Abyss Battery 12V 350Ah Dual Purpose Lithium Marine House Battery - AB-12V350-BT

Abyss Battery  12V 350Ah Dual Purpose Lithium Marine House Battery - AB-12V350-BT

The  is a high capacity performance Lithium-ion battery engineered with the strongest 200A BMS rating of its class. This battery is equipped with built in Bluetooth connection and ideal for off-grid living, energy storage applications, starting generators, and large outboard or diesel motors. Designed for powering Seakeeper systems, chill plates, microwaves, and A/C. This battery is a power house you can depend on. 

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.

What our Experts Think

• Extreme-capacity marine power: The ABYSS® AB-12V350-BT is a 12V 350Ah dual-purpose lithium battery designed for large-scale house loads and demanding marine electrical systems.
• Massive onboard energy reserve: Delivers long-duration power for electronics, refrigeration, lighting, pumps, and heavy accessory loads, ideal for extended offshore or liveaboard use.
• Dual-purpose capability: Engineered to support both house power and engine starting support functions, reducing the need for multiple battery banks.
• Stable high-output performance: Maintains consistent voltage under heavy load, ensuring reliable operation of sensitive marine electronics and inverters.
• Advanced LiFePO₄ safety system: Integrated BMS protection guards against overcharge, deep discharge, overheating, and short-circuit conditions.
• Heavy-duty marine construction: Built for harsh saltwater environments with vibration resistance and corrosion-resistant housing for long-term durability.
• High inverter compatibility: Suitable for powering larger AC loads when paired with inverters, supporting full onboard electrical independence.
• Long service lifespan: Rated for 3000+ charge cycles, offering significant long-term cost efficiency compared to traditional lead-acid banks.
• System simplification advantage: Replaces large multi-battery AGM setups with a single high-capacity lithium solution, reducing wiring complexity and weight.
• Professional offshore solution: Ideal for large boats, yachts, and serious offshore users needing maximum energy storage and reliability.

Q&A

Q: What is the Abyss Battery AB-12V350-BT used for?
A: A premium high-capacity 12V LiFePO₄ dual-purpose marine battery designed for large house loads and engine support in offshore boats, yachts, and off-grid marine power systems.

Q: What are the key specifications of the AB-12V350-BT?
A: 12.8V nominal voltage, 350Ah capacity (~4.48kWh energy), IP65 marine-grade enclosure, Bluetooth BMS monitoring, and a heavy-duty 200A continuous discharge rating.

Q: What makes it “dual purpose”?
A: It is engineered for both high-demand engine starting support and deep-cycle house power, capable of running large marine systems like refrigeration, A/C, Seakeeper stabilization, and navigation electronics.

Q: How powerful is its discharge capability?
A: It supports up to ~200A continuous discharge with high peak surge capability for engine cranking and heavy load spikes.

Q: Does it support Bluetooth monitoring?
A: Yes, integrated Bluetooth BMS provides real-time monitoring of state of charge, voltage, current, temperature, and battery health via mobile app.

Q: What is the cycle life?
A: Around 3000 cycles at full depth of discharge and up to 6000 cycles at lighter discharge levels, significantly outlasting lead-acid batteries.

Q: What systems is it best suited for?
A: Offshore fishing boats, luxury yachts, and commercial marine systems needing a single high-capacity battery for both starting support and heavy house loads like electronics and appliances.

Q: Is it safe for marine environments?
A: Yes, it uses sealed LiFePO₄ chemistry with an integrated BMS and rugged construction designed for vibration, saltwater exposure, and harsh offshore conditions.

Maintenance Tips

• Correct charging profile: Use only a LiFePO₄ charger set to 14.4V ±0.2V. Avoid AGM/lead-acid modes to prevent BMS imbalance or premature cutoff.
• Avoid deep discharge: Recharge before 20–30% SOC to maximize lifespan (up to ~3000 cycles at full depth of discharge).
• Respect high-current design: Do not exceed 200A continuous discharge / 800A peak (short burst)—important when running inverters, A/C, or Seakeeper loads.
• Temperature control:
• Charge: 0°C to 55°C
• Discharge: −20°C to 60°C
  Avoid charging below freezing unless built-in heating system is active (if equipped).
• Bluetooth monitoring: Regularly check SOC, voltage, temperature, and current to detect imbalance, alternator issues, or parasitic draw early.
• Proper storage: Store at 50–70% charge in a cool, dry environment; avoid full charge storage in heat for long periods.
• Terminal maintenance: Tighten M8 terminals to spec—loose high-current connections can cause heat buildup and voltage drop.
• Marine protection: Even with sealed housing, rinse salt/dust buildup and keep connectors dry to prevent corrosion resistance increase.
• Parallel system discipline: Only connect batteries at equal voltage/SOC to avoid BMS stress and imbalance.
• Load balancing habit: For large inverter systems (A/C, microwave, etc.), stagger startup loads to reduce surge stress.