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  • From: keith bellinger <bartermn AT epix.net>
  • To: homestead AT lists.ibiblio.org
  • Subject: Re: [Homestead] Homestead tools
  • Date: Thu, 18 Nov 2004 10:44:30 -0500

Gene GeRue wrote:

Has anyone found a test that discovered the best batteries?


Excerpts From: http://tinyurl.com/6x6py

"Traditionally, cordless power tools have used nickel-cadmium batteries.

"However, some observers believe nickel-cadmium has reached is capacity ceiling. Many end users are demanding longer run times and better performance. Cadmium also poses an environmental hazard. As a result, nickel-cadmium cells are increasingly being replaced by other types of rechargeable batteries.

"Many cordless tool manufacturers are converting to nickel-metal hydride, a technology that has similar characteristics to nickel-cadmium, in that it accepts fast and continuous charging.

"The typical nickel-metal hydride cell costs more and has half the service life of the typical nickel-cadmium battery, but it also has 30 percent more capacity, increased power density and less memory effect. The battery doesn't have to be fully discharged before being recharged. Increased energy density offers longer service life between charges, while lack of cadmium, lead or mercury makes it environmentally friendly.

"Other battery technology may soon be available to cordless tool users, such as lithium-ion, lithium-ion polymer, lithium-iron disulfide and zinc-air. Portable fuel cells are another power option that may be coming soon to a cordless tool near you. But, widespread application of these technologies is currently limited due to exorbitant costs."







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