Confirm the battery is the cause of failure by utilizing a multimeter set to DC Voltage (V⎓) to test the output terminals of the battery pack or charging port, ensuring the system is delivering the required voltage. Alternatively, verify the battery's state by connecting it to a known-functional wall adapter for at least 2-3 hours and observing for charging status indicators, which confirms if the battery is capable of accepting a charge or has entered a deep sleep mode.
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