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Ni-MH batteries were the next generation of mobile PC batteries and are still quite common today Basically, Ni-MH batteries are Ni-Cd batteries without most of the headaches Ni-MH batteries are much less susceptible to memory problems, can better tolerate overcharging, can take more recharging, and last longer between rechargings Like Ni-Cds, Ni-MH batteries are still susceptible to heat, but at least they are considered less toxic to the environment It s still a good idea to do a special disposal Unlike a Ni-Cd, it s usually better to recharge a Ni-MH with shallow recharges as opposed to a complete discharge/ recharge Ni-MH is a popular replacement battery for Ni-Cd systems (Figure 1626)
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The most common type battery used today is Li-Ion Li-Ion batteries are very powerful, completely immune to memory problems, and last at least twice as long as comparable Ni-MH batteries on one charge Sadly, they can t handle as many charges as Ni-MH types, but today s users are usually more than glad to give up total battery lifespan in return for longer periods between charges Li-Ion batteries will explode if they are overcharged, so all Li-Ion batteries sold with PCs have built-in circuitry to prevent accidental overcharging Lithium batteries can only be used on systems designed to use them They can t be used as replacement batteries (Figure 1627)
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In an attempt to provide better maintenance for laptop batteries, manufacturers have developed a new type of battery called the smart battery Smart batteries tell the computer when they need to be charged, conditioned, or replaced Portable computer manufacturers are also looking at other potential power sources, especially ones that don t have the shortcomings of current batteries The most promising of these new technologies is fuel cells The technology behind fuel cells is very complex, but to summarize, fuel cells produce electrical power as a result of a chemical reaction between the hydrogen
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16: Portable Computing
and oxygen contained in the fuel cell It is estimated that a small fuel cell could power a laptop for up to 40 hours before it needs to be replaced or refilled This technology is still a year or two from making it to the consumer market, but it s an exciting trend!
Try This!
Recycling Old Portable PC Batteries
Got an old portable PC battery lying around Well, you ve got to get rid of it, and since there are some pretty nasty chemicals in that battery, you can t just throw it in the trash Sooner or later, you ll probably need to deal with such a battery, so try this: 1 2 Do an online search to find the battery recycling center nearest to you Sometimes, you can take old laptop batteries to an auto parts store that disposes of old car batteries I know it sounds odd, but it s true! See if you can find one in your area that will do this Many cities offer a hazardous materials disposal or recycling service Check to see if and how your local government will help you dispose of your old batteries
The Care and Feeding of Batteries
In general, keep in mind the following basics First, always store batteries in a cool place Although a freezer is in concept an excellent storage place, the moisture, metal racks, and food make it a bad idea Second, condition your Ni-Cd and Ni-MH batteries by using a charger that also conditions the battery; they ll last longer Third, keep battery contacts clean with a little alcohol or just a dry cloth Fourth, never handle a battery that has ruptured or broken; battery chemicals are very dangerous Finally, always recycle old batteries
Power Management
Many different parts are included in the typical laptop, and each part uses power The problem with early laptops was that every one of these parts used power continuously, whether or not the system needed that device at that time For example, the hard drive would continue to spin whether or not it was being accessed, and the LCD panel would continue to display, even when the user walked away from the machine The optimal situation would be a system where the user could instruct the PC to shut down unused devices selectively, preferably by defining a maximum period of inactivity that, when reached, would trigger the PC to shut down the inactive device Longer periods of inactivity would eventually enable the entire system to shut itself down, leaving critical information loaded in RAM, ready to restart if a wake-up event (such as moving the mouse or pressing a key) would tell the system to restart The system would have to be sensitive to potential hazards, such as shutting down in the middle of writing to a drive, and so on Also, this feature could not add significantly to the cost of the PC Clearly, a machine that could perform these functions would need specialized hardware, BIOS, and operating system to operate properly This process of cooperation among the hardware, the BIOS, and the OS to reduce power use is known generically as power management
System Management Mode (SMM)
Intel began the process of power management with a series of new features built into the 386SX CPU These new features enabled the CPU to slow down or 516
Mike Meyers CompTIA A+ Guide: Essentials (Exam 220-601)
stop its clock without erasing the register information, as well as enabling power saving in peripherals These features were collectively called System Management Mode (SMM) All modern CPUs have SMM Although a power-saving CPU was okay, power management was relegated to special sleep or doze buttons that would stop the CPU and all of the peripherals on the laptop To take real advantage of SMM, the system needed a specialized BIOS and OS to go with the SMM CPU To this end, Intel put forward the Advanced Power Management (APM) specification in 1992 and the Advanced Configuration and Power Interface (ACPI) standard in 1996
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