(I responded to your other comment already, but just inserting a disclaimer for the broader populus that encasing a lithium battery in resin, while possibly briefly entertaining, is no bueno and potentially extremely damaging to any squishy bits you hold dear on your body. Just covering all the bases, friend!)
Encase it in a block of resin then!
Like so:
Practise with other things first though ofc
(I responded to your other comment already, but just inserting a disclaimer for the broader populus that encasing a lithium battery in resin, while possibly briefly entertaining, is no bueno and potentially extremely damaging to any squishy bits you hold dear on your body. Just covering all the bases, friend!)