OEM Panasonic battery type: lead acid or calcium lead

[tcpoob]

the 2005 4th gen came with Panasonic battery 105D31L-MF that served me well. I am curious what type it is

1) conventional and low maintenance , these are lead acid conventional / low maintenance batteries ...
2) maintenance free / AGM batteries: these are calcium / lead batteries ...

So since it says maintenance free, can i assume it's "calcium / lead", not "lead acid" ?

The Panasonic is not AGM , correct? Thanks.