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Could you provide more details about the case? Are you trying to power it on without charging, or the charging process couldn’t be started? If it is only about charging then your battery is probably dead and should be replaced.
Therefore, you can still use your device with about 50% of battery capacity. To charge it properly after long period of time you need more than 3.3 V on Li-Po battery. If it is less the charging will never start. To overcome this situation you need to rise up the voltage of battery by cooling it (place wrapped in paper towel in zip-bag in refrigerator for 2 hours - do not try to turn on your watch but charge it ASAP).
I hope it is the case.