6V 330Ah AGM Deep Cycle Battery

Description

The Valiant VTD6-330 is a 6V 330Ah AGM deep cycle battery designed for off-grid solar systems, floor cleaning equipment, marine and RV house power, and other demanding battery-powered applications. Its BCI Group 902 / J305-size case provides high-capacity energy storage in a sealed design that requires no watering.

Built with thick plates and advanced AGM separators, the VTD6-330 offers up to 1,200 cycles at 50% depth of discharge and a float design life of up to 15 years under suitable operating conditions.

Compatible With / Replaces

The VTD6-330 may be suitable as a replacement for the following 6V AGM batteries in the J305 / Group 902 size family:

• Magnavolt SLA6-350-J305
• Trojan J305-AGM
• Trojan J305-AES
• U.S. Battery US AGM 305

Confirm dimensions, terminal type and position, cable connections, charging requirements and equipment compatibility before ordering. 

Key Features

• 330Ah Deep Cycle Capacity – Rated at the 20-hour rate for high-capacity energy storage.
• High Cycle Life – Up to 1,200 cycles at 50% depth of discharge under specified operating conditions.
• Maintenance-Free AGM Design – Requires no watering or electrolyte top-ups.
• Durable Plate Construction – Thick plates and advanced separators support repeated cycling and deep discharge recovery.
• M8 Insert Terminals – Threaded connections for compatible battery cables.
• Long Float Design Life – Up to 15 years in standby/float service. Actual life depends on temperature, charging and usage.

Common Applications

• Off-grid solar energy storage systems
• Floor scrubbers and floor cleaning equipment
• Marine and RV house battery banks
• Compatible electric vehicles and commercial equipment
• Backup power and standby systems

Specifications

• Voltage: 6V
• Capacity: 330Ah
• Chemistry: AGM (Absorbent Glass Mat)
• BCI Group Size: 902 / J305-size case
• Terminal Type: M8 Insert
• Length: 11.61″ / 295 mm
• Width: 7.01″ / 178 mm
• Height: 13.94″ / 354 mm
• Height with Terminal: 14.17″ / 360 mm
• Weight: 102.73 lbs / 46.6 kg
• Data Sheet: VTD6-330 Data Sheet (PDF)
• Warranty: Valiant VTD Warranty (PDF)

Need help confirming compatibility? Contact us with your existing battery model and equipment details, and we’ll help identify a suitable replacement.

Frequently Asked Questions

Is this battery maintenance-free?

Yes. Its AGM design requires no watering or electrolyte top-ups. Keep the battery properly charged and inspect connections regularly.

Can it replace a J305 AGM battery?

It may be suitable for equipment using 6V AGM batteries in the J305 / Group 902 size family. Confirm the available space, terminal connections and charger compatibility before ordering.

Can I use two batteries for a 12V system?

Yes. Two matching 6V 330Ah batteries connected in series form a 12V 330Ah battery bank. Use batteries of the same model, age and condition, with a suitable AGM charger.

Does the 15-year float life apply to daily cycling?

No. Float design life refers to standby service under suitable conditions. For regularly cycled applications, battery life depends on depth of discharge, charging, temperature and frequency of use.