Date of Award

August 2017

Degree Type


Degree Name

Master of Science



First Advisor

Wilkistar Otieno

Committee Members

Wilkistar Otieno, Naira Campbell-Kyureghyan, Benjamin Church


Agm Batteries, Free-replacement Warranty Policy, Renewal Function, Warranty Policies, Weibull Distribution


The objective of this study is to analyze the suitability of the age-based warranty model and a millage based warranty model for absorbent glass mat batteries (AGM) for the automobile industry. The battery life expectancy can be assessed and described by a combination of different terms such as: state of health (SOH), deep of discharge (DOD), state of energy (SOE) and state of charge (SOC). However, using actual data from the field, the implementation of reliability engineering and statistical modeling we aim to calculate optimal limits for warranty policies that minimize warranty costs. The outcomes of this research will enable battery manufacturers, motor companies and warranty managers in decisions making strategies for cost savings in warranty projects without negatively affecting customer satisfaction.