This is the model I have, and I don't even how it could be better. https://www.aliexpress.com/item/1005005654088891.html?spm=a2g0n.productlist.0.0.7f6a6010ZrOgBF&browser_id=2c05aeec773d47d9900cc41be8da6f78&aff_platform=msite&m_page_id=caeecddccbedaf18a210b0eef8060ead61bf16583b&gclid=&pdp_npi=4%40dis%21EUR%2161.14%2122.8%21%21%21472.89%21%21%40211bec8616927714996103990d07a1%2112000033917999856%21sea%21FI%210%21A&algo_pvid=9ab58c4b-a8fe-405a-9b8a-7f9935b1ef70&_universallink=1&m_page_id=caeecddccbedaf18a210b0eef8060ead61bf16583b
Some 1,5 years ago I checked this item last time and it was around 80 USD so the price cut is massive.
Sounds quite complicated issues. Did you try with any other distro?
Your battery removal doesn't cause any of your problems. I've used multiple laptops without batteries long-term (even for years) with zero issues.
If any other distro doesn't resolve your problems, I suspect your motherboard is either corroded or has broken components on it.