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The Dolgin Engineering TC400 Four Position Battery Charger with TDM simultaneously charges four Nikon EN-EL20 battery packs. It will charge batteries in approximately 2.5 hours when all four channels are filled. Additionally, each battery bay is independent, meaning that batteries can be added and removed at any time.
The TC400 features a Test Discharge Module, which puts each battery through a cycle of charging, discharging, and recharging to determine its true capacity. An LCD monitor displays the status, voltage, capacity, and charge percentage of each battery. This charger runs on 100-240 VAC power, enabling use all over the world.