Confusing terminology indeed.
I do always like wild chem combos: like a lithium/thionyl chloride battery.
Yes some sourcing issues, though I did see a bottle of thionyl Cl sell on
eBay a few years back. It's a watched precursor in the Chemical Weapons
Convention as it can be used in nerve gas production.
Brian
Perhaps somewhat confusingly, the Mk 46 battery was the main propulsion
primary battery used in the Mk 37 torpedo (and not in the Mk 46 torpedo,
which runs on Otto II fuel). Auxiliary power was supplied by a smaller
but similar but rechargeable Mk 53 battery.