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We have developed long-life valve regulated lead acid (VRLA) batteries for cycle use which are suitable for practical applications. At present, the method of evaluating a battery's cycle life is to repeatedly discharge and charge the battery under the electrical discharge conditions actually demanded. Therefore, considerable time is required to obtain the evaluation results. We tried a new technique...
NTT Facilities, Inc. has developed a valve regulated lead acid (VRLA) battery capacity estimation system. The system is composed of capacity test equipment, capacity evaluation equipment, a data transfer program, a central database and a regression curve generating program. The system can transmit data (on battery capacity and internal resistance) from a battery's location to a central database over...
NTT Facilities, Inc. has developed high-rate discharge stationary VRLA batteries (2 V, 200 Ah and 2 V, 300 Ah) for UPSs and data center backups. The battery capacities are 1.35-6.4 times greater at a discharge current of 1-3 CA compared with a conventional battery due to improved plates and poles. We reduced the masses of the batteries by 26% and the volumes by 47% for heavy-current discharges in...
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