Did you bother reading the rest of the topic?

I also prefer industry standard AA/AAA/C/D devices because the cells are inexpensive, readily available, and you have more options. You can choose whether you want rechargeable or not and get to select your preferred rechargeable technology and capacity (NiCad, NiMH, NiZn, low-self-discharge or not, etc.). It's not as convenient for charging, but at least you've been able to get replacements for decades without having to pay $600 for a proprietary battery, if it hasn't already been obsoleted.

I recall the TI-86 had 96Kb of RAM. Not sure how much was usable. So TI already had experience in modifying their OSes to support a little more RAM.

I wish TI would have taken the plunge and given it some more RAM.

The TI-86 had 128 KB RAM, of about 96 KB was user-accessible. In addition to system usage, there was about 7 or 8 K (something like that, I think) at a fixed location reserved by the OS to copy ASM programs to and run them (so programmers didn't have to worry about relocation), and there was an entire 16K page which was mostly unused (the OS mostly used a tiny piece of it for expression stacks and temporary storage). Many ASM programs made use of that page for temporary storage.

I think the VAT also had a page all to itself, which might partly explain why there was so much paging and performance overhead while accessing and running BASIC programs and variables (not to mention that any of them could cross page boundaries at any point, and the OS had to constantly take that into account). But, hey, you got a lot of space to work with in exchange.