Well, I have a HP 15 db1069au and I had upgraded to a NVMe SSD and replaced the battery. If you wanna do that, look out for the following things:
# The specific battery model is HT03XL. I am not sure if other models of battery will work on this work.
# Upgrade your SSD: Look for an NVMe SSD with a minimum capacity of 256GB. This HP laptop supports only upto 2TB
# Are you planning to reinstall Windows on your SSD? If so, buy a Windows 11 product key from a reputable and reliable seller.
I hope this helps.
Thanks!