The Hedbox RP-DEL21 Battery Charger Plate allows you to charge the Nikon EN-EL21 battery with the Hedbox RP-DC50/40/30 charger.
Hedbox Battery Charger Plate for Nikon EN-EL15 for RP-DC50/40/30
Hedbox Battery Charger Plate for Canon LP-E8 for RP-DC50/40/30
Hedbox Battery Charger Plate for Sony NP-FZ100 for RP-DC50/40/30
Hedbox Battery Charger Plate for Panasonic DMW-BLK22 for RP-DC50/DC40/DC30
Hedbox Battery Charger Plate for Canon NB-10L for RP-DC50/40/30
Hedbox Battery Charger Plate for Canon BP-970/975 for RP-DC50/40/DC30
