[Premium Quality Lithium Iron Phosphate Batteries Online]-Abyss Battery
[Premium Quality Lithium Iron Phosphate Batteries Online]-Abyss Battery
[Premium Quality Lithium Iron Phosphate Batteries Online]-Abyss Battery
[Premium Quality Lithium Iron Phosphate Batteries Online]-Abyss Battery
[Premium Quality Lithium Iron Phosphate Batteries Online]-Abyss Battery
[Premium Quality Lithium Iron Phosphate Batteries Online]-Abyss Battery
[Premium Quality Lithium Iron Phosphate Batteries Online]-Abyss Battery
[Premium Quality Lithium Iron Phosphate Batteries Online]-Abyss Battery
[Premium Quality Lithium Iron Phosphate Batteries Online]-Abyss Battery

ABYSS® 12V 300Ah Off-Grid™ Lithium Marine House Battery


Regular price$2,999.99
Shipping calculated at checkout.

Battery Size
  • In stock, ready to ship
  • Inventory on the way
  • Safe - RoHS Compliant
  • 5-Year Free Replacement Warranty
  • 30 day risk free - money back guarantee
  • UN/DOT 38.3 Hazmat approved and ready to ship around the clock for fast delivery to your home or business.

The ABYSS® 12V 300AH Off-Grid™ Marine Lithium Battery is a high capacity Dual-purpose performance Lithium-ion battery with a Group 8D footprint. This battery is ideal for off-grid living, energy storage applications, and starting large outboard or diesel motors. 

The module's inherent safety, extended cell life, and zero maintenance offers end users a more reliable battery alternative by performing with more than twice the run-time and <70% of the weight of similarly sized AGM batteries. Our integrated Battery Management System is designed to operate seamlessly with any application and manages all of the modules system parameters in real-time.

Learn more: Powering Aquila: Lithium Iron Phosphate Batteries and Solar Array

Design Features:

  • Higher qualified cylindrical cells 🔋

UL1642, IEC62619, IEC62133 listed with Cycle life more than 3000 times and excellent consistency.

    • Bluetooth® Connectivity 📲

    Can monitor the battery status(charge, discharge, current, temperature, cycle life and so on) and change the data for different applications.

      • Built-in heating ♨️
      Uniform internal heating is an important feature of our cold-weather performance batteries, as many external heating blanket options currently available cannot sense the internal temperature of the cells and may not be completely effective at heating the battery throughout. The system features proprietary technology that draws power from the charger itself, requiring no additional components. The entire process of heating and charging is completely seamless. Simply plug the battery into the regular lithium charger and the internal heating and monitoring system takes care of the rest.
      • More stable and firm internal structure ⚙️
      The cell holders within our battery protect and separate each cell to avoid any short circuit risks caused by intense vibration or impact. The separation and space created between each cell also improves the overall heat dissipation within the battery pack while charging and discharging.




            Group 24 12V 120Ah Lithium Marine Battery Product Specifications

            General Specifications

            Physical Dimensions  10.2" x 6.69" x8.18" (260 x 170 x 208 mm)
            BCI Group Size Group 24
            Weight  25.4 lbs (11.3 kg)
            Water Rating IP65
            Terminal Type  M8 x 1.25"
            Terminal Torque 80-100 in-lbs (8-10 N-m)
            Case Material Acrylonitrile Butadiene Styrene - Flame Retardant
            Cell Type LiFePO4

            Electrical Specifications

            Nominal Voltage 12.8 V
            Nominal Capacity 120 Ah
            Capacity (watts) 1536W
            Parallel Connection  Max. 6 units
            Series Connection Max. 4 units
            BMS 4S150A
            Circuit Protection

            Over charge, Over discharge, Over current, Over temp, Short circuit, Balance, Automatic Fault Recovery

            Cycle Life

            3000 times Cycles @100%DOD and 6000 times @80% DOD

            Self Discharge

            Less than 3% per Month

            Charge Efficiency

            100% @0.2C

            Discharge Efficiency 

            98-100% @1C

            Charge Specifications

            Charge Voltage

            14.4 ± 0.2V

            Standard Current


            Fast Current


            Maximum Outboard Alternator Size

            150 Amps

            Cut-off Over Voltage


            Discharge Specifications

            Standard Current  24A
            Max. Con. Current 120A
            Peak Current 800A (300ms) ~ 1500 CCA
            Cut-off Voltage


            Temperature Specifications

            Charge Temp 0℃ to 55℃ (32℉ to 131℉)
            Discharge Temp -20℃ to 60℃(-4℉ to 140℉)
            Storage Temp -5℃ to 45℃(23℉ to 113℉)

            Certification & Compliance

             UL1642 (cells) File# MH49498
            IEC62133 (cells) Standard for Exporting Lithium-ion Batteries
            ROHS Electrical and Electronic Equipment
            Shipping UN 3480, CLASS 9 Hazmat



            Click the links below to view and download owner's manuals and instructions for your Abyss Battery® products.







            Thank you for taking interest in the products we offer at Abyss Battery. This Limited Warranty applies to physical goods, and only physical goods purchased from Abyss Battery. We recommend you protect your investment and register your warranty.

