MB-D10 Multi-Power Battery Pack for D300 Includes:

MS-D10EN for use with EN-EL3e battery (sold separately)

and MS-D10 for use with 8 AA batteries (not included; accepts 1.5 V LR-6 (Alkaline), Lithium (FR6), Ni-MH (HR6) or Ni-Mn (ZR6))

Can use EN-EL4/EN-EL4A (sold separately) with optional BL-3 Battery Chamber Cover

EN-EL4/EN-EL4a batteries require BL-3 Battery Chamber Cover sold separately.

EN-EL4a/EN-EL4 and AA batteries support higher frame advance rates (8 Frames per second in the D300) than the EN-EL3e.