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The 3.7V to 5V Boost Module DIY Power Bank Mainboard Circuit Board is a versatile and compact solution for creating your own portable power bank. This circuit board is specifically designed to efficiently boost the voltage from a single 18650 lithium battery, providing a stable output ranging from 3.7V to 5V. Whether you're a DIY enthusiast or in need of a custom power source for your electronic projects, this mainboard offers a reliable and flexible power solution.