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1S lithium battery voltmeter module compatible with 1S Li ion and LiPo cells in DIY power packs, RC models, and portable electronics, showing cell status across 3.7 to 4.2V for quick visual checks. Battery indicator 3.7 to 4.2V offers a clear digital readout to verify charge state, plan charging, and reduce deep discharge on single cell projects with a simple two wire connection for setup. Mini voltage display board fits tight spaces in enclosures, model frames, and mobile devices, supporting bench testing, classroom demonstrations. DIY power pack accessory helps monitor remaining power on drones, cars, boats, and portable tools during outdoor activities or daily tasks, allowing quick decisions without carrying separate meters. Easy integration and use with labeled polarity pads for correct wiring, low power design for ongoing checks, and reliable readings to track cell condition during storage, transport, and routine use.