Next Generation Ultra Slim 400Ah LiFePO4 Battery | 380A BMS

🔋 CUSTOM LITHIUM NEXT GENERATION ULTRA SLIM 400AH LiFePO4 BATTERY – AUSTRALIAN MADE

400Ah • 12.8V LiFePO4 • 380A Continuous Discharge • 116mm Battery Thickness • 200A Recommended Charge • 41.5kg • 7 Year Warranty

The Custom Lithium Next Generation Ultra Slim 400Ah Battery delivers serious off-grid energy storage in a low-profile aluminium package designed for installations where conventional high-capacity batteries simply take up too much space.

With a battery-body thickness of only 116mm, it provides a substantial 400Ah of LiFePO4 capacity while remaining suitable for canopy walls, false floors, custom vehicle storage systems and other space-conscious caravan, 4WD and off-grid installations.

A stated 380A continuous discharge capability, premium A-grade automotive LiFePO4 cells, high-current Heltech BMS and active cell balancing give the 400Ah model the current capability required for demanding 12V systems and appropriately engineered high-power inverter installations.

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⭐ KEY FEATURES

🔋 Massive 400Ah LiFePO4 Capacity
Provides substantial stored energy for extended touring, caravan, canopy and high-demand off-grid electrical systems.

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

📏 Low-Profile 116mm Battery Body
Provides 400Ah of lithium capacity in a battery body only 116mm thick, making it suitable for installations where available depth is restricted.

🔌 200A Recommended Charge Current
The supplied specification recommends up to 200A charging, allowing the battery to take advantage of suitably engineered high-output charging systems.

🔩 Mounting Rail System
The Next Generation enclosure incorporates a mounting-rail arrangement to assist with secure installation in suitable vehicle, canopy and off-grid applications.

🛡️ Lightweight Aluminium Enclosure
The custom aluminium housing provides a strong, low-profile structure while helping protect the cells and internal components.

🧠 High-Current Heltech BMS
The battery management system helps safeguard against overheating and over-discharge while managing battery operation.

⚖️ 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 touring and off-grid applications.

🚙 Built for 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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📐 400AH FOR SPACE-CONSCIOUS INSTALLATIONS

The Next Generation Ultra Slim range is designed to maximise battery capacity while minimising the depth required for installation.

Suitable applications can include:

• Along canopy walls
• Under false floors
• Inside custom 4WD storage systems
• Caravans & camper trailers
• Motorhomes & RVs
• Mobile trade setups
• Remote-work & high-capacity off-grid systems

The battery body measures approximately 610mm L × 405mm H × 116mm W.

The stated overall dimensions are 645mm L × 475mm H × 119mm W.

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🔩 IMPORTANT MOUNTING RAIL INFORMATION

When installing the Next Generation Ultra Slim battery along the base of a canopy or similar horizontal surface, Custom Lithium recommends not using the bottom mounting rail.

This allows the substantial battery weight to be supported directly by the vehicle or canopy floor instead of loading the lower mounting system.

⚠️ For base-mounted canopy installations, support the battery directly on the floor as recommended by Custom Lithium. This reduces stress on the mounting system and is intended to improve long-term stability.

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🚐 SERIOUS OFF-GRID POWER

With 400Ah of lithium capacity and substantial continuous-current capability, the Next Generation Ultra Slim can support compatible equipment including:

• ❄️ 12V fridges & freezers
• 💡 Vehicle & camp lighting
• 📡 Starlink
• 💻 Computers & electronics
• 📷 Cameras & charging equipment
• 💨 Air compressors
• 🛠️ Compatible tools & battery chargers
• ☕ Coffee machines through an appropriate 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 high-current Heltech BMS and active cell balancing.

The supplied product information describes LiFePO4 as a suitable battery chemistry for demanding mobile and off-grid applications where safety, reliability and high-current performance are important.

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📊 TECHNICAL SPECIFICATIONS

Capacity: 400Ah

Nominal Voltage: 12.8V

Continuous Discharge: 380A

Recommended Charge Current: 200A

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: 610mm L × 405mm H × 116mm W

Overall Dimensions: 645mm L × 475mm H × 119mm W

Weight: Approx. 41.5kg

Battery Chemistry: LiFePO4

Cells: Premium A-Grade Automotive LiFePO4

BMS: Heltech High-Current BMS

Cell Balancing: Active Balancer

Enclosure: Aluminium

Warranty: 7 Years

Manufactured: Brisbane, Australia

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⚡ HIGH-CURRENT PERFORMANCE

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

This makes the 400Ah model suitable for appropriately engineered high-power inverter installations, but inverter selection must still account for actual DC current demand, start-up surge, cable sizing, fuse protection, battery state of charge, connection quality and BMS limits.

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🔌 HIGH-CAPACITY CHARGING

The supplied specifications recommend a charge current of up to 200A.

• Recommended Charge Current: 200A
• Bulk / Charge Voltage: 14.2–14.6V
• Absorption / Float Voltage: 13.4–13.6V

Lower-output compatible charging systems can also be used, although recharge time will increase accordingly.

For a battery of this capacity, the complete charging strategy should consider available alternator charging, solar capacity and 240V mains charging rather than relying on a single charging source.

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🇦🇺 AUSTRALIAN MADE

Custom Lithium states that the Next Generation Ultra Slim 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 NOTES

• Use the stated overall dimensions when checking available installation space
• Battery body thickness is approximately 116mm
• Overall stated thickness is approximately 119mm
• Do not use the bottom mounting rail when installed along the base of a canopy or similar supported horizontal surface, as recommended by Custom Lithium
• Battery weight should be supported directly by the vehicle or canopy floor in this orientation
• Professional installation by a qualified auto electrician is recommended
• Product colour may vary slightly from displayed images

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❓ QUICK FAQ

How thick is the Next Generation Ultra Slim 400Ah battery?

The battery body is approximately 116mm thick, with a stated overall installation thickness of approximately 119mm.

Where can the 400Ah Ultra Slim battery be installed?

It is designed for space-conscious installations such as canopy walls, beneath false floors, custom 4WD storage areas, caravans, motorhomes and other high-capacity off-grid applications.

Should I use the bottom mounting rail when mounting it on a canopy floor?

No. Custom Lithium recommends that when the battery is installed along the base of a canopy or similar surface, the bottom mounting rail should not be used. The battery should instead be supported directly by the floor.

Can this battery run a large inverter?

It can be used as part of an appropriately engineered high-power inverter system. The supplied continuous discharge rating is 380A, but suitable inverter size depends on actual DC current demand, surge requirements, cable sizing, fusing and BMS limits.

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 200A. Lower-output compatible charging systems can also be used, but will increase recharge time.

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🔋 400AH & 380A CONTINUOUS – IN A 116MM-THICK BATTERY BODY

With 400Ah of LiFePO4 capacity, 380A continuous discharge capability, active balancing and a low-profile aluminium enclosure, the Custom Lithium Next Generation Ultra Slim 400Ah is built for serious off-grid systems where large energy capacity needs to fit into a restricted installation space.

Serious capacity. High-current performance. Australian made.