Gossen Battery Adapter Set V207A. The battery adapter replaces the two discontinued mercury oxide button cells V625PX or PX13 with two silver oxide button cells IEC SR 43, and it adapts both mechanically and electrically to the characteristics of the original batteries. Please use only silver oxide button cells IEC SR 43, for which the battery adapter is designed. The battery adapter is suitable for Gossen light meters Lunasix, Lunasix 3, Lunasix 3S, Luna-Pro, and Luna-Pro S. Package includes: battery adapter and two IEC SR 43 button cells.