CSB HR Series HR1251W 12V 51W Valve-Regulated Sealed Lead-Acid Battery

Product Features

VRLA (valve-regulated lead-acid) battery
AGM technology, maintenance-free, gas recombination efficiency up to 99%
Pure lead construction with proprietary formulation elements
Designed for high-rate UPS and float standby power applications
Manufactured in accordance with IEC 61056-1/2:2012 and UL1989 certified (MH14533)

Application Scenarios

UPS backup power: suitable for small and medium data centers
Uninterruptible power supply systems: power for server racks
Emergency power assurance: for network equipment rooms
Standby power: UPS for medical imaging equipment
Fast-discharge UPS: industrial control applications
Backup power solutions: laboratory precision instruments

Product parameters

Model：HR1251W
Voltage：12 Vdc
Nominal Capacity：51W @15min-rate
Watts per Cell：108.5 (5-Min 1.67 VPC @ 25°)
Watts per Cell：53.3 (15-Min 1.67 VPC @ 25°)
Max. Charge Current：5.10 A
Max. Discharge Current：180 A
Short Circuit Current：462 A
Internal Resistance：13.6 mΩ
Terminal Type：F2 terminal (Faston Tab 250)
Container Material：ABS (UL 94-HB) standard, flame-retardant (94-V0) available upon request
Weight：3.85 / 8.49 kg / lb.
Length (L)：151.0±2.0 / 5.94±0.08 mm / in
Width (W)：98.0±1.0 / 3.86±0.04 mm / in
Height (H)：100.3±1.5 / 3.95±0.06 mm / in
Design Life：Up to 5 years in standby service at 25°C; Eurobat (20°C): 3-5 years, Standard Commercial
Float Charging Voltage：13.5 - 13.8 Vdc/battery
Equalizing Charging Voltage：14.4 - 15.0 Vdc/battery
Operating Temperature：discharge -15°C to 50°C; charge/storage -15°C to 40°C

Product details

The CSB HR1251W belongs to the HR Series high-rate discharge pure lead batteries. It is a 12V valve-regulated sealed lead-acid battery developed for fast-discharge standby and small-output UPS applications. Its nominal capacity is 51W @15min-rate (1.67 VPC @25°C), with 108.5W per cell at the 5-minute rate and 53.3W per cell at the 15-minute rate, making it suitable for float standby applications requiring high-rate discharge, such as data center uninterruptible power supplies. The battery is constructed with valve-regulated sealed lead-acid (VRLA) and absorptive glass mat (AGM) technology, achieving gas recombination efficiency of up to 99% and requiring no maintenance during use. The positive and negative plates use pure lead construction and a proprietary formula to support high-rate discharge. The product meets IEC 61056-1/2:2012 standards and is UL1989 certified (MH14533). The case material is ABS (UL 94-HB); a flame-retardant version (94-V0) is available upon request. At 25°C, the HR1251W has a float charge voltage of 13.5-13.8 Vdc/cell and an equalization charge voltage of 14.4-15.0 Vdc/cell. The maximum charge current is 5.10A, the maximum discharge current is 180A, the short-circuit current is 462A, and the internal resistance is 13.6 mΩ. The terminal type is F2-Faston Tab250. Operating temperature ranges: discharge from -15°C to 50°C, charge/storage from -15°C to 40°C, with a nominal operating temperature of 25°C. Dimensions are length 151.0±2.0 mm, width 98.0±1.0 mm, height 100.3±1.5 mm, and weight approximately 3.85 kg. Design life is up to 5 years in float service at 25°C, and 3-5 years per Eurobat standard (20°C). Self-discharge at 25°C is less than 10% after 90 days; the battery can be stored for up to 6 months and must be fully charged before use. If storage temperature exceeds 25°C, recharge is required earlier. For scenarios such as data center UPS that require both high-rate discharge and reliable backup power, the HR1251W is a suitable choice. Its pure lead design and AGM technology help maintain stable performance in float standby applications. During installation, ensure secure terminal connections and operate within the recommended charge voltage and temperature ranges to fully realize the battery's design characteristics.