Hello friends, i want to start a project and i need some informations about the connectors. I dont get my jolla phone yet, this is why i need your help

I buy a Motorola RAZR MAXX Accu (EB40 - 3200mHa).
Want this builed in my second TOH Backcover.

i hope you guys know the information, or can find out them

is it on the picture the connection to plug a extended battery? If yes, wich one is + and - ?
and i need the dimensions from the connector, if some one have little bit time to check itfor me?