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Nuclear engineer
02/2012 X5 35d M57Y CPO 110K miles NOKIAN WR G3 25K miles
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Yeah ... RealOEM.com. Get the part numbers and specifications there and search for the part numbers at a parts house.
 
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The larger AGM battery is either a 49/H8 battery class size which is usually a 90ah, 92ah, 95ah, or possibly a 100 AH battery (if regular wet lead acid battery)...or you can go with the larger AGM 95R/H9 battery class size (If it can fit in your battery space) which is usually a 105ah or 110ah battery...depending on brand name.

The smaller battery is hard to find but it is a 140R/H4/LN1. The last time I was in a thread discussion about this smaller battery...it was found on the Rock Auto website. It was an AC/Delco brand as well as an AGM battery in the 140R/H4/LN1 size (the regular lead acid "wet" battery in this size is easier to find...the AGM is the hard one to find).

You can see the battery specs (power and dimensions) in the East Penn Battery chart below. Other brands may have specs that are slightly different (they vary by small amounts)....but the dimensions are pretty much the same across all brands (length/width/height).

1011946
 
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