12V 17Ah GEL Lead-Acid Battery COSI CSB-1217 GEL — 12V 17Ah, GEL, terminal T1 (4.75 mm)

Sealed 12V 17Ah GEL lead-acid battery COSI CSB-1217 GEL provides valve-regulated, maintenance-free energy storage with immobilized electrolyte. Designed for applications that require compact, stable power, this GEL battery delivers a rated capacity of 17Ah at 12V and uses GEL technology to improve tolerance to deeper discharges and cycling life. The battery is equipped with T1 (4.75 mm) terminals for common, reliable connection in small and medium power systems.

Advantages

GEL construction reduces electrolyte stratification and permits safer operation in multiple mounting orientations. The sealed, valve-regulated design eliminates the need for regular topping up, lowering maintenance requirements. GEL formulation increases resistance to deep discharge and improves cycle stability compared with standard flooded lead-acid types. Compact dimensions and standard T1 terminals simplify installation in backup power units, alarm systems, UPS units and portable equipment.

Suitable for

• Uninterruptible power supplies (UPS) for short-term backup
• Alarm and security systems
• Mobility aids and electric scooters with compatible voltage
• Small renewable energy storage and off-grid kits
• Emergency lighting and signage

Key specifications

• Nominal voltage: 12V
• Rated capacity: 17Ah (at standard discharge conditions)
• Electrolyte type: GEL (immobilized electrolyte)
• Terminal type: T1 (4.75 mm)
• Design: Sealed, valve-regulated lead-acid (VRLA)
• Maintenance: Maintenance-free (no topping up)

How to use

Install the battery in a dry, well-ventilated area away from direct heat sources. Ensure polarity is correct and use compatible T1 terminal connectors tightened to manufacturer-recommended torque. For initial commissioning, charge the battery with an appropriate 12V GEL/lead-acid battery charger using the recommended charge profile for GEL batteries. Observe recommended float and cyclic charge voltages to maximize life. Avoid prolonged deep discharges; recharge promptly after use and store the battery at partial charge if not used for extended periods.

Usage recommendations

Use a charger that supports GEL/VRLA chemistry and follow the charger manufacturer’s settings for charge current and voltage. Periodically check voltage and perform a charge cycle during storage every 3–6 months to prevent permanent capacity loss. When replacing an old battery, verify enclosure space and terminal compatibility with the T1 connector to ensure safe, reliable installation.