Check the listing for details. 2pcs iSmartHome 3D Printed AA to Size D Ring Style Battery Adapters, Intro Spec. Condition: New. Listed at 2.79 USD. This is the Introductory Special. Original price $4.98 AA size battery is popular and widely used. AA 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 AA to size D battery adapter could be used for these situations. The cool AA 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 braze screw are included. This listing is for 2 pieces of the battery adapters. You could change 2 size AA 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 AA to size D battery adapter.