Converts AA batteries to a D size to power devices that require D cells, helping you save on replacement costs. Flexible configuration with 1, 2, or 3 AA cells using the adapter holder (batteries not included) to tailor power and runtime. Hassle-free charging: no need for a dedicated D battery charger; use your existing charger to recharge AA cells and run the device via the adapter. Performance and compatibility: using 3 AA cells provides higher capacity and longer runtime than a single AA, making it suitable for high drain applications. Applications: ideal for devices that typically use D batteries, such as flashlights, toys, and other high-drain equipment. Use scenarios: - In a flashlight that normally requires D batteries, using 3 AA cells for extended run time. - In a portable lantern or camping light that uses D cells. - In remote-controlled toys or gadgets designed for D batteries, powered by AA cells.