Costco has the second best warranty
48 months free replacement not pro-rated
And they refund you the core at the same time
So you walk out with a replacement new battery and about $20 in your pocket
Assuming you even need the warranty (my bro let the battery run down and freeze and it popped open)
But… you need to keep the receipt
When you buy the first battery you have a core or you pay $20. When you take it back for replacement, you get a new battery. You don't walk out with $20 in your pocket.
This would be good if 1) I had a Costco near me, closest one is 45 miles away, & 2) if I had a Costco account. I did find a local autoparts store with one in stock for $102 + $27 core. with a 1 year warranty
