MR-9 Battery Adapter for Film Camera & Exposure Meter / Mercury MR9 PX625 PX13 MR-9 PX625 PX13 battery adapter for vintage film cameras and exposure meters. Use of 386 / SR43W Silver Oxide battery (1.55 V) to convert voltage to be equal to obsolete MR-9 PX625 PX13 Mercury battery (1.35V). Employ new microchip to match both electrical and physical requirements. Same size as original MR-9 PX625 PX13 Mercury battery in all dimensions. High quality gold-plated brass body and copper contact for lifetime reusable. New product with 1 year warranty. Price is for an adapter only.