- DescriptionThe MonoLith 12.8V 690Ah Lithium Battery is built for those who need serious, long-lasting energy storage from a 12V system. With 690 ampere-hours of capacity using premium REPT cells, the MonoLith delivers the kind of sustained power that keeps you completely off-grid for extended periods — without compromise.Whether you’re running a large caravan or motorhome with air conditioning, a marine vessel with demanding electronics, or a mobile off-grid setup that needs to handle high-draw appliances, the MonoLith has the capacity and the current delivery to handle it.Key specificationsNominal voltage: 12.8VCapacity: 690Ah (REPT cells)BMS: 300A with Bluetooth connectivityChemistry: LiFePO4 (Lithium Iron Phosphate)Case: IP67 Identical across all MonoLith models — standardised heavy-duty case designWarranty: 10-year warrantyParallel ready: 2 sets of positive and negative connections. Built with REPT cellsThe MonoLith 12.8V features REPT ESS-grade cells, which are superior in energy density with high capacity per volume. REPT cells are well-suited to demanding energy storage applications, delivering consistent power output over an extended lifespan.300A BMS with BluetoothThe integrated 300A BMS (Battery Management System) provides comprehensive protection from damage due to faults such as over/under voltage or over current. Connect via Bluetooth using apps available for iPhone and Android to monitor charging and discharging status in real time — a handy tool for keeping tabs on your system and for fault-finding. There’s even a power button to shut the battery down while you do any system maintenance or long term storage.Who is the MonoLith 12V for?The MonoLith 12.8V 690Ah suits owners of large caravans, motorhomes and RVs who want maximum energy storage from a single battery. It’s also an excellent choice for marine vessels, mobile workshops, and off-grid setups where high capacity and reliable 12V power delivery are essential. If you’re running high-draw appliances like air conditioning, induction cooktops, microwaves or large inverters, the MonoLith gives you the stored energy to do it comfortably.The case design suits any setup. It can be mounted under a caravan attached to the chassis rails (you will need to fabricate suitable mounts), under a bed or bench seat, or even upright against a wall. It comes with a venting option as standard, to help installations comply with Australian Standards.Power Connections are supplied with the battery using waterproof Amphenol type crimp connectors. The 2 sets of parallel connections can be used to spread the load, or to help with adding more batteries or daisy chain arrangement. Fittings for venting or sealing are also supplied.Every unit is calibrated, load-tested and fully cycled at least twice to confirm and rate its capacity and quality. We use quality parts sourced from Australian suppliers where possible, and our team of electronics specialists provides ongoing customer support directly — no outsourced call centres.Need help with installation? Find a trusted installer in your area, or contact PowerPaul® Australia today to learn more about the MonoLith 12.8V 690Ah Lithium Battery.SpecificationsRated Capacity690 Ah lithium battery (approx. 8,832Wh)BMSJK BMS with active balancer and power buttonDimensions730mm L, 285mm W, 195mm HWeight67kgVoltage12.8v NominalBMS currentDischarge/Charge 300A continuous. 450A peak (30 seconds). NO direct Alternator Charging.Connecting to other batteriesParallel connection to other identical batteries is allowed (must be same voltage first). Series connection is not allowed.Warranty10 Year warranty against manufacturing defects or failure.
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