Nitecore's D4 comes equipped with a digital LCD screen, separated into sections that detail what mode the charger is in, how much battery life is in each charging slot, the amount of voltage in each battery, as well as something quite brilliant. The D4's charging slots have adjustable negative sides, meaning you can fit a battery as small as a RCR123A to as big as a C, and everything in between. They also charge independently of each other, meaning a battery can be empty and slotted in while another is almost finished charging, and the nearly full one won't interfere with the empty. Or either of the other two slots, even if they're in different modes (LiFePO4 batteries need a separate mode, accessed by holding the side button for a second).
There are few quite like this digicharger, if any. Nitecore has come up with something quite unique, and if there are any that are better than the D4 digicharger, it must make coffee.
Most of the D4 is made from sturdy ABS plastic, able to withstand to any accidental drops from where you had it sitting. Or accidental seat usage, if placed on a chair or counter.
Similarly, the LCD screen is hardy enough to survive those, and you’re more likely to poke yourself on the metal sliders than break them. The slot/mode button on the side is sturdy and takes a lightly firm click to change between the four spaces for charging, and a deep press for a full second to access LiFePO4 mode.
A Nitecore-issued 18650 2300mAh battery can be fully charged in about four (4) hours. Considering how versatile the various flashlights they can be used in are, though, it is a tradeoff easily made.
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