What battery is this !

As a side note I think where some confusion may be coming from is that Hankook used to do an AGM battery of similar size/capacity with the same model number (M31-950):


I can see what looks like physically the same batteries with the same model number/capacity/CCA at some very fringe sites which very little info - but often described as "maintenance free" which is generally only used in advertising with flooded batteries.
 
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