That is incorrect. I have several VTC4s-- I think I bought 4-- from last year with a 2015 date code on them. Sony did not stop manufacturing batteries. For a while there, they stopped selling them to the US-- they don't like vapers, for some reason, despite the fact we pay top dollar, cash on the nail-- but this policy lapsed also, probably when they bent over and took it in the wallet with no grease.
Or so I hear, anyway. Let me ping
@Mooch , if he's around. I'm pretty sure Sony still makes batteries. What would they do with all that capital investment sunk into battery plants otherwise?