Fuelzilla
Hybrid Car - More Fun with Less Gas
Environmentally Friendly Driving

Re: what's up with nicad batteries?
Groups | Search | About
Login Password
Register Now! Lost Password?

Home Power - Home Power/Home-Made Power for Off-Grid Living. 

Bookmark this page:  YahooMyWeb Yahoo!  Google Google  Windows Live Favorites Windows Live  del.icio.us del.icio.us  digg digg  Add to Netscape Netscape
Subject Author Date
Re: what's up with nicad batteries? Eeyore 10-11-2007
Posted by on October 17, 2007, 5:31 pm
Please log in for more thread options
>
>
>me@privacy.net wrote:
>
>> >Nicads have been eclipsed by NiMH batteries.
>>
>> Are Li -ions even better than NiMH tho?
>
>Define 'better'. What criteria are important to you ?
>
>Graham
>


Light weight and longer life, more torque maybe?

Something you could use to build say a deck outside
with...driving self tapping screws and such.

I know that nicad wont be a good bet.... but unsure of
NiMH or Li-ion units

Posted by Eeyore on October 17, 2007, 6:39 pm
Please log in for more thread options

me@privacy.net wrote:

> >me@privacy.net wrote:
> >
> >> >Nicads have been eclipsed by NiMH batteries.
> >>
> >> Are Li -ions even better than NiMH tho?
> >
> >Define 'better'. What criteria are important to you ?
>
> Light weight and longer life, more torque maybe?

You mean current delivery I suspect.


> Something you could use to build say a deck outside
> with...driving self tapping screws and such.
>
> I know that nicad wont be a good bet.... but unsure of
> NiMH or Li-ion units

I'd suggest you start here. Both have characteristics that may be more or less
suitable than each other depending on the actual application.

Note that NiMH battteries have a significant self-discharge rate that renders
them unsuitable in applications that require a long 'standby' time. A couple of
manufacturers have improved this recently with new NiMH chemistry but it's still
a problem with most NiMHs.

http://en.wikipedia.org/wiki/Lithium_ion_battery
http://en.wikipedia.org/wiki/Nickel_metal_hydride_battery

Graham



Posted by Neon John on October 17, 2007, 7:03 pm
Please log in for more thread options
On Wed, 17 Oct 2007 16:31:43 -0500, me@privacy.net wrote:


>Light weight and longer life, more torque maybe?
>
>Something you could use to build say a deck outside
>with...driving self tapping screws and such.
>
>I know that nicad wont be a good bet.... but unsure of
>NiMH or Li-ion units

I'd hate to think how many deck screws my 10 year old 18 volt DeWalt cordless
drill
has driven. NiCADs and not NiMH. NiCADS still rule for power density. That
is, the
ability to deliver high current (and thus power) from a small package. The
energy
density trails behind NiMH and Li but that's usually not an issue with a portable
tool.

That said, the Milwaukee and DeWalt Li battery tools kick ass. The Milwaukee is
28
volts with about twice the ah capacity and yet about 2/3s the weight. Both use
newly
developed (but different) chemistries that deliver quite high currents.

I'm much more familiar with the Milwaukee because I have a friend who is an
official
service center for Milwaukee and he shoots me all the V28 batteries that they
warrantee. Invariably one bad cell and the rest are fine. Amazing battery
management system inside the pack. Each cell is charged-managed individually.

If I didn't already have a rather full set of DeWalt tools I'd be right on top
of the
V28 Milwaukee line.

John
--
John De Armond
See my website for my current email address
http://www.neon-john.com
http://www.johndearmond.com <-- best little blog on the net!
Tellico Plains, Occupied TN
You have a magnetic personality... That must be why all your mental floppies are
blank.


Posted by Bob Adkins on October 18, 2007, 6:41 am
Please log in for more thread options


>That said, the Milwaukee and DeWalt Li battery tools kick ass. The Milwaukee
is 28
>volts with about twice the ah capacity and yet about 2/3s the weight. Both use
newly
>developed (but different) chemistries that deliver quite high currents.

If Li batteries are so great, why do hybrid cars use NiCd's in their
packs? Maybe because the Li cells are subject to catch fire?

>I'm much more familiar with the Milwaukee because I have a friend who is an
official
>service center for Milwaukee and he shoots me all the V28 batteries that they
>warrantee. Invariably one bad cell and the rest are fine. Amazing battery
>management system inside the pack. Each cell is charged-managed individually.
>
>If I didn't already have a rather full set of DeWalt tools I'd be right on top
of the
>V28 Milwaukee line.

Anyone tried the Ryobi tools? They have a "1 battery fits all" scheme.

I'm fed up with battery powered tools. There should be standards so
that all 12v, 14v, 18v, 19v, etc. fit all power tools of the same
voltage rating. If your drill breaks, you may have to throw away 2 or
3 good battery packs. If your batteries die, you may have to throw
away a perfectly good drill or saw because you can't find economical
battery packs . Phooey on that. Also phooey on $85 battery packs. You
can buy a decent drill with 2 batteries and a charger for $40.
-

Bob

Posted by Eeyore on October 18, 2007, 6:59 am
Please log in for more thread options


Bob Adkins wrote:

>
> >That said, the Milwaukee and DeWalt Li battery tools kick ass. The Milwaukee
is 28
> >volts with about twice the ah capacity and yet about 2/3s the weight. Both
use newly
> >developed (but different) chemistries that deliver quite high currents.
>
> If Li batteries are so great, why do hybrid cars use NiCd's in their
> packs?

Which cars use Nicads ?

Graham


Similar ThreadsPosted
Re: what's up with nicad batteries? October 11, 2007, 3:37 pm
Re: what's up with nicad batteries? October 12, 2007, 4:54 pm
Re: what's up with nicad batteries? October 12, 2007, 5:19 pm
Where Do You Get Your Batteries? January 11, 2007, 7:42 pm
Batteries are the key January 25, 2007, 3:32 pm
Re: Batteries for sale March 22, 2007, 8:15 pm
Re: Feedback on batteries. March 28, 2008, 4:29 pm
Re: Feedback on batteries. March 28, 2008, 4:37 pm
Re: Feedback on batteries. March 31, 2008, 10:49 pm
Reconditioning batteries July 4, 2008, 2:10 pm

Contact Us | Privacy Policy
XML SitemapXML Sitemap