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Right, you got an AGM.
A regular group 94 flooded battery made by Deka or Johnson Controls from a parts store will be far less.
IIRC, I paid ~250 for a deka grp 49 for my 318 a few years ago, and the smaller (94, IIRC) for my saab, also AGM was a bit less than $200. So not a bad price.
Apparently the Autozone platinum is AGM, not sure how it is priced.
You did the right thing to reprogram for the AGM. I wouldnt swap one in willy-nilly since they do need a slightly higher voltage. That said, they are working well for MANY years on my non-smart 91 318i and 04 saab 9-3...
AGM is smart IMO for a trunk mount application...
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