When compared to traditional lead acid batteries...


lighter weight


more efficient


longer lifespan


higher charging efficiency


Energy Density

Industry's highest LFP energy density with unmatched efficiency and performance

Testing and Compliance

UNDOT 38.3 Tested | RoHS Compliant | IEC 62133 Certified | UL 1642

Operating Temperature

-4°F to 149°F (-20°C to 65°C) - Far exceeding the safe operating range of traditional lead acid batteries

Storage Capacity

3.75 Ah (amp hours). K2 Energy's energy cells deliver a steady power output over the entire span of 3.75 amp hours


Length: 65.2mm (2.57 in.) Diameter: 26.3mm (1.04 in.)


≤3.75 amp recommended continuous discharge and 20 amp max continues load current.



Safety In Mind

Proven chemically safe formula


~88g (3.10 oz) - More than 50% lighter than comparable lead acid cells

Added Benefits

Environmentally friendly chemistry and unmatched safety

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