Help please with battery going flat when powered off

BastienSS07

My Asus Vivobook S14 K3402 laptop consumes an 80% charged battery in about 1.5 weeks when powered off.
Its only used for displaying art work and can be off for a few weeks by which time the battery is most certainly flat.
I'm worried for the batteries life as its not good for a Lithium battery to go flat and is especially bad to leave it flat for a long time.
And this is pretty inconvenient.
The battery app shows it losing significant % of power every day and when it goes flat even the clock stops! The time isnt lost, it actually stops at the time the battery went flat. I need to update it before the laptop is used for fear of ruining time logs.

I've been through the usual suspects and havent found a way to prevent it happening.
Things I've changed:

. Turned off hibernation.
. Prevented it going to sleep.
. Disabled fast boot in the OS and BIOS setup.
. Shutting down with command prompt: shutdown /s, to be sure it does properly shut down.

Battery log:
13/03/23 22:45 79%
15/03/23 21:35 62% = -8.5% per day
18/03/23 20:15 39% = -7.5% per day

Does anyone have any ideas how to stop it being so parasitic?
Thanks. เล่นคาสิโนufacasinoขั้นต่ำ10บาท

ps
OS is Windows 11