12V 250Ah Marine Battery

The 12V 250Ah Marine Battery (UPG UB8D) is a true deep-cycle, 12 V AGM battery in the BCI Group 8D form factor, engineered to deliver 250 Ah of reliable, maintenance-free power at the 20 hour rate—perfectly suited for demanding marine and RV applications.

Built with Absorbent Glass Mat (AGM) technology, its valve-regulated, spill-proof construction eliminates the need for watering and vents any recombined gases internally—so you can install it in any orientation without risk of leakage or corrosive fumes The robust AGM design also yields excellent deep-discharge tolerance, supporting repeated cycling down to low state-of-charge with minimal capacity loss over time.

With a low self-discharge rate of under 3 % per month, the UB8D holds its charge during off-season storage or standby use, ensuring it’s ready when you need it. Its one-year replacement warranty further backs the battery’s durable performance in harsh environments—whether you’re trolling, powering cabin loads, running bilge pumps, or operating onboard electronics.

Key Applications

• Marine: trolling motors, navigation lights, livewell pumps

• RV: house batteries for lighting, outlets, and appliances

• Renewable/Off-grid: solar charge storage, emergency backup

• Industrial: telemetry, SCADA, instrumentation

Technical Specifications

• Voltage (DC): 12 V • 20 Hr Rate: 250 Ah • 10 Hr Rate: 233 Ah • 5 Hr Rate: 213 Ah • 1 Hr Rate: 150 Ah

• Dimensions: 20.47″ L × 10.55″ W × 8.66″ H • Weight: ≈ 154 lb (70 kg) • Terminal Type: L4

• Charge Voltages: Standby 13.6–13.8 V • Cycle Service 14.6–14.8 V

• Certifications: DOT, IATA, FAA, CAB approved for air transport

• Construction: Sealed, maintenance-free AGM; leak-proof and vibration-resistant

Whether you’re outfitting a boat for extended cruising or outfitting an RV for off-grid adventures, the UPG UB8D delivers the deep-cycle endurance, safety and reliability you demand on the water or the road.