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The batteries have actually been triggered at the factory, and also the lithium batteries have no memory, so they can be utilized as required. When the screen battery is complete, you can shut off the power (you can charge one more 1-2 hours after the initial three times). Bluetooth headset battery billing time as well as overcharging is not a concept. Overcharge indicates that the voltage is greater than the charge cut-off voltage during charging, and also the basic lithium battery is 4.2 V.