Question HP Probook 450G8 43% battery drain after being shutdown for 2 weeks ?

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My laptop is HP Probook 450G8, equipped with Win10, manufactured in Sept. 2021, purchased in Nov. 2021.

Recently, I noticed a quick battery drain after entering S5 (Soft Off) state. After charging battery to 100%, I turned off my laptop and left it in S5 state for 2 weeks. When I turned it on again, it showed battery level at 57%.

To my knowledge, there is nothing needing power supply from the rechargeable battery in S5 state, maybe except power button. So I think that the 43% battery drain is self discharge, which is too fast to acceptable.

Is 43% discharge normal after 2 weeks of non-use？ Or is there some hardware error?
What if I disassemble my laptop and leave the battery alone? Will the drain rate be still close to 43% every 2 weeks?

By the way, I've noticed battery drain in S5 state when just purchasing it. But I forget the specific drain rate and only remember that it's faster than 10% per week.

 

[Lutfij]

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which is too fast to acceptable.
You're well into a year with the laptop. It's beyond the return window...

You could try and perform some steps as a workaround to curb this power drain. One of which is to see if your laptop is pending any BIOS updates. I'd try and work my way up to the latest BIOS version if you have a number of updates to reach the latest BIOS version, as opposed to jumping to the latest version. The other thing you could do is to see if your OS is pending any updates. Often times the OS that comes shipped with the laptop/device tend to be corrupt and cause anomalies with power figures. The other thing you could also do is see if the behavior is exhibiting when your laptop is turned off entirely, disconnected from the wall and left as is until you charge it again.

A healthy manner of charging and discharging the battery on a laptop is to charge to 100% then discharge(with use) to 10% and continue to do so for a number of cycles. Don't plug the laptop to the wall to charge the battery and forget about it.