2 Slot 18650 Battery Holder with Cover and Switch 7.4V Battery Case with 5.5mm x 2.1mm DC Male Plug(Black)

1. Designed to hold two standard 18650 batteries in a series configuration to provide a stable 7.4V power output. This inline double-slot battery holder serves as an efficient mobile power source for various high-voltage electronic projects and devices.
2. Pre-installed with a standard 5.5mm x 2.1mm DC male plug at the end of the durable wire leads. It offers convenient plug-and-play compatibility with Arduino boards, LED strips, development kits, and compatible electronics without additional soldering.
3. Equipped with a protective sliding cover to keep the batteries firmly locked inside, accompanied by a built-in ON/OFF slide switch on the side. This allows you to manage the power output easily without repeatedly unplugging your connected devices, extending battery life.
4. Features high-rebound nickel-plated steel springs that offer reliable electrical conductivity and corrosion resistance. The heavy-duty plastic shell is robust and heat-resistant, ensuring long-term reliability and a snug fit for your 18650 batteries.
5. An essential and practical portable power supply for students, educators, and hobbyists. It serves as a reliable mobile power pack for DIY robotics projects, science experiments, backup power supplies, holiday lighting, and portable test instruments.