The Clayton Power Li-G4 280Ah is a professional-grade lithium iron phosphate battery designed for motorhomes, caravans, campervans, and marine applications. Built with LiFePO4 chemistry, this 12V system delivers 3,584Wh total capacity with 3,008Wh usable energy. The battery handles continuous discharge at 200A and features an integrated Battery Management System that protects against overcharge, deep discharge, and overheating whilst maintaining cell balance.
This isn't a budget leisure battery. At 28kg, it's substantially heavier than the 100Ah variant, but you're getting nearly three times the usable capacity. The unit measures 243mm high, 197mm wide, and 438mm long, so check your battery box dimensions before ordering. It'll charge at up to 140A continuously and operates between -20°C and 50°C for discharge, though charging requires 0-50°C. The IP54 rating means it'll cope with splashes but shouldn't be left exposed to weather. Most owners pair this with Clayton's DC-DC converters for alternator charging or use it with their LPS II system for capacity extension.
Here's what you need to know about longevity. Clayton rates this for over 2,800 cycles at 80% depth of discharge before capacity drops to 70% of original. That's roughly eight years of daily use. You'll need to charge it fully every six months if stored, and professional installation is recommended given the high currents involved. The battery communicates via CAN bus and includes two M12 connectors plus an M4 wake-up terminal for remote control. It's UN3480 certified for transport and carries a 24-month warranty.
Clayton Power Li-G4 100Ah 12V Lithium Leisure Battery Features
Double the transfer power to 1200W using 2x Converters
Capacity extension to the LPS
Including 600W DC-DC Converter
Double the transfer power to 1200W using 2x Converters
Safe battery technology – LiFePO4
Integrated Battery Management System (BMS) : Cell-balancing for high performance and precise State of Charge (SOC).
Ready for parallel connection with the LPS
Integrated power switch
Designed for heavy duty environments and requirements
Metal frame and flame-retardant enclosure : Vibration and safety tested for leisure, industrial and automotive use.
High-energy density Li-Ion Battery Cells : High-end and compact LiFePO4 battery cells with high energy density and long lifetime.
Specifications
Battery type: LiFePO4
Capacity: 280 Ah (3584 Wh)
Effective capacity: 235 Ah (3008 Wh)
Continuous discharge current: 200 A
Continuous charging current: 140 A
Cycles: 6000 @ (25 °C, 80% DOD)
Nominal battery voltage: 12.8 VDC
Charging voltage: 14.4 VDC
Discharge voltage: 10.8 VDC
Connection terminals: M8 screw
Weight: 28 kg
Dimensions in mm (HxWxL): 234.4 x 197 x 438.3
Frequently Asked Questions
What's the real usable capacity of the Clayton Li-G4 280Ah battery?
The Li-G4 280Ah provides 3,008Wh of usable energy from its 3,584Wh total capacity. Clayton's Battery Management System reserves approximately 576Wh to protect the cells from damage, which extends the battery's lifespan beyond 2,800 cycles. This means you get roughly 235Ah of accessible capacity under normal operating conditions.
Can I charge this battery from my motorhome alternator?
Yes, but you'll need a Clayton Power DC-DC converter as an intermediary. The manual specifically recommends either the CD1804 (45A charging) or CD2402 (90A charging) models. Direct connection to your alternator isn't safe or effective because standard alternators don't provide the charging profile that lithium batteries require, and the battery's 140A maximum charge current could overload your vehicle's electrical system without proper regulation.
How long does the Li-G4 280Ah battery last before replacement?
Clayton specifies over 2,800 cycles at 80% depth of discharge before the battery degrades to 70% of its original capacity. If you're using the battery daily in a motorhome, this translates to approximately 7-8 years of service life. Weekend users who cycle the battery less frequently should expect 10-15 years. The Battery Management System's cell balancing and protection features are designed to maximise this lifespan by preventing the conditions that typically degrade lithium cells.
What size cables and fuses do I need for installation?
