A Study on the Cause of Deterioration in Float-charged Lithium-ion Battery

摘要

In today's advanced digitized society, communication lines must be preserved, even in the event that commercial electricity supplies are interrupted, and backup power sources are needed as a means of providing electric power to communication facilities in times of emergency. As backup power sources used by NTT Group, engine generators and batteries are available. Generally, as a long-term backup power source, engine generators are used, and as a short-term backup power source, lead-acid batteries are used.