The Yuasa YUAM720GZ GYZ20L is a maintenance-free AGM (Absorbent Glass Mat) battery that uses lead-calcium alloy grids and sulfuric acid electrolyte suspended in fiberglass separators. Through electrochemical reactions between lead dioxide (PbO₂) and sponge lead (Pb), it generates 12V power while minimizing gas emissions. Its sealed construction enables vibration resistance and leak-proof operation, making it ideal for UPS systems, medical equipment, and telecom infrastructure.
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What Electrochemical Processes Power This Battery?
During discharge, lead dioxide (positive plates) and sponge lead (negative plates) react with sulfuric acid to produce lead sulfate, water, and electrical energy. Charging reverses this reaction through external voltage input. The AGM design immobilizes electrolytes, enabling oxygen recombination cycles that prevent water loss. This dual-phase chemistry achieves 99% recombination efficiency, allowing non-vertical installation positions.
The lead-calcium alloy grid structure significantly reduces gassing compared to traditional lead-antimony designs. This alloy composition minimizes self-discharge to just 2-3% per month at 20°C. During overcharge scenarios, the oxygen recombination process converts 99.9% of generated oxygen back into water through catalytic recombination on the negative plates. This closed-loop system maintains electrolyte concentration within ±0.5% variance across 500 cycles, ensuring stable voltage output between 12.65V-12.85V at full charge.
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Which Applications Benefit Most From Its Design?
- Uninterruptible Power Supplies (UPS): 650-1500VA systems requiring high cyclic stability
- Medical Devices: MRI machines and surgical equipment needing zero-emission safety
- Telecom Base Stations: Vibration-resistant power for remote installations
- Renewable Energy Storage: Solar/Wind systems requiring deep-cycle capabilities
How Does Its AGM Technology Enhance Safety?
The compressed glass mat separators absorb all free electrolyte, eliminating spill risks even during 360° tilting. Pressure-regulated valves control internal gas buildup, while flame-arresting ceramic filters prevent external ignition. Third-party testing confirms compliance with UL 1989 Class 1 Div 2 hazardous location standards, achieving 0.0004% annual gas emission rates.
What Charging Algorithms Maximize Lifespan?
Yuasa recommends 3-stage charging: Bulk (14.4-14.8V at 10-30% C₄₀ current), Absorption (constant voltage for 2-4 hours), and Float (13.5-13.8V maintenance). Pulse desulfation cycles every 45 days recover plate conductivity. Temperature compensation adjusts ±3mV/°C from 25°C reference to prevent thermal runaway.
How Does Cold Weather Impact Performance?
At -40°C, the YUAM720GZ retains 72% of its 20°C capacity versus 58% in flooded batteries. The AGM’s low internal resistance (3.6mΩ) enables 850CCA cold cranking amps. Phase-stabilized separators prevent electrolyte freezing until -68°C, outperforming standard batteries by 22°C.
The battery’s cold weather resilience stems from optimized electrolyte saturation levels (93-95%) in AGM separators. This precise saturation maintains ionic conductivity while preventing ice crystal formation. Below -30°C, the calcium-tin grid alloy maintains structural integrity where traditional alloys become brittle. Field tests demonstrate 98% starting capability at -40°C after 48-hour cold soaking, with voltage drop limited to 9.6V during 30-second cranking cycles.
| Temperature (°C) | Capacity Retention | Cranking Amps |
|---|---|---|
| 20 | 100% | 850A |
| -20 | 88% | 790A |
| -40 | 72% | 625A |
Expert Views
“The YUAM720GZ’s calcium-Sn alloy grid formulation reduces corrosion rates to 0.15mm/year versus 0.8mm in standard lead-antimony designs. Combined with 1.28 specific gravity electrolyte optimization, this enables 12-year float service life – 3x industry averages for telecom applications.”
– Power Systems Engineer, Industrial Battery Consortium
Conclusion
Through advanced AGM engineering and precision chemistry controls, the Yuasa YUAM720GZ delivers reliable power across extreme operational environments. Its maintenance-free operation and 10-year design lifespan make it a critical infrastructure battery solution.
FAQs
- Can it be installed sideways?
- Yes – AGM construction allows any orientation except inverted.
- What’s the recharge time after 50% DoD?
- 7.2 hours at 25°C with proper 3-stage charging.
- How many cycles at 80% discharge?
- 600 cycles to 50% capacity per IEC 60896-21 standards.