What I changed / upgraded:- I changed the SSD drive with a nvme recovered from my previous laptop- I added 8G of RAM from my previous laptop for atotal of 16G- lots of videos on Youtube how to open and upgrade, open, clean and maintain. Simple stuff.- ONE problem: because of the m.2 SSD drive, there is no space left for a 2.5in standard drive tray. You would have to buy a smaller battery. What I did to mitigate this: I removed the 2.5in SSD drive from its enclosure, bought a SATA cable that fits this laptop ($7 on Amazon), and basically installed the SSD without its cover. Works without a problem.It looked a bit dusty inside when I opened it, so I cleaned it carefully. Cooler fan was clean already. The battery had a piece a paper glued to it with a hand written number.So far:- excellent performance for normal computer use. I don't use it for gaming. Everything is lightning speed, from downloads, videos, documents, streaming etc.- Battery life seems very good. I didn't expect that, but I holds charge for hours.- I like the complex and easy to navigate BIOS compared with my Acer laptop.For the price I paid - less than $200, I am more than impressed.