The Nikon EN-EL15 is not included with purchase.
The Nikon MS-D12 AA Battery Holder for MB-D12 is included and is also available separately.
In case you need it:
The Nikon MB-D12 Battery Grip provides extended battery power to the Nikon D800, D800E, D810, and D810a cameras. Key features include:
Extends battery power
Doubles as a vertical grip
Optional AA-battery backup
For the Nikon D800, D800E, D810, and D810a
| Battery Capacity | 1900 mAh |
| Battery System | EN-EL |
| Brand | Nikon |
| Item Type | Power |
| Mfr. Model Number | 27040 |
| Power Type | Battery and Battery Grip |