Check the listing for details. 2pcs iSmartHome 3D Printed AAA to Size D Battery Adapters, Introductory Special. Condition: New. Listed at 2.95 USD. This is the Introductory Special. Original price $4.98 AAA size battery is popular and widely used. AAA size rechargeable battery is much cheaper then D size rechargeable battery. Sometimes we may need D size battery but it is not worth to go out and buy a new D size battery. This AAA to size D battery adapter could be used for these situations. Size D battery is designed for high current devices. If you use the AAA battery for high current devices, the battery will be depleted quickly or even damage the AAA battery. So please check the discharge current of your device before you choose the adapter for AAA battery. We recommend AA battery instead of AAA battery for devices using size D battery. The cool AAA to Size D Battery Adapters are built with the 3D printing technology.Material: ABS plastic Battery is not included. The battery showing in the photo is used as an example to compare the size of the adapter. Plastic adapter and screws are included. This listing is for 2 pieces of the battery adapters. You could change 2 size AAA batteries into 2 size D batteries. If you need more battery adapters then the available quantity here, please contact me to start new building process on demand. Build on demand is one of the benefits of using 3D printing. The build time is more then 50 minutes for each AAA to size D battery adapter.