The cheapest good battery in the US is sold by Sam’s Club and made by a reputable manufacturer called West Penn and sold under the name Duracell. They are built for golf cart use and last many years in my RV. The last ones I bought still had full 215 A-h capacity after 6 years. They cost less than $100 USD so for $200 you can afford to replace them every 6-8 years. Top them up with distilled water once a year and you will be happy, happy, happy. Don’t over think it or go down the battery rabit hole unless you want to be confused.