I got the new battery and it does work as expected. With 4G/Wifi + VPN constantly on during daytime and off during night time I get ~1 - 1.5d. So I would expect around 2d if I’d switch internet off while I am not using it. Most importantly there are no sudden drops anymore.
Hope that helps you guys. Let me know if you have more questions.
Addition: Maybe the #batteryguide could help some of you as well …
Ben Im not an expert but the sudden discharge is a known symptom of end of battery life, even more so if you tried the suggested workarounds with no success.
If I were you I d order a replacement.