Mercury battery adapter for cameras For H-2D or 2MR9 (discontinued batteries) Uses two LR44 button cells in series. However, the original batteries (H-2D and 2MR9) have a voltage of 2.7V, while two LR44s in series provide 3V, so please use at your own risk. Materials: + terminal is aluminum, container is PVC, PE (resin) Weight: 3.6g (7.3g with batteries installed) Dimensions: D16.6xL14.7 (with batteries installed) Type: Camera battery The batteries in the fourth photo are not included. Instruction manual included.