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Battery Pack - Revision A,B,C,D,E, ...

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Front passenger wheel well, on the side of the battery pack. You should see this:

This is a Rev E Battery pack.

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The battery pack has a part number and a revision. Back when the "A pack" "E pack" terminology was coined, everyone's battery had the same part number, so the revision number was all that's needed to identify a particular battery type. Now there are many different part numbers for the battery, each with multiple revisions, so the "A pack" "E pack" terms are no longer meaningful. For example, a 1064362-00-A battery (what would've been referred to as "A pack" in the past) is newer than a 1031043-00-E battery.

See Battery table for a list of known battery pack part numbers.