            If your battery is not registered within 90 days of purchase, warranty will begin at manufacture date of battery. Proof of ownership is required. Warranties are not transferrable. Unlike other Lithium battery companies, Abyss Battery has additional support through the purchase of our Extended Warranty program. 

            Manufacturer’s Limited Warranty

            Warranty Coverage  5-Year Free Replacement  After 5 years, 35% Off a New Replacement up to 10-Years

            Extended Warranty

            Extended Coverage 7-Year Free Replacement  After 7 years, 50% off a new Replacement For Life 

            Enjoy 7 years of peace of mind when you buy ReCharge+ for your Battery. ReCharge+ for Abyss Battery® Extends your Free 5-Year Replacement Coverage by 2+ additional years from your purchase. In addition to a free battery replacement, you’ll get 24/7 priority access to our Battery experts by chat or phone.

            One stop for support:

            • 24/7 priority access to Battery experts by chat or phone
            • Global repair coverage
            • Onsite repair for Batteries: Request that a technician come to your work site
            • Mail-in repair: Mail in your Battery using a prepaid shipping box provided by Abyss Battery
            • Carry-in repair: Bring your Battery in to our Authorized Service Providers

            How to Buy?

            1. Purchase ReCharge+ for $199.99 with your New Battery.
            2. Or buy it within 60 days of your Battery purchase:
            • Online: Add extended warranty to your shopping cart when you checkout.
            • By calling: 1+ (855)-719-1727

            What does Limited Warranty cover? 

            We guarantee that every battery sold by us or any of our authorized dealers and OEM distributors, to be defect free from the date of purchase. Our Li-ion Batteries are designed to be a drop-in replacement for lead-acid and AGM battery applications. This Limited Warranty covers any defects in materials and workmanship under normal use during the Warranty Period. During the Warranty Period Abyss Battery will repair or replace, at no charge, products or parts of a product that proves defective because of improper workmanship, under normal use and maintenance.

            What will we do to correct the problems? 

            In the unlikely event your battery is defective we will repair or replace the battery. If the battery is repairable, it will be repaired at no cost and returned to you. If it is not repairable and the issue was caused by a manufacturer defect, we will replace the battery at no cost within the first 5 years. After 5 years, we will repair your battery at no cost to you if the battery is repairable. In the unlikely event it is not repairable, we will prorate the cost of a new replacement battery for you at 35% off the cost of a new one. In some cases, your warranty claim may require special order parts and it can take about 2 weeks for us to get the necessary parts and components. If a customer requests a replacement battery right away, the customer will temporarily pay for a replacement and a credit will be issued once the warranted battery is received and found to be defective or in need of repair.

            How long does the Warranty Last? 

            • The Warranty period for physical goods purchased from Abyss Battery is 3,650 days (10 years). 
            • A replacement battery assumes the remaining warranty of the original battery or 10 years from the date of purchase. 

            What does this Limited Warranty not cover? 

            This Limited Warranty does not cover any problem that is caused by: 
                1. Conditions, malfunctions, or damage not resulting from defects in material or workmanship.
                2. Damages from shipping.
                3. Damages caused by abuse/neglect (DO NOT JUMP START!)
                4. Loose terminal bolts.
                5. Corroded hardware.
                6. Failure to improperly install the battery. 
                7. Tampering or removal of manufacturer codes.
                8. Properly charging and maintaining the battery.
                9. Breakage from collision.
                10. Improper storage, which includes damage from water, extreme heat or freezing temperatures.
                11. All bolts must be tightened with a torque wrench and NOT by hand to avoid overheating caused by a loose connection.
                12. Use approved and authorized chargers only. 

            What do you have to do?

            • All products purchased must be registered within 90 days of purchase or have an original purchase receipt in order to be eligible for a warranty. If neither of these things are true Abyss Battery reserves the right to deny any warranty claim.
            • All warranty claim batteries must be returned to and received within the warranty period.
            • All shipping of return items and replacement items are the customer’s responsibility unless deemed a manufactured defect.
            • All RMA shipments must be sent with proper Hazardous Goods Paperwork. Shipping your battery back to Abyss Battery without proper paperwork and RMA identification may lead to the loss of your item or the denial of your warranty claim.

            The customer bears the responsibility to properly package the warrantied item so that it will not be damaged during the shipping process. We recommend keeping the original boxing or request a replacement box and use a approved hazmat certified shipping department. Abyss Battery will not bear responsibility for the customer not following the regulated rules and guidelines in returning a battery for a warranty claim. This includes the classification of certifying your warranty claimed item as Dangerous Goods along with the proper packaging, labeling, and using qualified shipper to return the product back to us for assessment.

            Battery Management System

            All of our lithium batteries include a built in battery management system. Our BMS operating system is designed to sense short circuit, reverse polarity, overcharge, and over discharge voltage protection. The BMS prevents failure and will internally disconnect to prevent damage to the cells if it senses any of the following conditions. If your battery has disconnected. Please contact us through the form below and we will guide you through the steps necessary to resolve the issue.

