Nikon EN-EL4a 2500mAh Lithium-Ion Battery Pack for Nikon's D300 and D3 Pro DSLR. Charges in approximately 120 minutes.
For use with MB-D10 Multi-Power Battery Pack (and all D2-Series and D3
D-SLRs). EN-EL4a, combined with MB-D10 Multi-Power Battery Pack, enables
8 fps operation of D700 and D300; requires MH-21 or MH-22 Quick Charger
and BL-3 Battery Chamber Cover