Particle PWRSHLD Photon Power Shield Contains Battery, Charging Circuit Make Your Photon Portable
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<b>[Product Information]</b><br>
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<li>Based around the mcp73871 battery management controller</li>
<li>This shield ships with a 3.7V, 400mah li-po battery and headers</li>
<li>Use USB or an external dc power supply or solar-cell to charge the battery</li>
<li>You'll also be able to monitor battery levels using the photon itself</li>
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