{"product_id":"custom-lithium-ultra-slim-xl-1250ah-lifepo4-battery","title":"Next Generation Ultra Slim XL 1250Ah LiFePO4 Battery | 380A BMS","description":"\u003cdiv style=\"font-weight: bold;\"\u003e\n\u003ch2 style=\"color: #dd1d1d;\"\u003e🔋 CUSTOM LITHIUM NEXT GENERATION ULTRA SLIM XL 1250AH LiFePO4 BATTERY – AUSTRALIAN MADE\u003c\/h2\u003e\n\u003ch3 style=\"color: #00aaff;\"\u003e1250Ah • 12.8V LiFePO4 • 380A Continuous Discharge • Modified Heltech BMS • Low-Temperature Protection • 102kg • 7 Year Warranty\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003eCustom Lithium Next Generation Ultra Slim XL 1250Ah Battery\u003c\/strong\u003e is designed for exceptionally high-capacity off-grid electrical systems where extended runtime and substantial stored energy are the priority.\u003c\/p\u003e\n\u003cp\u003eWith an enormous \u003cstrong\u003e1250Ah of LiFePO4 capacity\u003c\/strong\u003e in a purpose-built aluminium enclosure, this battery is aimed at serious caravan, motorhome, canopy, remote-work and high-demand off-grid installations where a conventional multi-battery bank would consume significant space.\u003c\/p\u003e\n\u003cp\u003eA stated \u003cstrong\u003e380A continuous discharge capability\u003c\/strong\u003e, 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.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3 style=\"color: #00aaff;\"\u003e⭐ KEY FEATURES\u003c\/h3\u003e\n\u003cp\u003e\u003cspan style=\"color: #80ff00;\"\u003e🔋 Massive 1250Ah LiFePO4 Capacity\u003c\/span\u003e\u003cbr\u003eProvides exceptional stored energy for large off-grid electrical systems and applications requiring extended operation between charging opportunities.\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: #80ff00;\"\u003e⚡ 380A Continuous Discharge\u003c\/span\u003e\u003cbr\u003eHigh-current capability supports demanding 12V loads and appropriately designed high-power inverter systems.\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: #80ff00;\"\u003e🧠 Modified Heltech High-Current BMS\u003c\/span\u003e\u003cbr\u003eThe supplied product information specifies a modified Heltech BMS designed to provide protection against overheating, over-discharge and low-temperature charging conditions.\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: #80ff00;\"\u003e❄️ Low-Temperature Cut-Off Protection\u003c\/span\u003e\u003cbr\u003eThe BMS is stated to incorporate low-temperature cut-off protection to help protect the battery when temperatures are unsuitable for charging.\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: #80ff00;\"\u003e⚖️ Active Cell Balancing\u003c\/span\u003e\u003cbr\u003eThe integrated active balancer helps manage individual cells and maintain consistent battery performance.\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: #80ff00;\"\u003e🔋 Premium A-Grade Automotive LiFePO4 Cells\u003c\/span\u003e\u003cbr\u003eBuilt using premium lithium iron phosphate cells for demanding mobile and off-grid applications.\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: #80ff00;\"\u003e🛡️ Aluminium Enclosure\u003c\/span\u003e\u003cbr\u003eThe custom aluminium housing is designed to protect the battery cells and internal components while packaging very high capacity into a purpose-built enclosure.\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: #80ff00;\"\u003e🚙 Designed for Rugged Touring Conditions\u003c\/span\u003e\u003cbr\u003eInternal components are insulated against vibration to help protect the system during corrugated-road and remote-area travel.\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: #80ff00;\"\u003e🧪 Individually Bench Tested\u003c\/span\u003e\u003cbr\u003eEach battery is individually bench tested before supply as part of Custom Lithium's quality-control process.\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: #80ff00;\"\u003e🇦🇺 Australian Made\u003c\/span\u003e\u003cbr\u003eBuilt in Brisbane and supplied as a certified Australian Made product.