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-----Original Message-----for a
From: phys-l-bounces@carnot.physics.buffalo.edu [mailto:phys-l-
bounces@carnot.physics.buffalo.edu] On Behalf Of John SOHL
Sent: Wednesday, January 09, 2008 12:35 PM
To: phys-l@carnot.physics.buffalo.edu
Subject: Re: [Phys-l] lithium batteries
I've been doing a lot of research on batteries and battery charging
camping tent light product that I've developed called the "firefly"tip.
(patent pending). Charging and discharging batteries is a remarkably
complex process. All chemistry is temperature dependent and battery
behavior involves a lot of chemistry and physics. Here is an inside
If you charge your Li ion batteries in the garage or other cold (oryou
particularly hot) environment, you might want to change that. Unless
know for a fact that your charger was designed for charging coldbuild
batteries, you should charge your batteries at room temperature. (An
option that I don't have with a camping product. Thus, I've had to
in ambient thermal sensors and battery thermal sensors as part of mya
charging circuits.)
One of the best web sites that I've found with general information at
level that is a fast and easy read is the Battery University. The pageof
interest for the discussion on battery storage and lifetime is:manufacturers
http://batteryuniversity.com/parttwo-34.htm
Note, battery composition is not a fixed thing. Different
use different balances and elements from each other. Thus, it mightwell
be true that a particular battery is best stored dead, but everythingI've
been reading says you should store your Li ion batteries somewherebetween
40% and 100% charged depending on how often you use the battery.and
John
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
John E. Sohl, Ph.D.
Professor of Physics
Weber State University
2508 University Circle
Ogden, UT 84408-2508
voice: (801) 626-7907, fax: (801) 626-7445
e-mail: jsohl@weber.edu
web: http://physics.weber.edu/sohl/
According to these people, lithium-ion batteries are best stored atJeff Radtke <jr@cloudchambers.com> 1/8/2008 8:55 PM >>>
40% charge:
http://www.batteryuniversity.com/partone-19.htm
The newer A123 lithium nanophosphate batteries are best stored at
higher levels of charge, about 95%.
http://www.rcuniverse.com/forum/m_5048617/tm.htm
The A123 cells are fantastic: best cycle life with highest discharge
and charge currents. I built a cyclemotor that uses them:
http://www.neodymics.com/drivetrain.htm
--
Jeff Radtke
jr@cloudchambers.com
www.cloudchambers.com
Who stores all of his alkaline and zinc/carbon batteries on the fridge
shelf, where they last at least twice as long. See Fig 14.2.E in
Horowitz and Hill's "The Art of Electronics."
Quoting Bernard Cleyet <bernardcleyet@razzolink.com>:
New to me. I'll query the PHYS-L crew
T.K.Wang & Mary Brooks wrote:
According to the Canon instruction book, a lithium battery wears
itself out by being charged. they recommend DISCHARGING a battery
use.then storing it (when for a long time) and charging it the day of
Just the opposite of Nicads._______________________________________________
T.K.
Forum for Physics Educators
Phys-l@carnot.physics.buffalo.edu
https://carnot.physics.buffalo.edu/mailman/listinfo/phys-l
_______________________________________________
Forum for Physics Educators
Phys-l@carnot.physics.buffalo.edu
https://carnot.physics.buffalo.edu/mailman/listinfo/phys-l