12V 40AH Lithium Ion Battery | Deep Cycle Battery | Starting Battery

A Drop In Replacement & Upgrade from AGM, Gel or Lead Acid Batteries.

This 12V 40AH Lithium Ion Battery features an automatic built in battery protection system (BPS) that keeps the battery running at peak performance and protects the cells for thousands of cycles. This battery is plug and play for almost any application that currently uses a lead acid, gel or agm battery.

12V 40AH Lithium Battery Model 12V40AH
Group Size 12V40A
Nominal Voltage 12.8V
Charge Voltage 14.4V to 14.6V
Max Charge / Discharge Current 40A (amps)
Cold Cranking Amps 400A (amps)
Length 7.75"
Width 6.45"
Height 6.75"
Weight 13 lbs
Type LiFePO4
  Usable Capacity (amp hours) 40AH
Depth of Discharge 100%
 images.jpg  Peak amps 5 seconds 400A
Reserve Minutes @ 20A 120
Reserve Minutes @ 40A 60
Self Discharge <3% a year
Capacity % @ 100 Cycles 102%
Capacity % @ 500 Cycles 96.3%
Capacity % @ 1000 Cycles 90.8%
Capacity % @ 1500 Cycles 85.4%
  Capacity % @ 2000 Cycles 80.1%
Temperature Performance
Automatic Battery Protection System
Fahrenheit Usable Capacity Low Voltage Disconnect 8V
140 103% Over Voltage Disconnect 15.8V
122 102% Short Circuit Protection Instant
104 100% Reverse Polarity Protection Instant
86 100% Cell Balancing  Automatic
68 98%    
50 92% Cell Specifications
32 83% Connection Bolted
14 80% Type Cylindrical
-4 70% Internal Impedance ≤10mΩ
-22 60%    
-40 10% Warranty
-58 0% Repair or Replace First 5 years 
    Repair or Pro Rate Life Time
    Detailed Warranty Information Warranty

This 12V 40AH Lithium Ion Battery is the perfect replacement from a  AGM, GEL or Lead Acid Battery. The SB40 is designed as a "drop in replacement" meaning all you have to do is take out your old battery and place the Lithium Battery in the same way.

Our Lithium Ion Batteries are Green, Non Hazardous and have about 30% more energy density in the same size case as a lead battery. Because your lead batteries can only be drained to 80% and are only recommended to drain down to 50% - In some cases the Smart Battery can produce over 50% more usable energy than the same size lead battery.

As you may know, Your existing lead based batteries are inefficient, obsolete and a problem waiting to happen. Typical Lead Acid Batteries have many problems including: they loose up to 30% of their energy per month from self discharging. They have a severe voltage drop when a load is placed on them, they can off-gas, leak acid and hazardous chemicals, do not last long, they are very heavy and made of a toxic material. 

Our Lithium Ion Batteries are 99.9% efficient, Provide over 100% usable energy of the rated capacity, and have less than 1% per month self discharge. 

Whether you are installing a new Solar System, replacing your Marine Boat Batteries or outfitting a commercial application, Our Lithium ion Batteries give you the chance to do energy storage right from day one. Most Important for you are the facts that Smart Batteries can last over 5000 cycles meaning you buy a Lithium battery once and you are done. And considering their longevity and the efficiently they are less costly than the heavy and toxic lead acid batteries.

If you want to "go green" the lithium Batteries are not only virtually indestructible but they are non-toxic. Our products are readily available direct through us or by contacting one of our local distributors closest to you. This fantastic technology is making our planet a better and cleaner environment. 


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