Replacing the Battery in a Lexus LS 600h

Good night, dear readers!

So I'm heading home from work, not in a hurry, and suddenly on the dashboard appears something like this:

I've never seen so many lit bulbs at once except when the ignition is on and the engine off. It was scary, really frightening. Previously with my LS, I didn't even notice the Check light; I had forgotten what it looked like. But here, besides the check light, there's a whole string of lights. Luckily, I managed to make it home, though when I turned off the engine, I couldn't start it again. Right away, I felt like an owner of a BMW. It was terrifying. If only we knew what this is, but we don't know what it is…

I asked my friend sas-darm to bring me a Launch after work. When I connected it, I was shocked because there were more errors than system!

And such for four pages!
There was nothing else to do but go home and search online. Many had the same issue which was solved by replacing the battery. Looking at the photo above, I noticed the voltage is 8.6 volts. Well, I thought, hopefully, that's the problem. Just in case, I disconnected the battery terminal and turned off VBB.
Removed the cover in the trunk compartment:

Pulled out the fuse:

The next day I had to go to work on my own power. Started searching what kind of battery to put. Some say it's a GEl that comes stock, others say AGM. Looking at my original Panasonic, unfortunately, I couldn't find any markings indicating its type.

Started looking for replacements through electronic catalogs and selecting something very similar with a temperature sensor since without it the car won’t start.

Chose YASYA HJ-S75D31L. Just like 75-amp one in stock, with a temperature sensor. Yes, quite an expensive option, but there was no other way.

Disconnect my old one. Installed under the left trim panel in the trunk compartment. Access requires pulling out the clip under the mesh.

Installed new one.

Fitted perfectly. Connected VBB, started engine and all is well! No errors at all. For peace of mind, I ran Launch again and put back battery cover.

Also removed temperature sensor from old battery:

It looks like this: