Btone AA turn to D size battary adapter converter, new genuine bulk package
The converter without batteries, battery be sold separately
Just a few seconds, an AA batteries will turn into the D battery.

Caution: When you use two or more adapters together, do not mix new and used batteries, batteries at different charge levels or different types and brands. Use only Btone Ni-MH batteries. Do not use adapters with actual D bateries. Please insert the AA battery into adapter correctly. Be sure to insert battery into adapter only when using in electronic device. Remove bttery after using, or when not in use. Store adapter separately from battery. Do not recharge battery while in the adpter.