The ERR board and the RS-Lite board have the same battery connection, and AFAIK, the same polarity.
Put another way, I installed my YLB into the H10, and it works using the ERR cable.
Look closely at the picture from Bruk's document...
Note the contacts in the battery plug are to the right of center in this picture. If I orient the ERR battery cable to plug into this connector, the red lead is on the bottom and the black lead is on the top. Looks right to me.
A WARNING! There are cables for PS/2 floating around with a 2mm connector that will fit into the battery plug on the RS-Lite board, they are wired in reverse polarity!