Next Generation Ultra Slim XL 1120Ah LiFePO4 Battery | 380A BMS

🔋 CUSTOM LITHIUM NEXT GENERATION ULTRA SLIM XL 1120AH LiFePO4 BATTERY – AUSTRALIAN MADE

1120Ah • 12.8V LiFePO4 • 380A Continuous Discharge • Modified Heltech BMS • Active Balancing • Aluminium Enclosure • 100kg • 7 Year Warranty

The Custom Lithium Next Generation Ultra Slim XL 1120Ah Battery is designed for very large off-grid electrical systems requiring exceptional energy storage in a single purpose-built lithium battery.

With an enormous 1120Ah of LiFePO4 capacity, the Ultra Slim XL is aimed at high-demand caravan, motorhome, canopy and remote-power installations where extended runtime and substantial usable energy are priorities.

A stated 380A continuous discharge capability, premium A-grade automotive LiFePO4 cells, modified high-current Heltech BMS and active cell balancing provide the foundation for demanding 12V systems and appropriately engineered high-power inverter installations.

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⭐ KEY FEATURES

🔋 Massive 1120Ah LiFePO4 Capacity
Provides exceptional stored energy for serious off-grid systems, large caravans, motorhomes, canopies and remote-work installations.

⚡ 380A Continuous Discharge
High-current capability supports demanding 12V loads and appropriately designed inverter systems.

🛡️ Modified Heltech BMS
The supplied product information specifies a modified Heltech BMS designed to protect against overheating, over-discharge and low-temperature charging conditions.

❄️ Low-Temperature Cut-Off Protection
The BMS is stated to incorporate low-temperature cut-off protection to help protect the battery in unsuitable charging conditions.

⚖️ Active Cell Balancing
The integrated active balancer helps manage individual cells and maintain consistent battery performance.

🔋 Premium A-Grade Automotive LiFePO4 Cells
Built using premium lithium iron phosphate cells for demanding mobile and off-grid applications.

🛡️ Aluminium Enclosure
The custom aluminium enclosure is designed to protect the cells while packaging substantial capacity into a purpose-built form factor.

🚙 Designed for Rugged Touring Conditions
Internal components are insulated against vibration to help protect the battery during corrugated-road and remote-area travel.

🧪 Individually Bench Tested
Each battery is individually bench tested before supply as part of Custom Lithium's quality-control process.

🇦🇺 Australian Made
Built in Brisbane and supplied as a certified Australian Made product.

🛡️ 7 Year Warranty
Backed by a full 7-year manufacturer warranty.

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🚐 BUILT FOR LARGE OFF-GRID SYSTEMS

The Ultra Slim XL 1120Ah is intended for systems where battery capacity is a major priority and extended operation away from mains power is required.

Suitable applications can include:

• Large caravans
• Motorhomes & RVs
• High-capacity 4WD canopy systems
• Remote-work vehicles
• Mobile trade installations
• Long-duration off-grid systems
• High-demand inverter-based electrical systems

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🔩 IMPORTANT MOUNTING REQUIREMENTS

Due to the size and weight of the Ultra Slim XL battery, Custom Lithium recommends that it be hard mounted directly to the vehicle or canopy floor.

The supplied installation guidance allows the battery to be mounted either:

• Flat on its broad face surface
• On one of its longer sides, as shown in the manufacturer's installation examples

This allows the battery's weight to be fully supported by the floor rather than relying on a mounting rail or unsupported bracket arrangement.

⚠️ At approximately 100kg, this battery requires substantial structural support and secure mechanical retention. The installation must account for vehicle movement, braking loads, vibration and rough-road conditions.

⚠️ Custom Lithium recommends installation by a qualified auto electrician.

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⚡ SERIOUS POWER FOR HIGH-DEMAND EQUIPMENT

With 1120Ah of stored capacity and substantial continuous-current capability, the Ultra Slim XL can support compatible equipment including:

• ❄️ Multiple 12V fridges & freezers
• 💡 Vehicle & camp lighting
• 📡 Starlink
• 💻 Computers & electronics
• 📷 Cameras & charging equipment
• 💨 Air compressors
• 🛠️ Tools & battery chargers
• ☕ Coffee machines through a suitable inverter
• 🍳 Induction cooking through an appropriately engineered inverter system
• 🔌 Compatible 240V appliances through a suitable inverter

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🔋 PREMIUM LiFePO4 CELL TECHNOLOGY

The battery is constructed using A-grade automotive LiFePO4 cells combined with a modified high-current Heltech BMS and active cell balancing.

