Abyss Battery 12V 240Ah Dual Purpose Lithium Marine Battery - AB-12V240-BT

Abyss Battery  12V 240Ah Dual Purpose Lithium Marine Battery - AB-12V240-BT

The  is a high capacity Group 49 Lithium-Iron-Phosphate battery engineered with the strongest 200A BMS rating of its class and designed with mid-sized center console boats power needs in mind. The 12V 240Ah has dual purpose capabilities and features making it ideal for starting outboard motors and supplying enough power for worry free overnight trips at sea.

This battery will also accept charge from your engine’s alternator with no additional equipment necessary and is equipped with built-in Bluetooth connectivity, which allows the user to wirelessly monitor battery health, operation status and troubleshoot diagnostics. Our dual purpose lithium battery is ideal for powering Seakeeper systems, A/C refrigeration, chill plates, and other high energy storage applications. 

What our Experts Think

• Extreme-capacity marine power bank – The AB-12V240-BT is engineered as a 240Ah LiFePO₄ dual-purpose battery, delivering massive usable energy for extended offshore trips, high-demand electronics, and overnight marine autonomy.
• True dual-purpose design – Built to handle both engine starting and deep-cycle loads, making it suitable for powering outboards while also running heavy onboard systems like refrigeration, electronics, and navigation equipment.
• High-output BMS performance – Features a robust 200A continuous discharge BMS with high peak surge capability, ensuring reliable cranking power and stable high-load output under demanding conditions.
• Massive usable energy (no wasted capacity) – Unlike lead-acid systems, LiFePO₄ chemistry provides near-full usable capacity, delivering longer runtime per charge cycle and more consistent voltage under load.
• Bluetooth smart monitoring – Integrated Bluetooth BMS allows real-time tracking of state of charge, voltage, temperature, and diagnostics, improving safety and trip planning efficiency.
• Marine-grade durability built for harsh environments – Designed with sealed construction, vibration resistance, and IP-rated protection to withstand saltwater exposure and offshore conditions.
• System-ready integration – Alternator-compatible charging and multi-unit expandability make it suitable for larger boat electrical systems and modular energy upgrades.

Q&A

Maintenance Tips

• Use only a 14.4V LiFePO4-compatible charger (never lead-acid mode)
• Avoid deep discharge below 10V cutoff to protect the BMS
• Keep operating charge range at 0°C to 55°C for safe charging
• Store at 40–60% charge in cool, dry conditions (-5°C to 45°C)
• Recharge after each use to maximize cycle life (3000–6000 cycles)
• Do not leave at 100% charge for long storage periods
• Keep terminals clean, tight, and corrosion-free (marine salt protection is critical)
• Use Bluetooth app to monitor voltage, temperature, SOC, and health status
• Avoid exceeding 200A continuous discharge limit
• Ensure proper ventilation in boat compartments during heavy load use
• Protect from shock, vibration, and saltwater spray (IP65-rated, not submersible)
• Do not open or modify the internal BMS system
• Disconnect during long storage to prevent parasitic drain
• Allow battery to warm before heavy load use in cold conditions