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ReliOn LiFePO4 Lithium Battery 36V 40Ah
ReliOn 36V 40Ah (1536Wh) LiFePO4 lithium deep cycle battery, designed for series/parallel connection in higher-voltage applications: marine electric motors, solar installations, and 36V motorhome systems. It's 70% lighter than its lead-acid equivalent (14 kg) and features an IP67 water-resistant housing. Zero maintenance and fast charging.
ReliOn LiFePO4 36V 40Ah Lithium Battery: Power and Lightness for High-Voltage Systems
The ReliOn RB36V40 is a lithium battery rated at 38.4V nominal and 40Ah (1536Wh), designed for those who need more voltage than a standard 12V battery, with the option to connect several units in series or parallel to adapt the system to their needs. It's a common choice for marine electric motors, higher-power solar installations, and 36V systems in motorhomes and specialty vehicles.
Use Cases: When a 36V Lithium Battery Makes Sense
Marine Electric Motors
With a compact footprint (Group 31) and a weight of just 14 kg — 70% less than its lead-acid equivalent — the RB36V40 is a popular choice for powering electric propulsion motors in boats, where every kilogram counts.
Higher-Voltage Solar Installations
This solar panel battery allows you to build 36V or higher energy banks by combining several units, reducing current losses in higher-power installations and simplifying wiring compared to series-connected 12V battery banks.
Motorhomes and 36V Systems
In motorhomes or vehicles with higher-voltage electrical systems, the RB36V40 offers the same reliability as the ReliOn range with the advantage of fewer units and fewer connections than an equivalent 12V bank.
Lithium Battery vs. Lead-Acid: Why Choose LiFePO4
Compared to an equivalent lead-acid battery, the RB36V40 offers greater usable depth of discharge, far more charge and discharge cycles over its lifespan, much lower weight, and an internal BMS that protects against overcharge, over-discharge, short circuit, and extreme temperatures. Its ABS and polycarbonate housing with IP67 protection makes it suitable for humid or demanding environments.
Installation and Compatibility
The RB36V40 can be connected in series or parallel with other compatible uni
REL-RB36V40
| Brand | ReliOn |
|---|---|
| Model | RB36V40 |
| Reference | REL-RB36V40 |
| Chemistry | LiFePO4 (Lithium Iron Phosphate) - Cylindrical cell |
| Nominal voltage | 38.4V |
| Nominal capacity | 40Ah |
| Energy | 1536Wh |
| Internal resistance | ≤50mΩ @ 50% SOC |
| Charge efficiency | 99% |
| Self-discharge | <3% per month |
| Continuous discharge current | 50A |
| Peak discharge current | 175A for 7.5s ± 2.5s |
| BMS - Over-current cutoff | 200A ±35A (100 ±50ms) |
| BMS - Under-voltage disconnect | 27.6V |
| BMS - Reconnect after under-voltage | 30.0V |
| Recommended charge current | 4A - 20A |
| Maximum charge current | 40A |
| BMS - Overcharge cutoff | 46.2V |
| BMS - Reconnect after overcharge | 43.8V |
| Discharge temperature | -20°C to 60°C |
| Charge temperature | -20°C to 45°C |
| Storage temperature | -5°C to 35°C |
| Dimensions | 329 x 172 x 214 mm |
| Weight | 14 kg |
| Terminals | M8 x 1.25 x 12mm |
| Case material | ABS & PC blend (UL94-V0) |
| Protection rating | IP67 |
| Configuration | suitable for series and parallel connection |
| Certifications | UN38.3, CE, UKCA, UL1642 |
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