\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: #80ff00;\"\u003e🛡️ 7 Year Warranty\u003c\/span\u003e\u003cbr\u003eBacked by a full 7-year manufacturer warranty.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3 style=\"color: #00aaff;\"\u003e🚐 DESIGNED FOR SERIOUS OFF-GRID SYSTEMS\u003c\/h3\u003e\n\u003cp\u003eThe Ultra Slim XL 1250Ah is intended for installations where very high battery capacity is required without resorting to multiple conventional battery cases and interconnecting battery banks.\u003c\/p\u003e\n\u003cp\u003eSuitable applications can include:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eLarge caravans\u003c\/li\u003e\n\u003cli\u003eMotorhomes \u0026amp; RVs\u003c\/li\u003e\n\u003cli\u003eHigh-capacity 4WD canopy systems\u003c\/li\u003e\n\u003cli\u003eRemote-work vehicles\u003c\/li\u003e\n\u003cli\u003eMobile trade installations\u003c\/li\u003e\n\u003cli\u003eExtended off-grid touring systems\u003c\/li\u003e\n\u003cli\u003eHigh-demand inverter-based electrical systems\u003c\/li\u003e\n\u003cli\u003eApplications requiring long runtime between recharge opportunities\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3 style=\"color: #00aaff;\"\u003e🔩 IMPORTANT MOUNTING REQUIREMENTS\u003c\/h3\u003e\n\u003cp\u003eDue to the size and approximately \u003cstrong\u003e102kg weight\u003c\/strong\u003e of the Ultra Slim XL battery, Custom Lithium recommends that the battery be \u003cstrong\u003ehard mounted directly to the vehicle or canopy floor\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eThe supplied installation guidance allows the battery to be mounted either:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eFlat on its broad face surface\u003c\/li\u003e\n\u003cli\u003eOn one of its longer sides, in accordance with the manufacturer's installation guidance\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThis arrangement allows the battery mass to be fully supported by the vehicle or canopy floor rather than suspended from an unsupported mounting system.\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: #dd1d1d;\"\u003e⚠️ At approximately 102kg, this battery creates a substantial dynamic load in a moving vehicle. The supporting structure and mounting hardware must be engineered to safely withstand braking, cornering, vibration and rough-road loads.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: #dd1d1d;\"\u003e⚠️ Installation by a qualified auto electrician is recommended by Custom Lithium.\u003c\/span\u003e\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3 style=\"color: #00aaff;\"\u003e⚡ POWER FOR HIGH-DEMAND EQUIPMENT\u003c\/h3\u003e\n\u003cp\u003eWith 1250Ah of lithium capacity and substantial continuous-current capability, the Ultra Slim XL can support compatible equipment including:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e❄️ Multiple 12V fridges \u0026amp; freezers\u003c\/li\u003e\n\u003cli\u003e💡 Vehicle \u0026amp; camp lighting\u003c\/li\u003e\n\u003cli\u003e📡 Starlink\u003c\/li\u003e\n\u003cli\u003e💻 Computers \u0026amp; electronics\u003c\/li\u003e\n\u003cli\u003e📷 Cameras \u0026amp; charging equipment\u003c\/li\u003e\n\u003cli\u003e💨 Air compressors\u003c\/li\u003e\n\u003cli\u003e🛠️ Tools \u0026amp; battery chargers\u003c\/li\u003e\n\u003cli\u003e☕ Coffee machines through a suitable inverter\u003c\/li\u003e\n\u003cli\u003e🍳 Induction cooking through an appropriately engineered inverter system\u003c\/li\u003e\n\u003cli\u003e🔌 Compatible 240V appliances through a suitable inverter\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3 style=\"color: #00aaff;\"\u003e🔋 PREMIUM LiFePO4 CELL TECHNOLOGY\u003c\/h3\u003e\n\u003cp\u003eThe battery is constructed using \u003cstrong\u003eA-grade automotive LiFePO4 cells\u003c\/strong\u003e combined with a modified high-current Heltech BMS and active cell balancing.