car service question

Ok it is not a bike but this is a good group. My 2019 Ford Escape needs new battery it is the original. No trouble but going to replace due to age voltage on meter says 12.4 a but under but ok.
I also need an oil change. I generally use the quick lube place down the street but one stop seems to be the easiest.
I made an appointment at the Walmart I go to for groceries. I am a bit dubious of Walmart for auto stuff but frankly they could be just as good was anything else. There batteries are way cheaper than AutoZOne and Orielly.
So did I make as mistake should I have gone to a regular car service center. My Escape runs fine only 30K miles on it.
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Deacon Mark