I replaced the battery myself last year November, It had been working fine until now....

Last 6 Months, I left my Surface Book 2 on desk and I took my another Surface Pro for to-go. That was why I enabled Battery Limit in the UEFI(/BIOS) settings and limit the maximum charge to 50%.

Yesterday, I disable Battery Limit and let it charge to 100% overnight. But it stuck at 88%. Battery status shows that Battery 1(Tablet part) stuck at 50%.

I've try all that I could think of:

Enable & Disable Battery Limit again

Charge it while completely shutdown

Detach the tablet part and charge it with a Surface Cable alone.

Charge it with USB-C

Charge it while running Linux

Both of the Battery shows healthy in Battery report, not much wear have got.

I suspect it's either the EC on the motherboard or the Power Management chip on the Battery 1 is malfunction, it doesn't disable Battery Limit like Battery 2 does.

It could also be a faulty battery I got But I think you should be aware of this issue.

I've been searching all over for a computer or tablet with long battery life, and a tablet mode or detachable keyboard. I've been wanting to take notes and watch videos in portrait mode split screen while I'm out and about.

Firstly, not even the $800 iPad Pro can do split screen in portrait mode. I don't know why, but I'm not surprised it's something that Apple has overlooked.

So that leaves you with the option to either get a Surface Pro computer with an i5 or i7 processor with a maximum of 4 hours of battery with these Surface computers, OR you get something like a Samsung Galaxy Tab S9 which has an ARM processor and 11 hours of battery, but the problem is that these Galaxy Tab devices are wildly overpriced and OneUI isn't exactly my cup of tea.

Only Surface Pro 9 laptops with SQ3 exist, and these are also (shocking!) wildly overpriced. Of course, the 2023 Microsoft Surface Go 4 ARM model was scrapped in favor of an Intel processor, meaning battery life is out the door once again. Until battery life on these Surface computer is at minimum 6-7 hours I won't even look in their direction.

What gives? Is there any other computer or tablet I'm missing that exists? I don't want to spend much more than $800 or so on a device that I'd only use for specialized purposes; I'd buy refurbished but it's still completely insane to spend any more than that.

Looks like we also won't see the Surface Pro 10 until October.