I bought a big RV battery from Walmart for around 100.00 last year. Two year guarantee. I use it for my inverter in my Trailer too

1970 Duster
Edelbrock headed 408
5.984@112.52
422 Indy headed small block
5.982@112.56 mph
9.42@138.27

Livin and lovin life one day at a time