WeinCell 1.35 volt mercury replacement button cell as used in many older 35mm slr cameras. Ideal replacement for batteries including the Z400PX, PX400, EPX400, RM400, RM400R and V400PX.

• Replaces RM440R and V400PX for Pentax cameras
• Voltage output more stable than alkaline replacements
• No camera adjustment needed
• Wein Cell batteries are not activated until the pull-tab is removed (Remove tab at least 30 minutes prior to use.)
• Environmentally Safe

Compatible with the following Pentax Cameras:

• Pentax Spotmatic I
• Pentax Spotmatic II
• Pentax Spotmatic IIA
• Pentax SP500
• Pentax SP1000.