【Product Description】
One charger for all your household batteries! The Keeppower K-Series (K1 / K2 / K4) USB-C Universal Battery Charger is the ultimate charging solution for homes and enthusiasts alike. By combining advanced charging technology with universal compatibility, this charger handles both 3.6V/3.7V Li-ion rechargeable batteries (such as 18650, 21700, 26650) and standard 1.2V NiMH batteries (AA, AAA, A, SC, C, F6).
What truly sets the K-Series apart is the manual 3-level current adjustment. With a simple press of the "SET" button, you can switch between 0.5A, 1A, and 2A charging currents, allowing you to prioritize speed or battery health depending on your needs. The clear 5-level LED indicator (25%, 50%, 75%, 100%) lets you know exactly how much power is left at a glance.
Powered by a modern USB Type-C port, you can plug it into a wall adapter, power bank, or laptop. Whether you are maintaining your flashlight batteries, charging your child's remote-control toys, or prepping for a camping trip, the Keeppower K-Series is the smartest, most versatile charger to have on your desk.
IMPORTANT NOTE: This listing is for the charger and USB-C cable only. Rechargeable batteries are NOT included.
【Key Features】
-
Universal Chemistry Compatibility: Designed to intelligently charge both Li-ion (3.6V/3.7V) and NiMH (1.2V) batteries. One charger meets all your daily needs.
-
3-Level Adjustable Charging Current: Use the "SET" button to easily toggle between 0.5A (gentle for small batteries), 1A (standard), and 2A (fast charging for large capacity cells).
-
Clear 5-Level LED Power Display: Built-in intuitive LED lights show the real-time charge status at 25%, 50%, 75%, and 100%, so you always know exactly when your batteries are ready.
-
Convenient USB Type-C Input: Universal charging via any USB-C cable and power source. Includes a free high-quality USB-C charging cable in the box.
-
Wide Physical Compatibility: The extended sliding slots can accommodate massive batteries, including long protected 21700 (up to 74.8mm), 26650, and even small 10440 and RCR123A cells.
-
Multi-Layer Safety Protection: Built-in IC chip provides full protection against overcurrent, short circuits, and reverse polarity, ensuring safe charging for every battery.
【Parameters & Specifications】
-
Brand: Keeppower
-
Available Models: K1 (1-Slot), K2 (2-Slots), K4 (4-Slots)
-
Input: DC 5V / 2A (USB Type-C)
-
Adjustable Charging Currents: 0.5A / 1A / 2A (Max per slot)
-
Power Indicator: 5-Level LED (25%, 50%, 75%, 100%)
-
Compatible Li-ion Batteries: 26700, 26650, 26500, 21700, 20700, 18650, 18500, 18350, 17650, 16650, 16340, 14500, 14430, 10440, RCR123A, and more.
-
Compatible NiMH Batteries: AA, AAA, A, SC, C, F6, and more.
-
Package Content: Charger Unit, USB-C Cable, User Manual
-
Note: Batteries are NOT included.
【Applications】
-
Home & Everyday Use: Charging AA/AAA NiMH batteries for TV remotes, wireless mice, and smart toys.
-
Outdoor & Tactical Gear: Refueling 18650, 21700, or 26650 cells for high-power flashlights, headlamps, and camping lanterns.
-
Vape Enthusiasts: Safely charging Li-ion batteries for high-drain vape mods.
-
Emergency Preparedness: Keeping a stock of fully charged backup batteries for weather radios and emergency flashlights.
【Frequently Asked Questions (FAQ)】
Q1: Does this charger come with batteries?
A1: NO. The Keeppower K-Series chargers are sold strictly as charger units. The package includes the charger, a USB-C cable, and a user manual. Batteries must be purchased separately.
Q2: Can I charge different types of batteries at the same time?
A2: Yes (for K2 and K4 models). The K-Series features independent charging slots. You can charge a Li-ion 18650 in one slot and a NiMH AA battery in another slot at the same time without any issues.
Q3: How do I choose the right charging current?
A3: Use the "SET" button to toggle the current. 0.5A is recommended for small capacity batteries like AA/AAA NiMH or 10440 Li-ion. 1A is ideal for standard 18650/21700 batteries. 2A is for high-capacity batteries (like 26650) when you need the fastest charging speed.
Q4: What do the LED lights mean?
A4: The charger uses a 5-level LED display. The LEDs will light up sequentially to show the charge level: 25% → 50% → 75% → 100%. Once the 100% light is on steadily, the battery is fully charged.
Q5: Is it safe to charge my batteries overnight?
A5: Yes. The charger features an intelligent IC chip with multiple protection layers. It automatically stops charging once the battery reaches its full voltage, preventing overcharging and ensuring safety for overnight use.
