I have been having a seemingly strange problem reflow soldering this battery clip. The negative lead always solders fine and looks beautiful, the positive lead looks like it is insufficient and we have had some non-soldered joints --- only on the positive side. The pads on the PCB are within Keystone's recommendations, a bit larger than their minimum size recommendations.
I suspect that the leads are damaged due to bulk-bag packaging (even though they are fairly robust). The positive terminal is less protected by the housing than the negative terminal.