            Back Orders

             Some products may not be readily available and must be ordered from our factory. Within 48 hours after you place your order we will notify you by phone or email if the item is on back order and provide you with the expected ship date. If the products have not yet shipped you can cancel your order anytime. Production delays do happen and we apologize in advance. Abyss Battery will do everything to help you get your products as soon as possible. 

            Return Policy

            If you have not used or unboxed your product you are eligible for a refund. Abyss Battery must receive the items you wish to return within 30 days of purchase. If we do not receive your battery with in the time frame a refund will not be issued. Once we receive the items with in the 30 day time frame your refund will be processed. The customer is liable for all shipping expenses and a 20% restocking fee. Abyss Battery values our commitment to excellent customer service and it is our top priority. Please contact us if you have further questions about our warranty and return policy.

            Warranty Disclaimer

            Customers should adhere to all documentation and guidelines. Manufacturer will not be responsible for any expenses related to installation/removal, electrical system tests, battery charging, loss of time or other expenses which should be considered incidental damages, including all shipping charges after the first 30 days of warranty. 

            This warranty applies under conditions of normal use. The warranty does not cover: 1) defects caused by improper assembly or disassembly; 2) defects occurring after purchase due to product modification, intentional damage, accident, misuse, abuse, negligence or exposure to corrosive elements; 3) cosmetic damage and 4) labor or assembly costs. Except as provided herein, Abyss Battery, Inc. makes no express warranties, and any implied warranty, including without limitation any implied warranty of merchantability or fitness for a particular purpose, is limited in its duration to the duration of the written limited warranty set forth herein. Except as provided herein, Abyss Battery, Inc. shall have no liability or responsibility to the purchaser or any other person or entity with respect to any liability, loss or damage caused or alleged to be caused directly or indirectly by use of the product, including, but not limited to, any incidental or consequential damages. Some states do not allow limitation on how long an implied warranty lasts or the exclusion of limitation of incidental or consequential damages, so the above limitation and exclusion may not apply to you. This warranty gives you specific legal rights. You may also have other rights which vary from state to state.


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            Customer Reviews

            Based on 1 review
            Run Wild Sailing
            Quality lithium iron phosphate batteries made to sustain life.

            We have been living on our boat Aquila now for over 6 months with two 300AH Abyss batteries as our house bank, combined with four solar panels, two MPPT controllers, and a DC to DC charger. We are very pleased with the performance of the batteries, the lightweight design, and the obvious attention to detail in regards to the internal components and overall internal design of the cells. These batteries power our electric oven, electric induction stovetop, electric water kettle, autopilot, 1HP electric motor for our desalination unit, and everything else on the boat with the help of a 3000-watt inverter charger to take the lithium battery power and convert it to 120v for our house appliances and laptops. There are tons of LifePo manufacturers out there, but there aren't many focusing on quality and longevity. We trust our Abyss batteries and are going to sail them around the world this year. You can find cheaper lithiums featuring plastic internals, lower life expectancy, stamped MADE IN CHINA, but these are not that. These are highly engineered and well-thought-out batteries for people who wish to own the best. Don't take my word for it, do your research before you buy.

            36' Yellowfin with Abyss 12V Lithium Marine Dual Purpose Batteries.


            12-Volt Marine Batteries.

            Abyss Batteries deliver 100% useable capacity, consistent power, and superior voltage stability. Experience a whole new standard of long lasting performance.

            The best connection for boaters and fishermen.
            Stay In Control Of Your Boat's Power

            Our marine LiFePO4 batteries feature a Bluetooth® App that gives real-time access to battery state of charge, voltage, operating current, temperature, and other operating information. Search for Abyss Battery® on the Apple App Store or Google Play.

            More Amp hours, Smaller Size.
            Unmatched Durability & Safety

            Abyss Batteries demonstrate the highest safety performance in the industry while also offering increased current, capacity and durability. Our Batteries are more reliable and safer than comparable products because they cannot short out due to our design construction. Cell holders within the battery provide a more robust stable, and firm internal structure that protect and separate every cell to avoid any circuit short risk caused by vibration or impact.

            Proven Reliability and Performance.
            12 Volt Dual-Purpose Lithium Marine Starting Batteries

            All Abyss Batteries are built tough, with a shock-resistant and vibration-resistant construction. Our marine batteries are also fully waterproof and saltwater tested to fully combat corrosion.

            Lithium Ion Outperforms Lead Acid In Every Way.
            The Only Boat Battery You'll Ever Need

            Abyss vs. Lead-Acid, better for the environment and your wallet. Compared with traditional battery technology, Abyss batteries charge 50% faster, last longer, are lighter, and have 2X the power density for more battery life in the same size and shape as lead acid. 

            Abyss Lithium marine batteries powering offshore fishing boats reliably.

            The #1 choice for boat owners. Period.

            Stop Wasting Time With Dead Batteries!

            Consider the benefits of switching to an Abyss Battery. Save space, weight, and have piece mind knowing you're using some of the best marine batteries in business!

            Order Now!