When compared to traditional lead acid batteries...


lighter weight


more efficient


longer lifespan


higher charging efficiency


K2 Energy Compatibility

14500, 16340, 18650, and 26650

Constant Current

Max: 500mA +/- 50mA | Min: 150mA +/- 50mA

Testing and Compliance

CE | UL | FCC | RoHS | ASA | TUV | PSE

Compatibility with other Li-ion, IMR, INR, ICR 3.6V-3.7V Batteries

10440, 14650, 17335, 17500, 17670, 18350, 18490, 18500, 18700, 22650, 25500


LxWxH - 5.16 in. (131mm) x 2.6 in (66mm) x 1.3 in (33mm)

Operating Temperature

32°F to 104°F (0°C to 40°C)

DC Input Voltage

DC 5.0V 1000mA

Safety In Mind

Short Circuit Protection, Over Current Protection, Reverse Polarity and Auto Recovery

Added Benefits

Compact, lightweight, independent charging circuits, real-time LCD Display

Frequently Asked Questions


    Unbelievably light weight. Will be perfect for running my QRP rig from the field. Amazing technology. Would recommend to anyone.

    John T.

    Love this battery. Maintenance free and SAFE! I use mine for storing solar energy for DC powered projects and applications.


    A lightweight and long-lasting battery

    Jeff Tang

    12 days ago

    These K2 batteries are perfect. They work exactly as advertised and the run time is a little longer than I had expected.

    David O.

    Cutting edge technology and impeccable customer service. Highly recommended!

    Derk Hebdon

    Verified customer

    What Makes Us Different

    Free Shipping

    on all order over $150

    Pioneering LFP Innovation

    for over 16 years

    Designed & Developed in the USA

    and proud of it