The Keeppower K1 Li-ion Rechargeable Battery Charger is a reliable and highly versatile charging solution specifically designed for users who need efficient charging performance for a wide range of battery types. Featuring a one-slot design, this charger is ideal for everyday use at home, in the office, or during travel, offering simplicity combined with sophisticated functionality to maintain battery performance and extend battery life. It operates with an input of DC 5.0V at 2.0A, allowing it to be powered easily through a standard USB power adapter, a laptop, or even a portable power bank, providing maximum flexibility for users who need a portable charging option.

The K1 charger delivers intelligent output management based on the battery type. For Li-ion rechargeable batteries, it offers three charging currents—0.5A, 1A, and 2A—at an output voltage of 4.20V, ensuring that each battery receives the appropriate current level to promote efficient and safe charging. For Ni-MH rechargeable batteries, it provides a stable output of 1.48V at 0.5A, making it equally effective for managing smaller batteries commonly used in household electronics. The charger’s ability to support different chemistries, combined with variable charging currents, ensures that batteries are not stressed during charging, thereby preserving their long-term capacity and performance.

Compatibility is one of the standout features of the Keeppower K1. For Li-ion batteries, it is suitable for a broad array of sizes including 26700, 26650, 26500, 21700, 18650, 18500, 18350, 17650, 17500, 16650, 16340, 14650, 14500, and 14430. In addition, it supports Ni-MH rechargeable batteries such as AA, AAA, A, SC, C, and F6 sizes. This wide compatibility makes the K1 a highly practical tool for users who rely on multiple battery types for flashlights, cameras, toys, medical devices, and other portable electronics.

Monitoring the charging process with the Keeppower K1 is straightforward thanks to the clear LED indicator system. The charger is equipped with four LED lights that show the real-time charging status. When one LED is lit, it indicates a charge level between 6% and 25%. Two LEDs indicate 26% to 50%, three LEDs show 51% to 75%, and four LEDs signify that the battery has charged to between 76% and 100%. This system provides users with a quick and easy way to monitor the progress of their charging batteries at a glance, ensuring that batteries can be removed promptly once charging is complete.

The K1 charger is designed with user safety and battery protection as top priorities. It features robust internal circuits that protect against overcharging, ensuring that batteries are automatically disconnected from charging current once they reach full capacity. This not only prevents overheating and potential battery damage but also extends the usable life of both the batteries and the charger. The charger also safeguards against reverse polarity installation, automatically preventing charging if a battery is incorrectly placed, thereby avoiding potential hazards.

A key advantage of the K1 is its simplicity of use combined with high-grade functionality. Users can easily select the appropriate charging current to match the battery size and chemistry by following simple instructions. Smaller batteries such as AAA and 16340 benefit from the lower 0.5A setting to prevent overheating, whereas larger, high-capacity batteries like 18650 and 26650 can be charged at higher rates such as 1A or even 2A for faster charging times. The ability to adjust the charging current ensures that users can tailor the charging process according to the specific needs of each battery, maximizing safety and efficiency.

The charger’s design is compact and travel-friendly, making it ideal for users who frequently move between locations or who require a charger that can easily be stashed in a gear bag, toolkit, or backpack. Its USB-powered input further enhances its convenience, as it allows users to charge batteries anywhere there is access to a USB port, whether it be in a car, a hotel room, an airport lounge, or a remote campsite with a power bank.

The Keeppower K1 Li-ion Rechargeable Battery Charger combines professional-grade charging performance with a user-friendly interface and high portability. Whether you are charging large, high-drain Li-ion batteries for a tactical flashlight or topping up AA Ni-MH batteries for everyday household devices, the K1 provides a reliable, safe, and efficient solution. Its wide compatibility, adjustable charging currents, clear charge indicators, and safety protections make it a must-have tool for anyone who depends on rechargeable batteries to power their devices.

1. Type: 1-slot Li-ion Battery Charger;
   2. Part No.: K1;
   3. Input: DC 5.0V 2.0A;
   4. Output:
   4.20V—0.5A/1A/2A (For Li-ion Rechargeable battery)
   1.48V—0.5A (For Ni-MH Rechargeable battery)
   5. Compatible with:
   Li-ion Rechargeable Batteries: 26700/26650/26500/21700/18650/18500/18350/17650/17500/16650/16340/14650/14500/14430
   Ni-MH Rechargeable Batteries:
   AA/AAA/A/SC/C/F6
   6. Track charging status via the indicator lights.
   One LED— 6%-25%
   Two LED— 26%-50%
   Three LED— 51%-75%
   Four LED— 76%-100%
   7. Charged by USB power adaptor, laptop, power bank, etc

SHIPPING
The final shipping cost and estimated delivery timeframe will be available to you during checkout. Currently, we offer 3 International shipping methods which are steady and easy to track. Priority worldwide shipping, Premium ( Partial countries) and a faster Express shipping. The estimated times stated below are not guaranteed. An international package could experience delays like postal strikes or severe weather or Cov-19 situation. All shipping ways, PO Box address is not acceptable.

If you don’t receive your order within the estimated time frame provided below and suspect that it might be lost in transit, please contact Flashlightgo Support ( support@flashlightgo.com ) and we can look into the order with the courier. Lost-in-transit requests must be submitted to Flashlightgo Support within 3 months of the date of shipping or before the courier archives the tracking information.

Option 1.
Express by DHL/UPS/Fedex/Aramax/SF etc ( there may be tax need to pay in this way),
The estimated time of delivery is usually 3-7 work days depending on the country. Includes detailed tracking and confirmation of delivery.

Option 2.
Premium ( 6-10days, All tax and Duty Paid),
All tax and duty are prepaid to carrier by Flashlightgo before shipping, so you dont need to pay any tax or duty when you get it.

Option 3.
Priority shipping(1-2 Weeks, average 10 days)
If we marked it is with all tax and duty paid, all tax and duty are prepaid to carrier by Flashlightgo before shipping, so you dont need to pay any tax or duty when you get it.

Learn more,Please click on here.

To ensure that you get the desirable product, we allow a seven-day product return period. Any product return application outside this period will not be entertained.
All returned product must be unused and the original package should be kept.

Return：
We do not offer return for personal products like socks and hats or food, magazine and fragile or dangerous products The original receipt must be available for application of return.

Discount products：
No product return for discount products

Gifts products：
If the item is marked as a gift when purchased and shipped directly to you, it cannot be exchanged , refunded or warranty.

Exchange：
We only replace items if they are defective or damaged.
Exchange service are offered only to wrong deliveries or product damage not caused by client. If needed, please email to info@flashlightgo.com.

Warranty
How long is the warranty period?
Flashlightgo warrants to the original purchaser that the Product(s) shall be free of any defect in material or workmanship for a period of one year for labor and one year for parts from the date of the original order except the items listed below:
Chargers,Batteries and Other Accessories: 3 months warranty

Should the Product(s) supplied by Flashlightgo prove defective because of improper workmanship or material as reasonably determined by us, Flashlightgo agrees, at its option, to either repair or replace the Product free of charge, excluding any shipping or handling charges.

Learn more,Please click here.