Charge, test, and store up to 32 AA NiMH batteries at once with this Ostation X AA Automatic Battery Charger from Olight. Simply drop your rechargeable batteries into the top of the Ostation—it doesn't even matter which way the buttons are pointing—and the device will charge them four at a time and dispense charged batteries at the base. The see-through plastic housing lets you see the "waterfall" process as the batteries are tested, sorted, and charged. Wrong-size, non-rechargeable, zero-voltage, or high internal resistance cells are automatically sent to a reject tray.
The batteries are protected by circuitry and venting against overheating, over-current, over-voltage, over-charging, short circuit, and electrostatic breakdown. You can control and operate the Ostation remotely from your smartphone with the Olight app. Choose between fast charging mode at 2.5 hours for up to four cells or standard mode at up to 3.8 hours per group of four. The Ostation can also share power with other devices through its USB-C input/output ports.