Thank you Randyretired. When my lead acid battery is rated at 850 CCA and the lithium I'm looking at is rated at 900 CCA, I tend to lean towards the 900 CCA for starting my V10 gas engine. My motorhome has @14k miles on it and is a 2017 so it seems it cranks easy enough with the 850 CCA but I want the lithium for lighter weight/longevity/ and reliabity.. Appreciate your response and input.