RB300 LiFePO4 Battery Gr 8D 12V 300Ah 0.3C

RELiON RB300 LiFePO4 Battery 12V 300Ah Group 8D — Large-Format Lithium Power for Marine, Solar & Commercial Applications

The RELiON RB300 is a Group 8D 12V 300Ah (3,840Wh) LiFePO4 (lithium iron phosphate) battery engineered for large-format energy storage applications requiring maximum capacity in a standard 8D footprint. At 3,840Wh of usable energy and a 0.3C continuous discharge rate, it is purpose-built for high-capacity marine house banks, large off-grid solar systems, commercial vehicle auxiliary power, and industrial standby applications where a direct 8D drop-in lithium upgrade is required.

Compared to an equivalent Group 8D AGM battery, the RB300 delivers significantly more usable energy (100% DoD vs. ~50% for AGM), longer cycle life (2000+ cycles vs. 300–500 for AGM), and dramatically less weight per usable kWh. Backed by an industry-leading 36-month full warranty with 10-year prorated coverage from RELiON.

Key Features

• 12V / 300Ah / 3,840Wh — maximum capacity Group 8D lithium cell for large-format energy storage
• Group 8D form factor — direct drop-in lithium replacement for standard 8D battery positions
• LiFePO4 chemistry — safest lithium chemistry; no thermal runaway risk; 2000+ cycle life
• 0.3C continuous discharge rate — 90A continuous discharge for sustained high-draw applications
• 100% usable depth of discharge (DoD) — full 300Ah available vs. ~150Ah usable from equivalent AGM
• Integrated BMS — protects against overcharge, over-discharge, short circuit, and temperature extremes
• Absorption voltage: 14.2–14.6V / Float voltage: 13.5V — for proper charging system configuration
• 36-month full warranty / 10-year prorated — industry-leading coverage from RELiON

Specifications

• Voltage: 12V (nominal)
• Capacity: 300Ah
• Energy: 3,840Wh
• Discharge Rate: 0.3C (90A continuous)
• Chemistry: LiFePO4 (Lithium Iron Phosphate)
• Group Size: 8D
• Absorption Voltage: 14.2–14.6V
• Float Voltage: 13.5V
• Dimensions: 20.6" x 10.5" x 8.7" (522 x 267 x 220 mm)
• Weight: 34.36 kg
• Colour: Blue
• Part/Model Number: RB300
• Brand: RELiON
• Warranty: 36 months full / 10 years prorated

Ideal For

• Large marine house battery banks and liveaboard vessels
• Off-grid and solar energy storage systems requiring high capacity
• Commercial vehicle and truck auxiliary power units (APUs)
• RV and motorhome large house battery banks
• Industrial and telecom standby power applications

Ships from Thunder Battery — Canada's trusted energy storage dealer.