Finally tracked my LiFepo battery.
Brand Shido and it comes with several screws and a pile of self adhesive rubbers to compensate for the size.

Fits perfect, more firmly put than the OEM battery.

Ample juice too; starts on touching the button.

Not a world of difference bur still 3 kg. lighter.
Forum member supplied image with no explanatory text
Forum member supplied image with no explanatory text