For better or worse they are here.
Sodium Cheaper than lithium and better in cold temps.
Lithium greater energy density but not by much.
The below model would be a good fit
MODEL: Na25XP Ah: 24 weight: 6.8lbs CCA-650 PCA-1300
Dims: 192 x 130 x 170 Lead acid replacement Term's: M8 $550
https://www.aerolithium.com/batteries