the maths/terminology used for the both the standard 2 channel and extended 4 channel test since they added it, so ignore what they call "Volt Drop", as that reports the total voltage "depression" during cranking, not volt drop on either path to the starter motor!
Doing this test, or ANY battery test for that matter, using a battery that is NOT fully charged will ALWAYS be inconclusive, unless it's charged enough to pass all elements, so in reality it's pointless doing any test unless you have fully charged it FIRST!
There is in my view (IMHO !) no substitute for using a controlled load, carbon pile tester/resistive coil, to load the battery to at least 50% ideally 75% of it's stated capacity (CCA) and remain over 8.6volts for 30 seconds, most batteries that were fully charged but have limited life left/dead cells or other physical issues will fail this within 5 seconds, so is a quick and simple test.3 Different Standards for CCA testing! All contradict time to test and minimum Voltage to pass!
The Pico Battery test simulates some of this load using the starter motor to apply load (turning over the engine), but not for long enough or at a stable/sustained rate, but has the benefit of testing (using 4 channels) the volt drop on both positive and negative paths, often the cause of mis-diagnosed starter/battery faults. We have long cable paths on many of our cars and see this more often than the starter motor or even alternator failure.
Like all tests, understanding their Pro's and Con's is essential. A Fully charged battery in this case is CRITICAL !!
We have a template we use in the main program, while it does not give us traffic lights (green amber red) to show a customer, it's easier for us to interpret the raw data now we have done over 1000 tests, although the odd car challenges us to say why it has certain attributes at first sight, and we less likely to miss the subtle detail and tell-tells we are able to spot in the raw data. We too can calculate internal resistances, cable resistances etc, it's only Ohms law!
Only have this old sample picture to hand, but hopefully it shows what's possible (and yes there is an issue with 1 channel, so don't take this as being good, just an ideal !!):