..one with the posts + -, and the other with the posts - + (looking at the long edge with the posts) - that was confusing enough for the battery buyer. Then they had to go and start putting the posts (connections?) on the sides. Things have gotten more confusing from there.
Still remember my first VW Beetle with the battery under the back seat. No problem until you forgot the fiberboard cover over the battery, and still no problem until someone sat in the back seat. Then the springs in the seat would contact the battery terminals. Saved many VWs from a slow death by corrosion.