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

Product Features

Valve Regulated Lead Acid (VRLA) battery
Maintenance-free with Absorbent Glass Mat (AGM) technology, up to 99% gas recombination efficiency
Pure lead construction with proprietary elements
Designed for high-rate UPS and float charge backup power applications
Manufactured to IEC 61056-1/2:2012 and UL1989 certified (MH14533)

Application Scenarios

Uninterruptible power supply for server racks
UPS backup power for small and medium data centers
Emergency power supply for network equipment rooms
UPS backup power for medical imaging equipment
Fast discharge scenarios for industrial control UPS
Backup power for precision laboratory 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 pure lead battery line, featuring high-rate discharge capability in a 12V valve regulated sealed lead acid format, primarily aimed at small-output UPS and fast-discharge backup scenarios. Nominal capacity is 51W @15min-rate (1.67 VPC @25°C); power per cell is 108.5W at the 5-minute rate and 53.3W at the 15-minute rate. For float backup applications such as data center uninterruptible power supplies, this battery handles high-rate discharge demands. Technically, the battery combines Valve Regulated Lead Acid (VRLA) with Absorbent Glass Mat (AGM), achieving gas recombination efficiency of up to 99% and requiring no maintenance during use. The positive and negative plates are constructed with pure lead, plus a proprietary formula, to support high-rate discharge. The product meets IEC 61056-1/2:2012 standards and holds UL1989 certification (MH14533). The case uses ABS material (UL 94-HB); a flame-retardant version (94-V0) is also available. At 25°C, the HR1251W has a float charge voltage of 13.5-13.8 Vdc per battery and an equalization charge voltage of 14.4-15.0 Vdc per battery. Maximum charge current is 5.10A, maximum discharge current is 180A, short-circuit current is 462A, and internal resistance is 13.6 mΩ. Terminals are F2-Faston Tab250 type. Operating temperature range: discharge -15°C to 50°C, charge/storage -15°C to 40°C, nominal operating temperature 25°C. Dimensions are 151.0±2.0 mm in length, 98.0±1.0 mm in width, and 100.3±1.5 mm in height, with a weight of approximately 3.85 kg. Design life is 5 years under 25°C float charge conditions, and 3-5 years under Eurobat standards (20°C). Self-discharge at 25°C is less than 10% after 90 days; the battery can be stored for up to 6 months but must be fully charged before use. If storage temperature exceeds 25°C, charge it earlier. In applications such as data center UPS that require high-rate discharge and reliable backup power, the HR1251W is suitable. The pure lead design works together with AGM technology to deliver stable performance in float standby applications. During installation, ensure terminals are securely connected and operate within the recommended charge voltage and temperature ranges to fully realize the battery's design characteristics.