RB36V40 36V 40Ah Deep Cycle Lithium Battery - Group 31

Fish longer. Charge faster. Install easier. The RB36V40, LiFePO4 Legacy Lithium Battery 36V, Not Series Capable, 38.4V, 40 Amp Hour delivers powerful and reliable marine-grade performance for serious anglers and boaters. Specifically engineered for 36V trolling motors, this lithium iron phosphate (LiFePO4) battery simplifies your setup while extending run time and reducing weight—giving you more time on the water without compromising speed or space.

KEY FEATURES

• Parallel Design, Simplified Setup
  Eliminate the complexity of series wiring—get maximum voltage from a single 36V unit. The compact design and improved connectors make installation quick and straightforward.
• More Power, Longer Runtime
  Enjoy up to 20% more capacity than comparable series-wired setups. With 40Ah of usable energy, you’ll fish, cruise, or explore longer on every charge.
• Lightweight & Efficient
  At ~70% lighter than traditional lead-acid batteries, the RB36V40 improves boat handling and performance while significantly lowering overall system weight.
• Marine-Ready Durability
  Designed for harsh environments, the IP67 waterproof-rated enclosure features a reinforced glue channel and screw-latch for added protection against moisture, dirt, and airborne contaminants.
• Zero Maintenance & Fast Charging
  Forget about acid top-offs or corrosion. The RB36V40 is completely maintenance-free and supports faster charging, saving you time and money long-term.

Specifications

Electrical Specifications

• Nominal voltage: 38.4V

• Capacity: 40Ah

• Energy: 1536Wh

• Chemistry: Lithium Iron Phosphate (LiFePO4)

• Cycle life: 3500+ cycles at 80% depth of discharge

• Self-discharge: <3% per month

Discharge Specifications

• Max continuous discharge: 50A

• Peak discharge: 100A (7.5 ± 2.5 s)

Charge Specifications

• Recommended charge voltage: 43.2V – 43.8V

• Max charge current: 50A

Temperature Specifications

• Discharge temperature: -4°F to 140°F (-20°C to 60°C)

• Charge temperature: 32°F to 113°F (0°C to 45°C)

Mechanical Specifications

• Weight: 41.9 lbs (19 kg)

• Dimensions: Group 31 standard size (L x W x H)

• Terminal type: M8 bolt

• Waterproof rating: IP67

Certifications

• CE, UKCA

• UN38.3 (battery)

• UL1642 (cells)

• IEC62133 (cells)

Manuals and Downloads

• Datasheet
• Warranty