4 years out of cheap batteries is pretty good I've got some car quest that are only 2 years Old and they are bad
Optimas are NOT what they used to be,,pretty much crap these days,my Walmart batteries lasted 6 years ..much better than my yellow tops,never buying overpriced Optimas ever again,all hype now day,capitalizing on their OLD reputation,
I used to use Optimas back in the day.
A single Group 31 1150CCA Odyssey 2150 does the job for me these past few years.
I installed them 12/12 @128K miles.
4 years and only 13K miles.
Could have....should have been a bit longer. But cheap is cheap.....
Exide makes the John Deere batteries but I don't think they are as good as they once were