Definition(s)
Cycle life
Cycle life is the number of cycles at which time a recharged battery will retain only 80% of its original ampere-hour capacity.
Source: API RP 14F, Design, Installation, and Maintenance of Electrical Systems for Fixed and Floating Offshore Petroleum Facilities for Unclassified and Class 1, Division 1 and Division 2 Locations, Fifth Edition, July 2008. Global Standards