You have used 48 months of its 60 months of warranty. Let's say the battery cost you $60. That equals $1 per 1-warranty-month.

$60 - $48 = $12

$12 credit towards your next battery.

Some might disagree, but I usually replace a battery about 6 months prior to the end of its warranty period. There are more stories out there about battery failure around the warranty expiration than there are for a battery lasting 1+ years past its warranty.

Batteries are not terribly expensive when bought on sale and if you use Consumer Reports, you can get an edge on what seems to be the better buy performance wise.

Some stores, like Walmart, won't challenge a warranty return that is near its end. They still make money even giving you the credit, it builds good will, etc. Prorated warranties are more about keeping your customer than anything.

Good luck

__________________
S, J.R. Brown
2000 G500 LWB Obsedian Black
2005 Toyota Tacoma Access Cab Off Road Sport
1993 Volvo 240 Sedan Anthracite
1980 450SEL Champange (owned it for 15 years. Great car)
1986 280GE LWB Anthracite (Sold it and kinda wish I hadn't)