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Tap mode, it will bring up a screen with the date and time on it.then hold reset. The lock will start blinking and then disappear :) It looks like you guys are probably done with this watch but I thought I'd answer anyway. Good luck.
Yes, you definetely need battery replacement. As the hart rate monitoring is most sophisticated part of the device, it has more IC (Integrated Circuits) than any other features. More IC's means more power is needed, so, if the heart rate monitor is starting to malfunction, that's the very first sign of underpowered battery. Find your nearest watch repair shop and ask for battery replacement.