The OPT8052-161 Optima Group 31M AGM battery is a high-performance, spiral-wound absorbed glass mat (AGM) battery designed for demanding deep-cycle and starting applications. Operating at 12V with 75Ah capacity and 900 cold cranking amps (CCA), it features dual terminals (top-post and threaded) for versatile installations. Its rugged, vibration-resistant design and sealed construction make it ideal for marine vessels, emergency vehicles, and off-grid systems requiring reliable power in extreme conditions.
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What distinguishes the Group 31M’s spiral-wound technology?
Optima’s spiral-wound cell design replaces traditional flat plates with coiled pure lead grids, achieving 15x greater vibration resistance and 2x faster recharge capability. This patented architecture prevents acid stratification and minimizes internal resistance, enabling stable 1,000+ deep cycles at 80% depth of discharge. Pro Tip: Pair with a smart charger maintaining 13.8–14.7V to prevent sulfation.
Unlike conventional AGM batteries, the Group 31M’s cylindrical cells pack 15% more plate surface area within the same footprint, boosting energy density. For example, its 900 CCA outperforms standard Group 31 batteries by 15–20% in sub-zero temperatures. The pressurized AGM design also allows leak-proof operation at angles up to 45°, critical for marine use. However, what happens if over-discharged below 10.5V? Unlike flooded batteries, Optima’s AGM chemistry suffers irreversible capacity loss, necessitating voltage monitoring systems.
How does its deep-cycle capability compare to marine batteries?
The OPT8052-161 excels in high-cycle applications, supporting 400+ discharges to 80% depth versus 250 cycles in standard marine AGM batteries. Its calcium-alloy grids reduce gassing, while the recombinant design recovers 99% of electrolyte. Pro Tip: Cycle between 12.8V (full) and 12.0V (50% SOC) for maximum lifespan.
| Parameter | Optima 31M | Standard Marine AGM |
|---|---|---|
| Cycle Life (80% DoD) | 400 cycles | 250 cycles |
| Recharge Efficiency | 95% | 85–90% |
| Vibration Resistance | 15x baseline | 3x baseline |
Practically speaking, a fishing boat using this battery can run a 50W trolling motor for 14+ hours (75Ah ÷ 3.5A draw) versus 9 hours with conventional batteries. But why the endurance? The spiral cells’ low internal resistance (5mΩ) reduces voltage sag under load, maintaining consistent output.
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What maintenance ensures optimal performance?
Requiring zero electrolyte maintenance, the OPT8052-161 still benefits from quarterly terminal cleaning and monthly voltage checks. Store at 12.6–12.8V when idle, using maintenance chargers if unused >30 days. Pro Tip: Avoid surface charging—AGM batteries need absorption-phase voltage (14.4–14.7V) periodically to prevent stratification.
Beyond basic care, balance charging every 6 months equalizes cell voltages within 0.02V tolerance. For fleets, implementing passive balancing systems extends pack life by 20–30%. Real-world example: A coastal rescue unit reported 5-year service life by maintaining 50% SOC during standby and using temperature-compensated charging.
Redway Battery Expert Insight
FAQs
Yes, but confirm charging profiles—AGM requires lower float voltages (13.2–13.4V vs. 13.6V for FLA) to prevent overcharging.
Is the 900 CCA rating sufficient for diesel engines?
For diesels under 6L displacement, yes. Larger engines need parallel configurations—ensure BMS supports current sharing.
