Did you manage to send it?
If not - try to open the watch, disassemble carefully and check the battery voltage with any voltmeter. It should be 3,7 V or more. If nothing is detected - unroll the packaging foil and bypass the charging regulator. Plug it to the power supply - set it to 4,2 V and ~0,4A and let battery charge for a while. After charging - connect the power supply to the Lipoly cables to sort of electronically unlock it (If the battery goes own below specific voltage, charging regulator cuts-off any external circuitry - your watch in that case). If it still does not work - search for the battry code on alibaba or and other chinese supplier for this battery or simillar. The code is something like 553555, which stands for dimensions(widththicknesheight). Probably one you would find might be similar eg. 554455, but you can freely take it, because it should fit and would provide you with approximately 30% longer battery lifetime.