Connecting LiPo battery to MKR1000

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This might be helpful, first thing that turned up in a Google search for

'arduino mkr1000 battery'

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The MKR1000 seems to have an onboard MCP73880 LiPo charge controller.
Charge controllers have many safety features.

No discharge feature there, so you might have to measure battery or VCC if you need that.
Leo..