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,* Do not apply power to your Raspberry Pi 4 via the Type-C socket of Raspberry Pi 4.
* Please use high quality power supply, the low quality power supply will generate surge Voltage, which will damage the board chip. we recommend Panasonic brand NCR18650BD 18650 lithium battery.
* If 【CHG】 pin is OPEN, battery charging will be started after powering on(short press the on-board button to turn on) and stopped after powering off(press and hold for 2-3 seconds to turn off). If 【CHG】 pin is SHORT, the battery will be automatically charged once your power adapter connected. The purpose of adding the 【CHG】 jumper is to extend the life cycle of the battery by reducing the number of recharges.
* Be sure to power off & remove the 18650 battery then wait for 2 seconds when toggle charging mode