On German E-bay a new photo (for me) from Schneider M1 - As de Coeur 1 - n° 61xxx. Tank commander : Lieutenant Poupel Sous-chef de char : Maréchal des Logis Bordenave. This tank was destroy (East of Juvincourt) on 16 th April 1918 (49° 26' N - 3° 54" E) and stayed in German lines.
If the place of this tank in the 2nd Battery is well-known (it's the first one), the tank number is unknown.