HP Notebook - 15-dw1300ng: Battery drain when turned off

[used_username]

Hi HP-ommunity,

I have a HP Notebook - "15-dw1300ng", a middle-class consumer product, when it is shut off (not standby - I did all related settings!) the battery drains within a week from 100% to 0%.  The computer is from 2019, its doing this since new, I am now on the 3rd battery in 5 years due to the constant draining & charging,  even if I use not often the laptop - the costs, waste and time I spent is absolutely not acceptable.
(For comparison: I have also a 16 year old core2duo laptop which is on the 2nd battery which still holds charge over months - because its off when its turned off).
I am a quite experience computer-nerd, I cheked and adapted all available power-settings in the BIOS, energy-options, shutdown-menue,  device-manager for devices that can wake up the laptop etc. - I TRIED EVERYTHING.

At work we are using HP Elitebooks which are good, but this HP-productline is AWFUL and driving me crazy!!!
I read all battery-artciles in the web and applied all solutions - nothing is working.
In between I absolutely hate the laptop, I spent loads of hours to find the rootcause!

Hardware is as follows:
- Intel(R) Core(TM) i5-10210U CPU @ 1.60GHz
- Intel Optane storage management (turned off)
- samsung SSD 256GB + harddisk from seagate 1000GB
- Intel UHD graphics + NVIDIA GeForce MX130 graphics
- battery HT03XL, HP Spare L11119-855

Any idea, what I can do? This battery issue is driving me nuts.
Thank you very much for your help!

Greetings from Germany,
Markus.