Thank you very much, your reply is very helpful, including the Amazon link.
You have found the right family of Cube Tablet PCs but not my model which might be called a 2-in-1 or hybrid, it is larger and a step up re specifications as it is 10.1 display, 4 GB RAM and 64 GB Storage. I understand this is regarded as on the frontier of size for a (small) Laptop --- it has a good keyboard (optional extra) with 2 USB ports plus another 2 on the Tablet itself. I in fact use it as a Laptop, it is just right for my limited needs. (It replaced a Quantum View, with the same physical size but RAM and Storage the same as the Cube 8, a bit too small.) I think a major contrast with a full Laptop is that as with almost all Tablets it has not been made to open easily).
I have contact with users who have carefully opened their Cube 10.1 to replace batteries and do other things, which is good news but I would get someone else to do if for me if eventually necessary. Five years life for a battery seems reasonable, but not one to two years, so I am interested in the tips on how best to treat the battery, both yours and the ones in the Amazon discussion. I think I have generally been doing the right things, mainly short rather than long charging sessions with occasional long ones, not leaving it on charge especially when it is (near) 100% and so on. A utility called Battery Care is now popping up with advice to calibrate as it has done more than 40 cycles, so I expect to do that shortly. When I first had the machine within a couple of days the capacity dropped to near zero, it crashed and nothing would get it started. So rather like your suggestion of a 12 hour charge I left it connected over night just in case and the following morning it booted OK. That situation has not happened again. (At the precise moment that I am typing this, one of my battery apps has warned me of low charge (20%) and the need to plug in --- and this time it has started recharging right away. If only this happened every time I would consider it perfect performance.)
If the problem lies with the battery, not a fault in software, I am puzzled by the difference in charging behaviour between the Windows OS and Android OS. In addition to the Android OS on my Windows Cube I have a Samsung 9.7 Android Galaxy Tablet; and I find it very striking how both Androids have lots of apps available (claiming) to moderate and reduce battery temperature when there is nothing at all comparable in Windows. Why? It is of course exactly the same battery which has a problem in one and not the other.
