Batteries receive much media attention but they lag behind other technologies. These limitations become apparent when advancing the battery from portable uses to wheeled mobility that demands strenuous conformities and long service under harsh conditions. Incremental improvements are being made and the fourth edition Batteries in a Portable World elaborates on these developments. This bestseller handbook on batteries provides a basic understanding of their strength and limitations. If helps the busy professional who needs a crash course on batteries; the engineer who searches for a battery to launch a new product; the student who seeks answers for an academic project; and the everyday battery user who wants to get the most out of each battery. The book is easy to read and makes minimal use of technical jargons. The focus is on practical applications and steps towards perfection.