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This 6-slot AA battery holder box is specially designed for storing and installing 6pcs AA batteries. It comes with a built-in DC2.1 power jack, enabling easy power output connection for various electronic devices and DIY circuit projects. Made of high-strength plastic material, the case is sturdy, wear-resistant and durable, offering good protection against bump and short circuit. The internal fixed slot keeps batteries in place without loose contact, maintaining stable power supply performance. Ideal for small electronic equipment, experimental circuit models, smart device power supply and daily battery storage use.