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Yes, CY8CKIT-062-BLE PSoC 6 BLE pioneer kit can operate from a 3.7V Li-Po battery. Moreover, the battery will be charged automatically when you power the kit using a USB cable.
Great. What is minimum battery voltage, at which the board can still operate?
Is there some kind of warning, when the battery goes close to this voltage? So that user can recharge the battery without the risk of interrupting software running on the board.
Battery voltage must be in the range of 3.3 to 4.2V for the boost circuit that powers the kit to start-up. After the start-up, boost circuit will continue to operate as long the battery voltage remains higher than 2.6V. There are no built-in indications on this kit for battery level. However, you can create one using PSoC 6 device's comparators or SAR ADC.