JJC USB Dual Battery Travel Charger for Nikon EN-EL15 EN-EL15a EN-EL15b Battery on Camera Z7 Z6 D850 D810A D810 D800 D800E D750 D610 D600 D7500 D7200 D7100 D7000 , Replaces Nikon Charger MH-25 MH-25a Check this item on Youtube: https://youtu.be/FbAIlhGUo-A Allows charging 2 batteries at the same time, prolongs your photography time With a built-in USB cable for easy carrying, you can charge the batteries wherever and whenever Double LED indicators display the charging status of each battery Automatically detects when the batteries are fully charged or about to overheat, the charger stops charging to prevent damage to your batteries