Hey
@InvincibleInDN
I would use what Ducati uses for their Panigale V4 S and R. They use a company called Skyrich.
The model number that works for the Diavel 1260 is HJT12B-FP and is a replacement for the stock OEM Yuasa YT12B-BS.
Link
I think this would be your best bet.
I've see YouTube videos with water coming into the anti-gravity battery since the battery is not well sealed plus others where you need to shave a bit of the contact because the hole doesn't match OEM.
Let me know if you can get Skyrich in Australia.
Also if you store the motorcycle for the winter make sure you use a lithium battery tender/charger and not a standard acid/AGM charger.
I'm curious how it goes with the lithium battery as you save 3 kgs, but my battery is working fine for the moment so waiting for it to die before making the change.