I checked my three year old Motorcraft battery (2017 Explorer) because I was having some weird electrical issues and starting problems and found a small mountain of blue powder corrosion. It turned out to be so bad that it ate through the plastic battery case and made the lead post come out with the clamp! It just didn’t occur to me that it could happen so fast... I’ll have to be more diligent about maintenance on my batteries...
I replaced it with a Interstate battery from Costco.
I replaced it with a Interstate battery from Costco.