\u003c\/p\u003e\n\u003cp\u003eThe supplied product information describes LiFePO4 as suitable for demanding mobile and off-grid environments where safety, reliability and consistent electrical performance are important.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3 style=\"color: #00aaff;\"\u003e📊 TECHNICAL SPECIFICATIONS\u003c\/h3\u003e\n\u003cp\u003eCapacity: 1250Ah\u003c\/p\u003e\n\u003cp\u003eNominal Voltage: 12.8V\u003c\/p\u003e\n\u003cp\u003eContinuous Discharge: 380A\u003c\/p\u003e\n\u003cp\u003eRecommended Charge Current: 130A\u003c\/p\u003e\n\u003cp\u003eCharge Voltage: 14.2–14.6V\u003c\/p\u003e\n\u003cp\u003eAbsorption \/ Float Voltage: 13.4–13.6V\u003c\/p\u003e\n\u003cp\u003eLow-Voltage Cut-Off: 10.5V\u003c\/p\u003e\n\u003cp\u003eOperating Temperature: 0°C to 60°C\u003c\/p\u003e\n\u003cp\u003eTerminals: M10\u003c\/p\u003e\n\u003cp\u003eBattery Dimensions: 803mm L × 487mm H × 163mm W as supplied\u003c\/p\u003e\n\u003cp\u003eOverall Dimensions: 830mm L × 487mm W × 163mm H as supplied\u003c\/p\u003e\n\u003cp\u003eWeight: Approx. 102kg\u003c\/p\u003e\n\u003cp\u003eBattery Chemistry: LiFePO4\u003c\/p\u003e\n\u003cp\u003eCells: Premium A-Grade Automotive LiFePO4\u003c\/p\u003e\n\u003cp\u003eBMS: Modified Heltech High-Current BMS\u003c\/p\u003e\n\u003cp\u003eCell Balancing: Active Balancer\u003c\/p\u003e\n\u003cp\u003eLow-Temperature Cut-Off: Yes – exact threshold not supplied\u003c\/p\u003e\n\u003cp\u003eEnclosure: Aluminium\u003c\/p\u003e\n\u003cp\u003eWarranty: 7 Years\u003c\/p\u003e\n\u003cp\u003eManufactured: Brisbane, Australia\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3 style=\"color: #00aaff;\"\u003e⚡ 380A CONTINUOUS DISCHARGE\u003c\/h3\u003e\n\u003cp\u003eThe stated \u003cstrong\u003e380A continuous discharge capability\u003c\/strong\u003e provides substantial current availability for demanding auxiliary electrical systems.\u003c\/p\u003e\n\u003cp\u003eThis allows the Ultra Slim XL to form part of an appropriately engineered high-power inverter system, provided the inverter, DC cabling, fuse protection, isolation and terminal connections are correctly designed.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3 style=\"color: #00aaff;\"\u003e🔌 CHARGING REQUIREMENTS\u003c\/h3\u003e\n\u003cp\u003eThe supplied technical specification lists a recommended charge current of \u003cstrong\u003e130A\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eRecommended Charge Current: 130A\u003c\/li\u003e\n\u003cli\u003eBulk \/ Charge Voltage: 14.2–14.6V\u003c\/li\u003e\n\u003cli\u003eAbsorption \/ Float Voltage: 13.4–13.6V\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCompatible lower-output charging equipment can also be used, although recharge times will increase accordingly.\u003c\/p\u003e\n\u003cp\u003eFor a battery bank of this capacity, charging-system design is particularly important. A complete installation may incorporate:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eVehicle DC-DC charging\u003c\/li\u003e\n\u003cli\u003eLarge solar capacity\u003c\/li\u003e\n\u003cli\u003e240V mains charging\u003c\/li\u003e\n\u003cli\u003eMultiple appropriately coordinated charging sources\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3 style=\"color: #00aaff;\"\u003e❄️ LOW-TEMPERATURE BMS PROTECTION\u003c\/h3\u003e\n\u003cp\u003eThe supplied product information states that the modified Heltech BMS incorporates \u003cstrong\u003elow-temperature cut-off protection\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eThis is intended to provide additional battery protection where charging conditions fall outside suitable temperature limits.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3 style=\"color: #00aaff;\"\u003e\n\u003cspan style=\"color: rgb(128, 255, 0);\"\u003e🇦🇺\u003c\/span\u003e AUSTRALIAN MADE\u003c\/h3\u003e\n\u003cp\u003eCustom Lithium states that the Next Generation Ultra Slim XL battery is \u003cstrong\u003eAustralian Made certified\u003c\/strong\u003e and manufactured in Brisbane.