Note on batteries 18650 batteries are NOT included and must be purchased separately. Compatible only with 18650 cells that have a flat positive terminal. Pay close attention to polarity markings when inserting cells (observe the indicated positive and negative directions). After installing cells, fully charge them to activate before using the case to supply power. Key benefits Expands usable capacity by housing up to 16 x 18650 cells, giving significantly longer runtime compared with singlecell solutions. Builtin digital display shows remaining power and charge status at a glance, so you know when to recharge. Integrated camping light illuminates your surroundings without needing a separate flashlight. Stable output and robust construction designed for repeated use, making the case suitable for DIY projects, home backup, and professional applications. Function and compatibility Function: battery storage and charging/management case for multiple 18650 cells; provides monitored power output and onboard illumination. Compatibility: only 18650 flat lithiumion cells. Do not use button or other sizes/types. Capacity scalability: supports up to sixteen 18650 batteries for increased total capacity and extended operation time. Performance and build Digital readout provides clear, realtime power status to prevent unexpected power loss. Builtin camping light offers convenient, lowpower illumination for work or emergency situations. Constructed for durability and steady power delivery to support repeated charge/discharge cycles. Recommended applications 1. Emergency home backup: Use with multiple 18650 cells to power routers, LED lights, phone chargers, and other small devices during outages. 2. Outdoor and camping: Combine with capacity 18650 cells for a portable power source and onboard light when camping, fishing, or working outdoors. 3. DIY and professional use: Ideal for hobbyists building custom powerbanks, technicians testing battery setups, or professionals needing a modular, capacity battery solution. Usage tips Only use flat 18650 cells and ensure correct polarity per the case markings. Fully charge newly installed batteries before drawing power for performance and to activate cell protection circuitry. individual cells with matched capacity and condition to maintain balanced performance. This charging case provides a flexible, monitored way to combine multiple 18650 cells into a single, durable power source with an integrated display and light—suitable for DIY builders, home users, and professionals who need extended, reliable portable power.