CSB MU900S 2V 900Ah Telecom VRLA-AGM Battery

Product Features

Valve-regulated lead-acid (VRLA) design
Absorbent glass mat (AGM) technology with up to 99% gas recombination efficiency, maintenance-free
Constructed with pure lead and proprietary elements
Developed for high-capacity float standby power applications
Manufactured in compliance with IEC 60896-21/22:2004, UL1989 certified (MH14533)

Application Scenarios

Telecom base stations requiring ultra-long backup time
DC power systems for large telecom hubs
Long-duration backup power for regional aggregation equipment rooms
Energy storage backup for remote islands and sites
High-capacity backup power for core network equipment rooms
DC backup power for emergency command centers

Product parameters

Model：MU900S
Voltage：2 Vdc
Nominal Capacity：900 Ah @10hr-rate
Ah Capacity：888.00 (8-Hr 1.75 VPC @ 25°C)
Ah Capacity：1032.00 (20-Hr 1.75 VPC @ 25°C)
Ah Capacity：872.00 (8-Hr 1.80 VPC @ 25°C)
Max. Charge Current：270.00 A
Max. Discharge Current：5400 A
Short Circuit Current：10580 A
Internal Resistance：0.36 mΩ
Terminal Type：I3 thread copper alloy terminal to accept M10 bolt
Terminal Torque：249±50 Kgf·cm / 216±43 Lbf·in / 24.4±4.9 N·m
Container Material：Flame-retardant 聚丙烯 (UL 94-V0)
Weight：55.90 / 123.20 kg / lb.
Length (L)：303.0±3.0 / 11.93±0.12 mm / in
Width (W)：172.0±3.0 / 6.77±0.12 mm / in
Depth (D)：497.0±3.0 / 19.57±0.12 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

The CSB MU900S, part of the MU series, is a 2V valve-regulated sealed lead-acid battery that uses absorbent glass mat (AGM) technology, achieving up to 99% gas recombination efficiency and requiring no water replenishment under normal operation. This series evolved from the MSV and MSJ lines and targets higher-capacity float standby requirements, with telecom officially designated as its application. In terms of capacity, the MU900S provides a 10-hour rate nominal capacity of 900Ah at 25°C and 1.80VPC; at 25°C and 1.75VPC, the 8-hour rate is 888.00Ah and the 20-hour rate is 1032.00Ah; at 25°C and 1.80VPC, the 8-hour rate is 872.00Ah. The battery can withstand a maximum charge current of 270.00A, a maximum discharge current of 5400A, and a short-circuit current of 10580A, with an internal resistance of only 0.36 mΩ. For charging settings, the float voltage at 25°C is 2.21 to 2.25 Vdc per cell, and the equalize voltage is 2.35 Vdc per cell. Regarding temperature conditions, the nominal temperature is 25°C, discharge can be performed from -15°C to 50°C, and charging and storage are between -15°C and 40°C. The self-discharge rate is less than 10% after 90 days of storage at 25°C, with a maximum storage period of 6 months; the battery must be fully charged before use. If the storage temperature exceeds 25°C, a supplementary charge should be applied earlier. The MU900S features a pure lead construction with a proprietary formula, and its case is flame-retardant polypropylene meeting UL 94-V0. The terminals are I3 threaded copper alloy terminals that accept M10 bolts, with a terminal torque of 249±50 Kgf·cm, 216±43 Lbf·in, or 24.4±4.9 N·m. Dimensions are 303.0±3.0 mm in length, 172.0±3.0 mm in width, and 497.0±3.0 mm in depth, with a weight of 55.90 kg (123.20 lb). In terms of design life, it can reach 20 years in float standby service at 25°C and exceeds 12 years under Eurobat 20°C conditions, making it an ultra-long-life product. The product is manufactured to IEC 60896-21/22:2004 and is UL1989 recognized under file number MH14533. These characteristics make the MU900S suitable for high-capacity DC power applications requiring long-term float standby, such as telecom.