Why don't they made new netbooks in the same form factor? Much more pocketable than the GPDs, which I keep looking at but they're just too darn wide.
Good to know re: BIOS, if I encounter issues, I'll try and find the BIOS update elsewhere.
Every time I have intended to buy from AliExpress, I found the same item on eb*y dispatched from the UK, and quite often for the same price (or a little more), therefore I have never ordered anything from AliExpress. It's seller beware on eb*y, in all my years they have never refused me a refund. I really don't know what the AliExpress refund policy is, but I doubt it's as good. I someone I know had an ebike battery fail within the warranty period, no replacement or refund from AliExpress, and he's been trying for months.
I think it's best to buy original Sony batteries, so that when it fails the board is less likely to shut itself down into protection mode, which it may not wake up from. This recently happened with my Acer laptop and it was impossible to revive. I took out the CR2032 (supposesly clears CMOS), I couldn't find a "Clear CMOS" jumper, the board is a dodo... and as usual it makes financial sense to throw it away, rather than buy a replacement board. Mind you, this can also happen with original manufacturer laptop batteries. My Vaio P motherboard going the way of the dodo would be a nightmare. The first Sony branded battery I bought turned out to have been incorrectly listed, wasn't actually compatible, so I got a refund. The second was the high capacity version and "New old stock". I search periodically on eb*y, because they're usually clearer about where items are posted from, or at least, they make that clearer these days.