A battery holder is a device used to hold multiple AA batteries together and connect them in series to provide higher voltage. With this product, you can connect four AA batteries to a circuit easily. The AA 4-cell flat battery holder is made from high-quality polyethylene and comes in black. It is designed to securely hold the batteries and ensure reliable connections. This AA 4-cell battery holder with cover and protective features is commonly used in various gadgets and electronic devices. Depending on the required voltage, the number of batteries may vary. The VS4 battery holder is another model designed for efficient battery management, offering convenience and durability in electronic projects.