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Copyright 2001 The McGraw-Hill Companies, Inc. Click Here for Terms of Use.
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190 ALL ABOUT BATTERIES AND ROBOT POWER SUPPLIES
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With judicious planning and use, however, combined with some instruction in how to make do with the limitations, these common everyday batteries can provide more than adequate power to all of your robot creations.
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Types of Batteries
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There are seven main types of batteries, which come in a variety of shapes, sizes, and configurations.
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Zinc batteries are the staple of the battery industry and are often referred to simply as flashlight cells. The chemical makeup of zinc batteries takes two forms: carbon zinc and zinc chloride. Carbon zinc, or regular-duty, batteries die out the quickest and are unsuited to robotic applications. Zinc chloride, or heavy-duty, batteries provide a little more power than regular carbon zinc cells and last 25 to 50 percent longer. Despite the added energy, zinc chloride batteries are also unsuitable for most robotics applications. Both carbon zinc and zinc chloride batteries can be rejuvenated a few times after being drained. See the section Battery Recharging later in the chapter for more information on recharging batteries. Zinc batteries are available in all the standard flashlight (D, C, A, AA, and AAA) and lantern battery sizes.
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ALKALINE
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Alkaline cells use a special alkaline manganese dioxide formula that lasts up to 800 percent longer than carbon zinc batteries. The actual increase in life expectancy ranges from about 300 percent to 800 percent, depending on the application. In robotics, where the batteries are driving motors, solenoids, and electronics, the average increase is a reasonable 450 to 550 percent. Alkaline cells, which come in all the standard sizes (as well as 6- and 12-volt lantern cells), cost about twice as much as zinc batteries. But the increase in power and service life is worth the cost. Unlike zinc batteries, however, ordinary alkaline batteries cannot be rejuvenated by recharging without risking fire (though some people try it just the same). During recharging, alkaline batteries generate considerable internal heat, which can cause them to explode or catch fire. So when these batteries are dead, just throw them away. Recently, however, a new rechargeable alkaline cell has reached the market. These provide many of the benefits of ordinary alkaline cells but with the added advantage of being rechargeable. A special low-current recharger is required (don t use the recharger on another battery type or you may damage the recharger or the batteries). While rechargeable alkalines cost more than ordinary alkaline cells, over time your savings from reusing the batteries can be considerable.
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TYPES OF BATTERIES 191
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NICKEL-CADMIUM
When you think rechargeable battery, you undoubtedly think nickel-cadmium or Ni-Cad for short. Ni-Cads aren t the only battery specifically engineered to be recharged, but they are among the least expensive and easiest to get. Ni-Cads are ideal for most all robotics applications. The Ni-Cad cells are available in all standard sizes, plus special-purpose sub sizes for use in sealed battery packs (as in rechargeable handheld vacuum cleaners, photoflash equipment, and so forth). Most sub-size batteries have solder tabs, so you can attach wires directly to the battery instead of placing the cells in a battery holder. Ni-Cads don t last nearly as long as zinc or alkaline batteries, but you can easily recharge them when they wear out. Most battery manufacturers claim their Ni-Cad cells last for 500 or more recharges. A new, higher capacity Ni-Cad battery is available that offers two to three times the service life of regular Ni-Cads. More importantly, these high-capacity cells provide considerably more power and are ideally suited for robotics work. Of course, they cost more. Note that Ni-Cads can suffer from memory effect whereby the useful capacity of the battery is reduced if the cell is not fully discharged before it is recharged. To be fair, newer Ni-Cad batteries don t exhibit this memory effect nearly as much as the older kind (and some Ni-Cad makers insist memory effect is no longer an issue). Read more about memory effect and other problems with Ni-Cad batteries in Ni-Cad Disadvantages, later in this chapter.
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