Unknown I would like to express my thanks to Mrs. Mariana Gerganska for her valuable help with the translation of this book and for her amicable criticism and useful remarks. I also thank Ms. Dina Ivanova for her technical assistance with the graphical illustrations and all my collaborators from the Lead-Acid Batteries Department of IEES for their most generous support. I am grateful to Mr. P. Kirubhagaran and Mr. B. Mageswaran and their team from Elsevier's book publishing division, Chennai, for their excellent work in converting my manuscript into a book. And last, but not the least, I sincerely thank Ms. Anita Koch, Associate Acquisition Editor at Elsevier, for her patience and understanding throughout the time of preparation and submission of my manuscript. I would also like to express my sincere gratitude to the following organizations for their kindness to grant me permissions to reproduce copyright materials:•Elsevier B.V.•The Electrochemical Society, Inc.•Springer Science and Business Media B.V.•John Wiley & Sons, Ltd.While every effort has been made to contact copyright holders or their agents, a few have remained untraceable. I would be interested to hear from any copyright holders who have not been acknowledged. I would be grateful if notified of any corrections that should be incorporated in future reprints or editions of this book. Elsevier B.V. The Electrochemical Society, Inc. Springer Science and Business Media B.V. John Wiley & Sons, Ltd.