Nikon D3S long (very long)-term shooting experience: Digital Photography Review
Amazon.co.jp: NinoLite EN-EL4a / EN-EL4 Compatible Battery for Nikon Camera D3X D3S D3 D2H D2HS D2X D2XS D700 D300S D300 F6 etc. : Electronics
Amazon.com : Synergy Digital Camera Battery, Compatible with Nikon D3 Digital Camera, (li-ion, 11.1V, 1800 mAh) Ultra High Capacity, Replacement for Nikon EN-EL4 Battery : Electronics