CSB MSJ-500 2V 500Ah VRLA-AGM Battery for Telecom Float Standby Power

Product Features

Valve-regulated lead-acid (VRLA) battery design
Maintenance-free, no water addition required, utilizing absorbed glass mat (AGM) technology with gas recombination efficiency up to 99%
Plates made of pure lead with proprietary formulation elements
Developed for high-capacity float standby power requirements
Manufactured in compliance with IEC 60896-21/22:2004 and certified to UL1989 (MH14533)

Application Scenarios

Standby power for DC supply in communication base stations
Standby power for optical access network central office equipment
DC power supply for microwave relay stations
48V DC power architecture in telecom equipment rooms
Standby power source for broadband access equipment
Standby power for mobile communication core networks

Product parameters

Model：MSJ-500
Voltage：2 Vdc
Nominal Capacity：500 Ah @10hr-rate
Ah Capacity：506.40 (8-Hr 1.75 VPC @ 25°C)
Ah Capacity：524.00 (20-Hr 1.75 VPC @ 25°C)
Ah Capacity：493.60 (8-Hr 1.80 VPC @ 25°C)
Max. Charge Current：150.00 A
Max. Discharge Current：3000 A
Short Circuit Current：9953 A
Internal Resistance：0.28 mΩ
Terminal Type：I4 thread copper alloy terminal to accept M8 bolt
Terminal Torque：126±25 Kgf·cm / 109±22 Lbf·in / 12.3±2.5 N·m
Container Material：Flame-retardant ABS (UL 94-V0)
Weight：36.50 / 80.45 kg / lb.
Width (W)：171.0±2.0 / 6.73±0.08 mm / in
Height (H)：339.0±2.5 / 13.15±0.10 mm / in
Depth (D)：241.0±2.5 / 9.49±0.10 mm / in
Design Life：Up to 20 years in standby service at 25°C; Eurobat (20°C): >12 years, Very Long Life
Float Charging Voltage：2.21 ~ 2.25 Vdc/battery
Equalizing Charging Voltage：2.35 Vdc/battery
Operating Temperature：discharge -15°C to 50°C; charge/storage -15°C to 40°C

Product details

As a member of the MSJ series, the CSB MSJ-500 is a 2V VRLA-AGM valve-regulated sealed lead-acid battery, officially designated for telecom applications. This series focuses on VRLA 2V high capacity and extended service life, with a design life of up to 20 years in standby float service. The battery combines valve-regulated sealed lead-acid construction with absorbed glass mat AGM technology, achieves 99% gas recombination efficiency, is maintenance-free, and uses pure lead construction with proprietary elements. In terms of capacity, the MSJ-500 has a nominal capacity of 500Ah, tested at 1.80VPC, 25°C, 10-hour rate. Other capacity data are as follows: at 1.75VPC, 25°C, the 8-hour rate is 506.40Ah and the 20-hour rate is 524.00Ah; at 1.80VPC, 25°C, the 8-hour rate is 493.60Ah. The battery's maximum charge current is 150.00A, maximum discharge current is 3000A, short-circuit current reaches 9953A, and internal resistance is 0.28mΩ. Electrical and temperature parameters: at 25°C, float voltage is between 2.21 and 2.25Vdc/battery, and equalize voltage is 2.35Vdc/battery (25°C). The nominal operating temperature is 25°C, the discharge temperature range is -15°C to 50°C, and the charge and storage temperature range is -15°C to 40°C. For self-discharge, storage at 25°C for 90 days is less than 10%, and the battery can be stored for 6 months; it must be fully charged before use, and if storage temperature exceeds 25°C, charging is required earlier. In terms of construction, the MSJ-500 features I4 threaded copper alloy terminals that accept M8 bolts, with terminal torque of 126±25 Kgf·cm, 109±22 Lbf·in, or 12.3±2.5 N·m. The case material is flame-retardant ABS compliant with UL 94-V0. Weight is 36.50kg (80.45 lb), width is 171.0±2.0mm, height is 339.0±2.5mm, and depth is 241.0±2.5mm. The product is manufactured according to IEC 60896-21/22:2004 and is UL1989 recognized (MH14533). The MSJ-500 is suitable for high-capacity float standby power scenarios in the telecom field. In 25°C standby float service, the design life can reach 20 years; according to the Eurobat standard, it is greater than 12 years at 20°C, placing it in the Very Long Life category. Maintenance-free AGM technology and valve-regulated sealed construction reduce maintenance requirements in float standby applications, making it suitable for communication facilities that require long-term reliable backup power.