Extralink Accumulator LiFePO4 40AH 12.8V BMS Battery 40000 mAh

The Extralink Accumulator LiFePO4 40AH 12.8V BMS Battery 40000 mAh is a maintenance‑free Lithium Iron Phosphate (LiFePO4) power source designed for applications that require a compact, lightweight, and long‑life 12.8 V battery. With a nominal capacity of 40 Ah and a built‑in battery management system (BMS), the unit delivers stable output, low self-discharge and improved charge/discharge efficiency compared with traditional lead‑acid cells. The battery is supplied as a single black unit weighing approximately 5.5 kg and is intended for repeated deep cycling and extended storage.

Advantages

LiFePO4 chemistry provides enhanced safety, thermal stability and a low risk of thermal runaway. The Extralink 40 Ah cell offers a high cycle life — typically more than 2,000 cycles while retaining around 80% of rated capacity — and a low self‑discharge rate (<3% per month), enabling longer storage without frequent recharge. The battery is considerably lighter and more energy‑dense than equivalent lead‑acid batteries, requires no active maintenance, and benefits from the integrated BMS that safeguards against overcharge, overdischarge and short circuits.

Suitable for

• Uninterruptible power supplies (UPS) and emergency backup systems
• Recreational vehicles (RVs), boats and marine electrical systems
• Telecommunications equipment and remote power installations
• Electric vehicles for auxiliary power, logistics vehicles and buses
• Portable power packs and off‑grid storage for small systems

Key specifications

• Nominal voltage: 12.8 V
• Nominal capacity: 40 Ah (40,000 mAh)
• Chemistry: Lithium Iron Phosphate (LiFePO4)
• Typical cycle life: >2,000 cycles to ~80% capacity
• Self‑discharge: <3% per month (typical)
• Weight: approximately 5.5 kg
• Colour: black
• Includes integrated battery management system (BMS) for protection

How to use

Install the battery in a dry, ventilated location with stable ambient temperature to maximize service life. Connect the positive and negative terminals following equipment manufacturer polarity guidance and ensure connections are secure and corrosion‑free. Use a charger or power system compatible with LiFePO4 charging profiles; if the system has configurable settings choose a charge voltage and cut‑off parameters recommended for 12.8 V LiFePO4 modules. Observe the BMS indications and allow the battery to reach full charge before first use when possible.

Recommendations

Store the battery at a partial state of charge (around 40–60%) if not used for extended periods, keep it in a cool, dry place, and perform a recharge every few months to prevent deep discharge. Avoid charging with lead‑acid specific bulk chargers that do not support LiFePO4 profiles, and do not expose the battery to temperatures outside the manufacturer’s recommended range. For installations with parallel connection or multiple units, verify BMS compatibility and follow safe connection practices to ensure balanced operation.