3-pin LiPo Battery for PiJuice Zero 500mAh (CE06793)

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500mAh Lithium-Ion battery that can be used with PiJuice Zero.

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What is the 3rd pin on the connector on this battery?
Im looking for a tiny, cost effective LiPo, do you have stand alone 5v charge boards suitable for these?

Besides Pi Juice, what other development boards can one use the 3-pin LiPo Battery? Can I use it on this project on STM32: Getting Started with STM32- Arduino code Programming and PCB Design - Share Project - PCBWay ?