I can't seem to locate the battery that is supposed to somewhere on this older machine. Someone told me it would either be located within the display console or inside the rear portion of the machine. I've opened both but still find no battery or leads that would indicate a location. The console's circuit board has (3) plug-ins but only one has a plug attached to it (leading back to the rear of the machine.) The machine functions well except for the annoying habit of the display turning off whenever you pause, even very briefly, in the midst of a workout. Any help is appreciated. Thanks