The BR Solar Gel Battery is a pure gel, valve-regulated lead-acid (VRLA GEL) battery specifically engineered for extreme environments, long-duration backup power, and frequent deep-cycle discharge applications. Compared with standard gel battery series, the BR2-350 delivers exceptional deep-discharge recovery performance and offers up to twice the cycle life, making it ideal for critical power systems.

Designed for professional energy storage solutions, this battery is widely used in solar and wind power systems, marine power supply, deep-cycle UPS systems, and industrial backup applications, where reliability, durability, and long service life are essential.

Key Electrical Specifications

Capacity & Voltage

• Rated Voltage: 2V per cell

• Rated Capacity: 350Ah
  (10-hour rate to 1.80V/cell @ 25℃)

Reference Capacity at Different Discharge Rates

• C3: 273.0Ah

• C5: 303.0Ah

• C10: 350.0Ah

• C20: 372.0Ah

These values provide accurate references for system designers under varying load conditions.

Charge & Discharge Characteristics

• Maximum Discharge Current: 1750A (5 seconds)

• Maximum Charging Current: 70.0A

Charging Voltage (25℃)

• Float Charge Voltage: 2.27 – 2.30V

  • Temperature Compensation: -3 mV/℃/cell

• Cycle Charge Voltage: 2.37 – 2.40V

  • Temperature Compensation: -4 mV/℃/cell

This intelligent voltage compensation ensures optimal charging performance across different ambient temperatures.

Service Life & Durability

• Designed Float Service Life: 20 years

• Self-Discharge Rate: < 2% per month @ 20℃

• Storage Recommendation: Recharge required after 6 months of storage

The ultra-low self-discharge rate ensures long-term storage stability and readiness.

Structural & Physical Characteristics

Dimensions & Weight

• Length: 196 ± 2 mm

• Width: 171 ± 2 mm

• Height: 330 ± 2 mm

• Total Height: 342 ± 2 mm

• Weight: ~20.3 kg (±3%)

Terminals & Materials

• Terminal Type: F10 (M8 threaded)

• Terminal Torque: 10 – 12 N·m

• Container Material: ABS plastic, compliant with UL94-HB / V0 flame-retardant standards

Environmental Adaptability

Operating Temperature Range

• Discharge: -40℃ to 60℃

• Charge: -20℃ to 50℃

• Storage: -40℃ to 60℃

• Optimal Operating Temperature: 25℃ ± 5℃

This wide temperature tolerance makes the BR2-350 suitable for harsh outdoor and industrial environments.

Performance Characteristics & Curve Analysis

The technical documentation provides comprehensive performance curves, including:

• Constant Current Discharge Characteristics:
  Discharge current values from 15 minutes to 20 hours at terminal voltages from 1.60V to 1.85V.

• Constant Power Discharge Characteristics:
  Output power performance under different terminal voltages.

• Cycle Life vs Depth of Discharge (DOD):
  Clearly demonstrates reduced cycle count with increased DOD.

• Temperature Influence on Performance:

  • Charging voltage compensation vs temperature

  • Capacity variation at low temperatures

• Storage Characteristics & Long-Term Life:
  Effects of self-discharge and elevated temperature on battery aging.

• Open Circuit Voltage vs State of Charge (SOC):
  Enables accurate estimation of remaining battery capacity.

Testing & Usage Guidelines

• Capacity Acceptance Criteria:

  • ≥95% of rated capacity after first cycle

  • 100% of rated capacity after the third cycle

• Recommended Charging Mode:
  IU charging profile (constant current followed by constant voltage) for cyclic applications.

Certifications & Quality Control

• Management System:
  Compliant with OHSAS 18001 Occupational Health & Safety Management System

Important Notes

• All technical data are average values obtained from three charge/discharge cycles and are not guaranteed minimum values.

• Battery design and specifications are subject to change without prior notice.

Summary

The BR Solar Gel Battery is a high-reliability, long-life energy storage solution designed for demanding applications requiring deep cycling, high discharge capability, and extreme environmental tolerance. With a 20-year float design life, robust construction, and comprehensive performance data support, it is an excellent choice for renewable energy storage, marine systems, and industrial-grade UPS installations.