When will we see solid state deep cycle batteries?

[Bandersnatch]

Lots of discussion right not about solid state batteries in vehicles. I also believe I saw them starting to come to high end small electronics. Will this tech be coming to trolling motor batteries anytime soon?

[Tennessee Boy]

My prediction,  or maybe just a wild guess, is the next big thing in battery technology will bring lower costs instead of higher performance.  I’m thinking sodium ion batteries that have the potential to give us LifePO4 level performance at a price lower than current lead acid batteries.