battery connector
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 which one is cathode material of the battery connectors  
 
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 @Zhao-Jun Be careful please - your drawing is wrong. 
 The lower terminal - which is closer to the Expansion Header - is the negative terminal of the battery connectorEdited ->(ie. the "cathode"the anode of the LiPo battery).
 You can check it with an ohmmeter easily - this terminal is connected to the GND.The official Omega2 Pro schematic is also wrong - the battery symbol is reversed Yes, the battery symbol in the schematic is reversed, but this is just a schematic symbol and has no impact on the actual hardware. 
 /@Lazar-Demin/
 BTW I don't have any Omega2 Pro board - the above is my "extrapolation" - because of the battery connector on the Power Dock is same. 
 Please correct me if I am wrong.
 
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 @Zhao-Jun @György-Farkas is correct I have an Omega2Pro and tested it on my meter. 
 
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 @György-Farkas 
 ths
 
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 @crispyoz 
 ths