Nikon EN-EL4a Rechargeable Li-ion Battery for D2xs, D3
Amazon.com: Wasabi Power Battery for Nikon EN-EL4, EN-EL4a and Nikon D2, D2H, D2Hs, D2X, D2Xs, D3, D3S, D3X, F6 : Electronics
Amazon.com: Kastar 1-Pack EN-EL4a Battery 11.1V 3200mAh and AC LCD Dual Fast Charger Compatible with Nikon Camera D2, Nikon Camera D2H, Nikon Camera D2Hs, Nikon Camera D2X, Nikon Camera D2Xs Camera :
2Pcs 11.1V 3300mAh EN-EL4 EN EL4 EN-EL4a ENEL4a Camera Battery Bateria Akku for Nikon D2H D2Hs D2X D2Xs D3 D3S F6 MH-21 Cameras - AliExpress