You could use the files from the Particle battery shield, and use those to design your own. That would probably be the easiest way, since the hard work is already done (picking components/connecting them.)
Any specific reason why you want to make a battery shield yourself? I’d rather spend my time on an actual project rather than on building the tools 
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WPA Enterprise support on the Photon/P1/PØ is here! Check out the latest pre-release firmware 0.7.0-rc.1 and setup instructions here:
Looking forward to discussion in the thread over there!
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