\u003c\/p\u003e\n\u003cp\u003eEach battery is individually bench tested before supply and backed by a 7-year manufacturer warranty.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3 style=\"color: #00aaff;\"\u003e🛠️ INSTALLATION CONSIDERATIONS\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eApproximate battery weight: 102kg\u003c\/li\u003e\n\u003cli\u003eHard mounting directly to the vehicle or canopy floor is recommended\u003c\/li\u003e\n\u003cli\u003eBattery may be positioned flat or on one of its longer sides as specified by Custom Lithium\u003c\/li\u003e\n\u003cli\u003eSupporting structure must carry the full battery mass and dynamic vehicle loads\u003c\/li\u003e\n\u003cli\u003eAllow adequate clearance for M10 terminals and high-current cabling\u003c\/li\u003e\n\u003cli\u003eCorrect cable sizing, fuse protection and isolation are essential\u003c\/li\u003e\n\u003cli\u003eProfessional installation by a qualified auto electrician is recommended\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2 style=\"color: #dd1d1d;\"\u003e❓ QUICK FAQ\u003c\/h2\u003e\n\u003ch3 style=\"color: #00aaff;\"\u003eHow much capacity does the Ultra Slim XL 1250Ah provide?\u003c\/h3\u003e\n\u003cp\u003eThe battery provides a stated \u003cstrong\u003e1250Ah at 12.8V nominal\u003c\/strong\u003e, making it a very high-capacity solution for large off-grid electrical systems.\u003c\/p\u003e\n\u003ch3 style=\"color: #00aaff;\"\u003eHow should the 1250Ah battery be mounted?\u003c\/h3\u003e\n\u003cp\u003eCustom Lithium recommends hard mounting it 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.\u003c\/p\u003e\n\u003ch3 style=\"color: #00aaff;\"\u003eCan it run a large inverter?\u003c\/h3\u003e\n\u003cp\u003eIt 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.\u003c\/p\u003e\n\u003ch3 style=\"color: #00aaff;\"\u003eDoes it have low-temperature protection?\u003c\/h3\u003e\n\u003cp\u003eYes. The supplied product information states that the modified Heltech BMS incorporates low-temperature cut-off protection. The exact temperature threshold has not been supplied.\u003c\/p\u003e\n\u003ch3 style=\"color: #00aaff;\"\u003eWhat charging profile should I use?\u003c\/h3\u003e\n\u003cp\u003eThe supplied specifications call for a \u003cstrong\u003e14.2–14.6V charge voltage\u003c\/strong\u003e and \u003cstrong\u003e13.4–13.6V absorption\/float voltage\u003c\/strong\u003e.\u003c\/p\u003e\n\u003ch3 style=\"color: #00aaff;\"\u003eWhat charge current is recommended?\u003c\/h3\u003e\n\u003cp\u003eThe supplied recommended charge current is \u003cstrong\u003e130A\u003c\/strong\u003e. Lower-output compatible charging equipment can also be used, but recharge times will increase further.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2 style=\"color: #dd1d1d;\"\u003e🔋 1250AH OF EXTREME OFF-GRID ENERGY STORAGE\u003c\/h2\u003e\n\u003cp\u003eWith 1250Ah of LiFePO4 capacity, 380A continuous discharge capability, a modified Heltech BMS, active balancing and a purpose-built aluminium enclosure, the Custom Lithium Next Generation Ultra Slim XL 1250Ah is designed for serious electrical systems where very large stored energy capacity is the priority.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eExtreme capacity. High-current capability. Australian made.\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/div\u003e","brand":"CUSTOM LITHIUM","offers":[{"title":"Default Title","offer_id":48172969820408,"sku":"CL-USV3-1250","price":11999.0,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/9230\/4632\/files\/Front_on_2_-_Edited.webp?v=1774935329","url":"https:\/\/www.homeof12volt.com.au\/products\/custom-lithium-ultra-slim-xl-1250ah-lifepo4-battery","provider":"Home of 12 Volt Northern","version":"1.0","type":"link"}