Multi-function Battery Charger CaseFour-in-one charger is EN-EL3e battery charger, (1)could be used as a camera storage case to store 2 batteries, (2)and is 2 SD card storage cases. (3)have a phone power bank function. (4)Can be used as a card reader to read camera memory card information. Multiple ProtectionBattery EN-EL3EA for Nikon D300 LCD charger case huge your batteries and SD cards while in storage or traveling, keeps dust, debris out of your For Nikon MH-18 replacement battery, premium quality charger set with Overcharge, short circuit, high temperature, over voltage protection built in. Discharge protection function, when the device is not charged (no output), 10S will automatically turn off Switch button for Nikon D200 chargerThe switch button has 2 functions, (you need to press the switch once for the output function; when it is used as a storage box, you need to press the button to turn off the power