Amazon.com: Synergy Digital Camera Battery, Compatible with Nikon D2X Digital Camera, (li-ion, 11.1V, 1800 mAh) Ultra High Capacity, Replacement for Nikon EN-EL4 Battery : Electronics
Batteries N Accessories BNA-WB-ENEL4 Digital Camera Battery - li-ion, 11.1V, 1800 mAh, Ultra High Capacity Battery - Replacement for Nikon EN-EL4 Battery - Walmart.com
Kastar 4-Pack EN-EL4a Battery 11.1V 3200mAh Replacement for Nikon EN-EL4, EN-EL4a, EN-EL4e Battery, MH-21, MH-22 Charger, Nikon Camera D2, Nikon Camera D2H, Nikon Camera D2Hs, Nikon Camera D2X - Walmart.com
Replacement Camera Battery EN-EL4 EN-EL4a ENEL4 for Nikon D2 Digital SLR D3 Digital SLR D2H D2X D2Hs Set D3s - AliExpress