Hi, based on the appearance of a red warning on the instrument panel, I am looking at replacing the battery on my car. According to the owner's manual there are 2 batteries. Should they both be replaced?
Dealer-wise, what am I looking at to get OEM batteries?
The warning came up when the cold weather hit; the car cranks a little slowly, but starts right up and it's fine once a few miles and a warmup are done.
Based on the age of the battery (ies) though it's probably time to replace it/them. The one in the trunk is an OEM battery; I don't know if it was ever replaced either.
Thanks.

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Providing a home for these cars:
1951 Buick Special De Luxe
1977 Rolls-Royce Silver Wraith II
1970 Rolls-Royce Silver Shadow
1986 Mercedes-Benz 420 SEL
2005 Mercedes-Benz E 320 CDI
2012 GMC Sierra 1500 4X4
1927 Pierce-Arrow Series 80
1931 Pierce-Arrow Series 43
1926 Ford Model T coupe