AFAIK, Champion batteries are made by Clarios. This Everstart Maxx from WalMart is also made by Clarios, and is currently $160: https://www.walmart.com/ip/EverStart...0-CCA/20531541
Walmart also has an Everstart Platinum AGM that has a 4 year warranty for $180: https://www.walmart.com/ip/EverStart...-CCA/753187272 Hard to beat that.
If you have a Sam's nearby, they currently have $20 off Duracell automotive batteries which are made by East Penn. The standard H5 is $120 and the AGM is $180 (both on sale).
FWIW, I just got some LiFePO4 batteries for my boat and noticed that the 14lb starting battery I bought is in an H5 case. I'd think it should work for the E46 M3. https://lithiumhub.com/product/12v-4...arter-battery/
Walmart also has an Everstart Platinum AGM that has a 4 year warranty for $180: https://www.walmart.com/ip/EverStart...-CCA/753187272 Hard to beat that.
If you have a Sam's nearby, they currently have $20 off Duracell automotive batteries which are made by East Penn. The standard H5 is $120 and the AGM is $180 (both on sale).
FWIW, I just got some LiFePO4 batteries for my boat and noticed that the 14lb starting battery I bought is in an H5 case. I'd think it should work for the E46 M3. https://lithiumhub.com/product/12v-4...arter-battery/
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