Two of the more important characteristics of batteries are Energy Density (Wh kg) and Power Density (W kg). Energy Density is a measure of how much energy a battery can hold. The higher the energy density, the longer the runtime will be. Typical applications are cell phones, laptops, and digital cameras. Power Density indicates how much power a battery can deliver on demand. The focus is on power bursts rather than runtime. Batteries assembled from large numbers (typically, 5,000 or more) of small, high energy Li Ion cells mass-manufactured for laptop computers and other electronic applications are now being used in FPBEVs (and PHEVs) fabricated on a small scale. However, such small-cell batteries, although providing early opportunities to demonstrate the technical capabilities of PHEV conversions and modern FPBEVs, have inherently high costs and uncertain calendar and cycle life.
Every year in the United States, billions of batteries are bought, used, and thrown out. In 1998 alone, over 3 billion industrial and household batteries were sold. The demand for batteries can be traced largely to the rapid increase in automobiles, cordless, portable products such as cellular phones, video cameras, laptop computers, and battery-powered tools and toys.
Tamsen Butler was living the busy life of a mother of two, a college student, and a freelance writer when her 15-month-old son could no longer breathe properly. She carried him into the ambulance, clutching my son in one arm while I used my other arm to balance my laptop bag. After a couple of nights in a Nebraska hospital tending to her son and staying up late trying to meet writing deadlines, she had an epiphany My son was in the hospital and I was a fool. Rather than working while her son slept, Butler realized she should have been resting. Rather than clutching my son with only one arm I should have had both arms wrapped around him. When her son recovered, Butler and herfamily began spending less time rushing from here to there and reorganized their lives around their health and their time together. They also gave to charity the many extra toys and clothes they had accumulated.1
The control computer is a personal desktop or laptop computer that communicates directly with the microcomputer on the Brewer instrument via a RS-232 serial link. The control computer allows operation of the Brewer instrument either manually by entering commands from a menu or automatically by entering a sequence of commands that is scheduled as a function of solar zenith angle (SZA) or time of day. Nearly all of the data collected by Brewer instruments is collected during automatic operation. The manual mode is used mainly for setup, special tests, or debugging operations.
Additional dynamism arises from technological progress, which results in particular products being put to different uses over time. For example, five years ago rechargeable Ni-Cd batteries were the solution of choice to power all sorts of portable products, including computers, telephones and power tools. Today, batteries that rely upon chemistries other than nickel - cadmium have come to play an increasingly important role in many sectors, such as laptop computers and camcorders. Thus, distribution channels that were devoted to Ni-Cd batteries some years ago may now carry a relatively smaller quantity of such products or, in some situations, may no longer handle any Ni-Cd battery-containing OEM products at all. At the same time, the remaining OEM and replacement Ni-Cd battery marketplace has attracted additional suppliers.
Download Instructions for Laptop Repair Made Easy
Free versions of Laptop Repair Made Easy can not be found anywhere on the net.