Description
The PK40-12 (12V 40Ah) is a professional-grade Sealed Lead-Acid (SLA) battery utilizing AGM (Absorbent Glass Mat) technology. This model is commonly used for high-reliability standby power and industrial applications.
Technical Specifications
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Nominal Voltage: 12V
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Nominal Capacity: 40Ah (at the 20-hour rate)
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Technology: VRLA / AGM (Maintenance-free, spill-proof)
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Dimensions: Approximately 197mm (L) x 165mm (W) x 170mm (H) (Height may vary slightly by terminal type).
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Weight: Approximately 12.5kg – 13kg.
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Terminal Type: Typically M6 bolt-down terminals or T11/T12 types.
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Design Life: Generally 10 years in standby (float) service at 25°C.
Key Features
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Maintenance-Free: The sealed VRLA design eliminates the need to add water.
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High Discharge Performance: Engineered for rapid power delivery, making it excellent for UPS systems.
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Versatile Mounting: Can be installed in various orientations (upright or on its side) due to the immobilized electrolyte.
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Rugged Construction: Built to withstand vibration and shocks, ensuring reliability in stationary or transportable equipment.
Typical Applications
This battery is significantly more powerful than standard “small” batteries and is intended for:
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UPS Systems: Reliable backup for medium-to-large home/office workstations, servers, and telecommunications equipment.
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Solar & Renewable Energy: Used in small-scale off-grid power banks for lighting and electronic control systems.
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Medical Equipment: Powering portable diagnostic carts, mobility scooters, and specialized medical hardware.
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Emergency Infrastructure: Backup power for fire alarm systems, security control panels, and large-scale emergency lighting.
Critical Maintenance & Usage Tips
Note: Because this battery holds a significant amount of energy, it is important to ensure your charging system is compatible to prevent overheating.
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Charging Requirements: Use a charger specifically rated for AGM/SLA batteries.
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Standby (Float) Voltage: 13.5V – 13.8V.
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Cycle Use Voltage: 14.4V – 15.0V (limit initial current to ~12A).
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Avoid Deep Discharge: Never discharge the battery below 10.5V. Frequent deep cycles will significantly shorten its lifespan.
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Storage: If the battery must be stored, ensure it is fully charged and stored in a cool, dry place. Perform a “freshening charge” every 3–6 months to prevent the lead plates from sulfating.
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Terminal Care: Since this model uses bolt-on terminals (M6), ensure the connections are clean and tightly secured. Loose connections create resistance, which leads to heating and potential damage to the battery casing.

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