All OM-4 models have the old, battery draining circuit board. It is possible that Olympus replaced the camera's board if it was brought in for repair. You can easily check whether or not your OM-4 has the updated board. Switch to battery test mode. If your camera starts beeping your batteries are good. Wait for about 30 seconds. If the beeping stops you have a OM-4TI in disguse. If the beeping does not stop you have a original OM-4