The battery holder can be connected with ordinary dry battery, alkaline battery and rechargeable battery from C, D, AA, AAA, 18650 to 9v battery. The batteries are connected in series or in parallel, and the output voltage is different according to different battery types. The electricity of battery holder can be output by interface, cable and pin. Battery holder can be widely used in intelligent door lock, remote control, calculator, toy, flashlight, medical equipment and other industrial purposes.

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