Large capacity and multiple types: The box measures 36cm x 17.5cm x 4.5cm and can hold up to 116 batteries of different sizes: 54 AA, 28 AAA, 8 D batteries, 10 C batteries, 4 9V batteries, 12 button batteries, and it includes a battery tester. Sturdy and transparent plastic material: Made of durable plastic that is flexible and resistant to bending, allowing you to see and locate the needed battery quickly and avoid unnecessary searching. Independent compartments: Compartments are divided into different categories to store batteries separately, preventing damage and short circuits, which helps extend battery life and keep items safe. Includes battery tester: Comes with a universal battery tester and an accessible testing slot to quickly check the power of your batteries. Use scenarios: Home electronics organization: neatly store batteries for remotes, keyboards, game controllers, and other household devices for easy access. Workshop or garage storage: organize tool and rechargeable batteries for quick use during projects. Classroom or maker space: keep diverse battery sizes organized for student projects and experiments.