Newstar 12V 28Ah Sealed Lead Acid UPS Battery (AGM VRLA) 33-2812

The Newstar 12V 28Ah is a high-capacity sealed lead acid (VRLA) battery designed for UPS backup and standby power applications. Using AGM (Absorbent Glass Mat) technology, this battery delivers stable output, low internal resistance, and maintenance-free operation. With a robust construction and long float service life, it is well-suited for larger UPS systems, backup power installations, and critical infrastructure requiring dependable standby performance

Technical Specifications

• Brand: Newstar

• Model: 33-2812 / NP12-28Ah

• Battery Type: Sealed Lead Acid (VRLA)

• Technology: AGM

• Nominal Voltage: 12V

• Rated Capacity:

  • 28Ah (20-hour rate, 10.5V)

  • 26Ah (10-hour rate)

  • 17Ah (1-hour rate, 9.60V)

• Internal Resistance: Approx. 10mΩ (fully charged @ 25°C)

• Maximum Charging Current: 8.4A

• Maximum Discharge Current: 360A (5 seconds)

• Designed Floating Life: 5 years (at 20–25°C).

Physical Dimensions

• Length: 166 ±2 mm

• Width: 175 ±2 mm

• Height: 125 ±2 mm

• Total Height: 125 ±2 mm

• Approx. Weight: 8.8 kg ±4%

• Terminal Type: T4 / T12 (M5 bolt & nut)

Charging Information

• Float Charging Voltage (25°C): 13.50 – 13.80V

  • Temperature compensation: −18 mV/°C

• Cyclic Charging Voltage (25°C): 14.50 – 15.00V

  • Temperature compensation: −30 mV/°C

Operating Conditions

• Discharge Temperature Range: −15°C to 50°C

• Charge Temperature Range: −10°C to 50°C

• Storage Temperature Range: −20°C to 50°C

• Capacity Retention (20HR):

  • 40°C: 102%

  • 25°C: 100%

  • 0°C: 85%

  • −15°C: 65%

• Self-Discharge at 25°C:

  • 3 months: 91%

  • 6 months: 82%

  • 12 months: 65%

Warranty & Usage Disclaimer

Warranty:
This battery is supplied with a 1-year warranty only when used for UPS backup applications under normal operating conditions.

Important Usage Notice:
This battery is STRICTLY for UPS backup use.
Use in cars, generators, wheelchairs, golf carts, e-bikes, solar systems, or for engine starting will void the warranty. No warranty claims will be accepted for non-UPS usage.

Applications

✅ Suitable For

• UPS systems (primary application)

• Backup power systems

• IT & network equipment backup

• Emergency power installations

❌ NOT Suitable For

• Cars or automotive starting

• Generators or engine starting

• Wheelchairs or mobility devices

• Golf carts

• Electric bikes (e-bikes)

• Solar or deep-cycle applications