You're right. In 10mV/div it shows almost nothing. Maybe I have some bias from using better siglent scope(not for long, I got it last december), and I have not been using many models. I attached some pics, in 2V/div I pushed vertical position -3V so it is visible on screen.
Interestingly about the software, it seems there are couple of batches for 2102s. From 1.5, 2.4, 3something, to 4.1
and there is none available for download for 2202s, so maybe, just maybe, some of them are just software downgraded and there is possibility for upgrade
And from another bottle, the battery issue some of users descibed, is also present in mine unit, but let's say it is no big deal, just little annoying. Some said that this is scaled well, but from my measurements, when scope screams low battery, there is still at least half of juice in them. Ignoring this message it can work for long long time still.
So it shows a full battery bar until it drops to 3,98V.
Another step(like 2/3) is below 3,89V.
Another(half) is at 3,81V which is quite right.
And it shows almost empty with little red bar, and low battery message at 3,69V when battery is still about half full. It might be 40-60% depending by cell chemistry, but definitely not low
In the end little red bar disappears at 3,57V and battery bar seems fully depleted.
and it powers down at 3,43V. So the scaling could be better definitely.