12V 300Ah Lithium Battery – Group 8D – VTL12-300

Description

Maximum Capacity in a Group 8D Size – the 12V 300Ah lithium battery is engineered for high demand solar, RV, marine vessels and backup power systems requiring substantial energy storage. With 3840Wh of usable power and integrated Bluetooth monitoring, it delivers dependable, maintenance-free performance for demanding applications where extended runtime is critical.

Compatible With / Replaces

This 12V 300Ah LiFePO₄ battery can replace EWLI12V-300, EWLI12V-300BH, RB300, RBT12300LFP, WPL8D and similar high-capacity lithium batteries.

Key Features

• Integrated BMS – Protects against overcharge, over-discharge, short circuits, and overheating.
• High Capacity & Long Cycle Life – 4,000+ cycles at 50% depth of discharge for extended lifespan.
• Bluetooth Monitoring – Track status, voltage, and health from your smartphone.
• Consistent High Output – Efficient power delivery for large solar arrays, RVs, and marine systems.
• Lightweight Design – Up to 50% lighter than equivalent lead-acid batteries.
• Wide Operating Temperature – Operates safely from -20°C to 60°C (-4°F to 140°F).
• Maintenance-Free – No watering or equalizing required.

Common Applications

• Larger off-grid solar systems
• Full-size RV and camper power
• Marine deep cycle applications
• Backup power for off-grid systems
• Multiple device or appliance setups

Specifications

• Nominal Voltage: 12.8V
• Capacity: 300Ah (3840Wh)
• Chemistry: LiFePO₄ (Lithium Iron Phosphate)
• Group Size: 8D
• Length: 520 mm (19″)
• Width: 269 mm (10.6″)
• Height: 220 mm (8.66″)
• Weight: 32 kg (70.5 lbs)
• Terminal Type: M6 Insert
• Data Sheet: Download VTL12-300 Specifications PDF
• Warranty Info: View warranty coverage (PDF)

Choose the 12V 300Ah Lithium Battery when your system demands serious energy storage. For smaller or mid-sized systems see our 12V 100Ah Lithium Battery or 12V 200Ah Lithium Battery.

Frequently Asked Questions

What is a LiFePO₄ lithium battery?

A LiFePO₄ (Lithium Iron Phosphate) battery is a high-performance lithium battery with excellent energy density, long cycle life, lightweight design, and stable, safe chemistry. Ideal for large solar, RV, marine, and backup systems.

How does this 300Ah battery compare to 100Ah models?

The 12V 300Ah LiFePO₄ battery provides triple the energy storage of standard 100Ah batteries, making it perfect for larger systems where longer runtime and higher power output are required. It’s still lightweight, maintenance-free, and equipped with Bluetooth monitoring.

How does this battery compare to lead-acid batteries?

This high-capacity lithium battery is lighter, charges faster, and maintains higher voltage under load than traditional lead-acid or AGM batteries, while offering up to 4,000 cycles at 50% depth of discharge.

Can I connect multiple batteries together?

You can connect up to four VTL12‑300 batteries in series to create a 48V, 300Ah battery bank, or connect up to four in parallel to create a 12V, 1,200Ah bank. Always use batteries of the same model and state of charge, and make sure connections follow safe wiring practices and the battery’s built-in management system (BMS) limits to protect your batteries.

Do I need a special charger?

Yes. To maximize lifespan and performance, use a lithium-compatible charger or a multi-stage charger that supports LiFePO₄ chemistry. Standard lead-acid chargers are not recommended unless they have a lithium charging mode.