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Storage impact in VRLA batteries life

This work describes a study made in order to verify the real impact of storage in life expectancy of VRLA batteries. For this study 85 cells (2V, VRLA) from 5 different manufactures were acquired in Brazilian market. The batteries acquired were three AGM and two GEL types. These cells were subdivided in nine sets of samples that were submitted to different storage conditions. In the study were evaluated the influences of the storage time without recharging (quarterly, half-year and one-year basis), storage environment temperature (25degC, 35degC and without temperature control), as well as the application of equalization recharges. This paper will present the results of this research with a focus in the remaining and recovered capacities behavior for various condition tests.