[TechAssist] Re: Ni-Cad Batteries
- From: "David Eugene Waybright" <David@xxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Mon, 8 Sep 2003 13:54:09 -0400
I thought I would add what I've learned about Rechargeable batteries.
There are 4 types I know of:
Nickel-Cadmium (NiCD)
-Was standard for portable computers until 1992
-NiCD batteries have been replaced by NiMH and Li-ion
-Has a Memory effect
-Less energy by weight
-Uses nickel hydroxide and cadmium electrodes with potassium hydroxide
as the electrolyte
Nickel-Metal Hydride (NiMH)
-Introduced in 1990
-Rapidly took market away from NiCD in portable computers
-Still has small Memory effect
-Different from NiCD only by their negative electrode which is made of a
metal alloy capable of storing a large amount of electrons
-Metal hydride is produced as the charging product
-Energy by weight is almost 50% greater than NiCD
Lithium-Ion (Li-ion)
-Very good energy to weight ratio
-Found in high end laptop computers and cellular phones
-Took market from NiMH from portable computers
-Has very little if no Memory effect at all
-Made from layered sheets of aluminum foil coated with cobalt oxide,
which acts as the cathode with the anode made from a thin copper sheet
coated with carbon materials. The thin film cathode and anode are
separated by a sheet of plastic, rolled up together in a spiral and
immersed in a liquid electrolyte medium of Lithium.
-These batteries produce the same energy as NiMH batteries but are 40%
smaller, half the weight, and are better for the environment because
they don't contain toxic materials such as cadmium or mercury.
-Currently more expensive than a comparable NiMH battery.
Lithium-ion Polymer (Li-ion Polymer)
-Sometimes misleadingly called Lithium Polymer. True pure Lithium
Polymer batteries won't be out till about 2005.
-Check this site for Pros/Cons of Li-Ion Polymer and how it compares to
Li-ion and (pure) Lithium Polymer batteries:
http://www.buchmann.ca/Article6-Page1.asp
Hope this helps.
Thank you,
David Waybright
David@xxxxxxxxx
http://home.iximd.com/~david
A+ Computer Repair Technician
NET+ Network Repair Technician
-----Original Message-----
From: techassist-bounce@xxxxxxxxxxxxx
[mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of Doug Keller
Sent: Monday, September 08, 2003 8:36 AM
To: techassist@xxxxxxxxxxxxx
Subject: [TechAssist] Ni-Cad Batteries
Someone mentioned some time ago about "zapping" ni-cad
batteries to exrend their life. Exactly what does "zapping"
consist of? These things are too expensive to replace every 6
months.
Doug
--
Doug Keller "Learn from the mistakes of others,
Wis-Kel Electronics because you won't live long enough
101 Freeland Ave. to make them all yourself"
Terra Alta, WV
USA 26764
dek@xxxxxxxxxx
http://www.tech-assist.org
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