I've got this Noco Genius charger
Again, not cheap, but intelligent, 12/24volt, remembers it's setting after losing mains power, conditions the batteries too. I bought it on the strength of having a lot of them at work and being impressed by their thorough idiot proof-ness
https://no.co/g7200
They do cheap/lower output ones too.
My customer uses CTEK MXS7.0's, they seem comparable in price, features and output