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
Best warranty is Interstate
Every battery has a serial number they track
They know if it’s covered or not
No receipts needed, they don’t care how many times it may have switched hands
I have used their system to get coverage on junk yard batteries that were still in warranty period.
