Which laptop do you have? I'd like to keep clear of it and its manufacturer when I'll have to buy a new one. My nearly 8 years old ZBook from HP loses maybe 3%

Which laptop do you have? I'd like to keep clear of it and its manufacturer when I'll have to buy a new one. My nearly 8 years old ZBook from HP loses maybe 3% per hour with 32 GB RAM to keep powered. It was much less with 16 GB. Don't you have a 128 GB laptop, right? More seriously, did you check if people have the same problem with that laptop and Windows? Or some firmware update from the manufacturer to fix the battery.