Theres a company called mightymax that makes SLA/AGM & lithium battery
In 2017 I picked up one of their $28 18AH SLA batteries, this thing is like 3lbs or 5lbs or whatever. And it cranked over my 5.3L V8 9.5:1 compression engine from the trunk better than a normal car battery. And its still in there 50,000 miles later after having been drained completely dead twice from sitting a few months over the last 5 years just beginning to show its age.
I don't think you need to spend so much money on a battery when $28 can do that
*EDIT:
I just checked to make sure I was giving good info and it turns out I have the 26AH battery.
In 2017 it was roughly $28 to $35 shipped but now they are twice the price. Unfortunate.
Might as well go for the 35AH version since its the same price now.
I have a 35AH mighty max I keep in the backseat as a battery jump box. The sealed lead acid 13.05v resting battery is great for jump starts and could easily replace any car battery if the need arises, making it far more valuable than a jump box.