The manual mandates minimum 35mm² high-flex cable (Class 5 or 6) for the main power connections when using the battery at its full 200A continuous discharge rating. You'll need a 125A fuse positioned as close to the positive terminal as possible. The M8 terminals require 12Nm torque with both spring and flat washers. If you're running lower currents, 16mm² cable with a 60A fuse is acceptable, but most motorhome installations should use the heavier specification to allow for peak loads from inverters or high-draw appliances.
Does the Li-G4 work in freezing temperatures?
The battery discharges down to -20°C without issues, so you can run your appliances in winter conditions. Charging is a different matter. The Battery Management System prevents charging below 0°C to protect the cells from lithium plating, which permanently damages capacity. The LED indicator bar turns red when the battery is too cold for charging. If you're winter camping, you'll need to warm the battery above freezing before connecting mains hookup or running your alternator charging system.
Can I connect multiple Li-G4 batteries together?
Parallel connection is supported only when used with Clayton's LPS II system for capacity extension. The batteries communicate via CAN bus to synchronise their charge and discharge cycles. You cannot simply wire multiple Li-G4 batteries together without the LPS II controller, as this creates imbalanced charging and voids your warranty. Series connection to create 24V systems is explicitly not supported by Clayton. If you need more capacity as a standalone battery, you'll need to work within the single-battery limitation of 280Ah.
What happens if I don't charge the battery for several months?
Clayton's manual explicitly states you must fully charge the Li-G4 every six months during storage, and this requirement is repeated multiple times throughout the documentation. Lithium batteries self-discharge slowly, and if cells drop too low, the Battery Management System enters a protective state that can be difficult to recover from. Store the battery between 0°C and 35°C when not in use. Failing to maintain the battery during storage periods will void your warranty and potentially damage the cells beyond recovery.
Is professional installation really necessary for this battery?
Clayton recommends professional installation for good reason. The battery is classified as UN3480 Class 9 dangerous goods due to its energy density, and incorrect installation creates genuine fire and explosion risks. The manual specifies requirements for cable sizing, fuse placement, torque settings, and electrical isolation that aren't intuitive to DIY installers. You're working with currents up to 200A continuous, and mistakes cause cable fires or battery damage. Unless you're competent with high-current 12V systems and understand the specific requirements of lithium battery installation, professional fitting is worth the cost.
What's the difference between the 280Ah and 100Ah Li-G4 models?
The 280Ah version provides 235Ah usable capacity compared to 80Ah in the 100Ah model. Physical size increases from 187x197x343mm to 243x197x438mm, and weight jumps from 12kg to 28kg. Maximum continuous discharge rises from 175A to 200A, whilst charging capacity increases from 100A to 140A. The 280Ah model costs significantly more but delivers nearly three times the energy storage, making it appropriate for larger motorhomes with higher power demands or extended off-grid periods. Both models use identical Battery Management Systems and share the same temperature ranges and cycle life specifications.
How does the Battery Management System protect the Li-G4?
The integrated BMS monitors each of the four cells individually, disconnecting power if any cell exceeds 3.65V during charging or drops below 2.50V during discharge. It prevents charging above 65°C or below -30°C to protect against thermal damage. The system includes overcurrent protection at 140A for charging and 200A for discharge, plus short-circuit protection with a non-replaceable 400A internal fuse. Cell balancing occurs during charging at 1A per cell to keep all four cells at equal voltage levels. When errors occur, the LED bar flashes red with a code indicating the specific fault, and most errors clear automatically when you turn the battery off and back on.
If you’ve changed your mind about keeping your purchase, please return it in its original condition with proof of purchase and we’ll exchange or refund it. Unless faulty, this should be within 100 days of receiving your order. By original condition, we’d expect this to mean that you’ve kept packaging and labels, and that the item is undamaged and unused.
For further information of how to return your item, please visit the "Returning an Unwanted/Faulty/Damaged Item" section on our Help Page.
Did you know we have been established and have been in the caravan and motorhome industry for over 50 years?
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