That looks like a really nice solution, compact and easy to use. It might still not fit on 17mm and smaller drivers, but it’d be really nice on bigger ones. On smaller drivers, it might be necessary to spread vias out over a wider area, wherever they can fit. It’s far less convenient to use, but still better than having to unsolder things between tests.
Any idea whether your black Liitokala is genuine or not, assuming there is fake Liitokala 26650 cells now??? Do you remember roughly when you ordered your Liitokala? And if you have an analysing charger, do you mind checking the capacity of your Black Liitokala 26650 cells?
I was all set to order a pack of 4 Black Liitokala 26650 cells from them till I noticed several more recent posts suggesting Liitokala Official Store on AE also sells fake non-Liitokala cells, so I am starting to wonder if they sell fake Liitokala cells too??? See post here today by ledoman indicating their Panasonic NCR18650B are fakes! Here is another post by Barkuti indicating he has received fake Samsung 25R cells from them as well.