The supplied product information describes LiFePO4 as suitable for demanding environments where safety, reliability and consistent electrical performance are important.

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📊 TECHNICAL SPECIFICATIONS

Capacity: 1120Ah

Nominal Voltage: 12.8V

Continuous Discharge: 380A

Recommended Charge Current: 130A

Charge Voltage: 14.2–14.6V

Absorption / Float Voltage: 13.4–13.6V

Low-Voltage Cut-Off: 10.5V

Operating Temperature: 0°C to 60°C

Terminals: M10

Battery Dimensions: 803mm L × 487mm H × 163mm W as supplied

Overall Dimensions: 830mm L × 487mm W × 163mm H as supplied

Weight: Approx. 100kg

Battery Chemistry: LiFePO4

Cells: Premium A-Grade Automotive LiFePO4

BMS: Modified Heltech High-Current BMS

Cell Balancing: Active Balancer

Low-Temperature Cut-Off: Yes, exact threshold not supplied

Enclosure: Aluminium

Warranty: 7 Years

Manufactured: Brisbane, Australia

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⚡ 380A CONTINUOUS DISCHARGE

The stated 380A continuous discharge capability provides substantial current availability for demanding auxiliary electrical systems.

This allows the Ultra Slim XL to form part of an appropriately engineered high-power inverter system, provided the inverter, DC cabling, fuse protection, terminals and complete installation are correctly designed.

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🔌 CHARGING REQUIREMENTS

The supplied specification lists a recommended charge current of 130A.

• Recommended Charge Current: 130A
• Bulk / Charge Voltage: 14.2–14.6V
• Absorption / Float Voltage: 13.4–13.6V

Compatible lower-output charging equipment can also be used, but recharge times will increase accordingly.

With an 1120Ah battery bank, the overall charging strategy should be considered carefully. Depending on the application, this may involve a combination of DC-DC charging, solar and 240V mains charging.

⚠️ A battery of this capacity can require substantial recharge time. Charger output, available alternator capacity, solar array size, mains charging capability and typical daily energy consumption should all be considered when designing the complete system.

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❄️ LOW-TEMPERATURE BMS PROTECTION

The supplied product information states that the modified Heltech BMS incorporates low-temperature cut-off protection.

This provides additional battery protection where charging temperatures fall outside acceptable limits.

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🇦🇺 AUSTRALIAN MADE

Custom Lithium states that the Ultra Slim XL battery is Australian Made certified and manufactured in Brisbane.

Each battery is individually bench tested before supply and backed by a 7-year manufacturer warranty.

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🛠️ INSTALLATION CONSIDERATIONS

• Approximate battery weight: 100kg
• Hard mounting directly to the vehicle or canopy floor is recommended
• Battery may be positioned flat or on one of its longer sides as specified by Custom Lithium
• Installation structure must support the full battery mass
• Allow clearance for M10 terminals and heavy-current cabling
• Correct cable sizing, fuse protection and isolation are essential
• Professional installation by a qualified auto electrician is recommended

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❓ QUICK FAQ

How much capacity does the Ultra Slim XL provide?

The battery provides a stated 1120Ah at 12.8V nominal, making it one of the highest-capacity batteries in the Custom Lithium Ultra Slim range.

How should the 1120Ah battery be mounted?

Custom Lithium recommends hard mounting the battery directly to the vehicle or canopy floor, either flat on its broad face or supported on one of its longer sides in accordance with the manufacturer's installation guidance.

Can this battery run a large inverter?

It can form part of an appropriately engineered high-power inverter system. The supplied continuous discharge rating is 380A, so inverter selection must consider actual DC current demand, surge requirements, cabling, fuse protection and BMS limitations.

Does it have low-temperature protection?

Yes. The supplied product information states that the modified Heltech BMS incorporates low-temperature cut-off protection. The exact temperature threshold has not been supplied.

What charging profile should I use?

The supplied specifications call for a 14.2–14.6V charge voltage and 13.4–13.6V absorption/float voltage.

What charge current is recommended?

The supplied recommended charge current is 130A. Lower-output compatible charging equipment can also be used but will further increase recharge time.

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🔋 1120AH OF SERIOUS OFF-GRID ENERGY STORAGE

With 1120Ah of LiFePO4 capacity, 380A continuous discharge capability, a modified Heltech BMS, active cell balancing and a purpose-built aluminium enclosure, the Custom Lithium Next Generation Ultra Slim XL is designed for large electrical systems where long-term off-grid energy storage is the priority.

Extreme capacity. Purpose-built protection. Australian made.