Find my Battery generation model

thats it...

Autumnlodge
If it's 2.6, 5.2, 8.2 then it's Gen 1
If it's 9.5 then it's Gen 2
If it's 5.12 or 9.5 and has a curved front it's Gen 3

Here

https://givenergy2025.zohodesk.eu/portal/en/kb/documentation/datasheets/batteries