You don’t understand how the heating works. It does not use battery power to heat. The heat is only when the charging source is high enough and it won’t let the battery charge until it is warm enough. It helps to understand how something works.
Like this? https://ca.renogy.com/renogy-12v-100ah-smart-lithium-iron-phosphate-battery-w-self-heating-function/?gclid=Cj0KCQiAhMOMBhDhARIsAPVml-EiiMFJcNnsQK8bG6OLBlSp-babqFdsIxRJcwvsdqGftm2SrEEyP8EaAo3LEALw_wcB
$120 including shipping to US or Canada
Garmin BC35 Wireless Backup camera.
480p, 15 fps
160 degree wide angle view.
Garmin fleet™ 770/780/790
$520 (USD) including shipping to US or Canada
It is a cycle life question. If you are not cycling the batteries much then there is no justification for the extra cost of lithium. If you are cycle killing a lead acid within a few years, then lithium makes sense. It is all about your planned usage.
There is also no justification for AGM...