Using the double declining balance method of depreciation (common in prorated warranties), the battery you bought for about $80 is worth between $5 and $2.50 today.
Hardly worth mentioning.
End of 1st year: $80 x .5 = $40
End of 2nd year: $40 x .5 = $20
End of 3rd year: $20 x .5 = $10
End of 4th year: $10 x .5 = $5
End of 5th Year: $5 x .5 = $2.50
Depending on where you live, 5-years could be all you would get from a battery. I'm in the Pacific Northwest, between our mild climate and my low miles, the original battery (7 years old) in my '04 Infiniti is still going strong.
I agree about the warranty being basically meaningless. Fine print ... yuk!!!
Note that the article is over 3 years old.
Robert - -
There no sense in getting "Ulcers" over peanuts!
Just 'know' or realize that free means just that - - - either hope that a battery happens to fail before Month #36 - -or - - plan on buying another outright .... always has been essentially the case over these past very many years, regardless of whatever Accounting Method of Adjustment might be used!
Only exception I personally know of were the "Lifetime Batteries" sold @ Penny's Auto Chain some ~ 35 years ago now, just before the Bankruptcy ... everett