Nikon - MH-21 Quick Charger for Nikon EN-EL4 and EN-EL4a Battery | Woodland Hills Camera
Midwest Photo Promaster Nikon EN-EL 18D Battery
Vinland's EN-EL4 Battery Page
Amazon.com: Kastar 3-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 : 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
NIKON EN-EL4, EN-EL4a, EN-EL4e CS-ENEL4
EN-EL4 EN-EL4a Battery Pack with AC LCD Dual Charger for Nikon D3S D3 D2Z D2H D2Hs D2X D2Xs D3X F6 - AliExpress
Kastar 1-Pack EN-EL4a Battery and AC LCD Dual Fast Charger Compatible with Nikon EN-EL4, EN-EL4a, EN-EL4e Battery, Nikon MH-21, MH-22 Charger, Nikon Grip MB-D10 D300 D300S D700 MB-40 (W/ BL-3 Chamber) -