Author: Ignoramus2168Date: 12:48 02-07-07
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My Motorola cell phone has a matchbook sized cell phone battery. If it
is discharged, it takes approximately 3 hours to charge from the AC
adaptor.
My question is WTF.
My 100 times bigger DeWalt battery can be charged in several times
less time than that. Can't someone finally make a good AC wall
charger?
Is there some device that I am missing. It is not rocket science.
i
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Author: Tom BiasiDate: 12:58 02-07-07
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"Ignoramus2168" <ignoramus2168@NOSPAM.2168.invalid> wrote in message
news:IdqdnWUJPM_7sRTbnZ2dnUVZ_s-rnZ2d@giganews.com...
> My Motorola cell phone has a matchbook sized cell phone battery. If it
> is discharged, it takes approximately 3 hours to charge from the AC
> adaptor.
>
> My question is WTF.
>
> My 100 times bigger DeWalt battery can be charged in several times
> less time than that. Can't someone finally make a good AC wall
> charger?
>
> Is there some device that I am missing. It is not rocket science.
>
> i
Hi,
The designer will have the battery charge according to its required
parameters.
Within these parameters there is a range of acceptable charge conditions.
Power tool users want the unit in service ASAP so the charge is fast.
Cell phone users usually want the battery to last as long as possible so the
charge rate accommodates that.
In short,
Batteries have different chemical makeup and require different charging
conditions. The manufacturers try to optimize the use of the product.
Regards,
Tom
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Author: BrentDate: 13:21 02-07-07
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On Jul 2, 12:48 pm, Ignoramus2168 <ignoramus2...@NOSPAM.2168.invalid>
wrote:
> My Motorola cell phone has a matchbook sized cell phone battery. If it
> is discharged, it takes approximately 3 hours to charge from the AC
> adaptor.
>
> My question is WTF.
>
> My 100 times bigger DeWalt battery can be charged in several times
> less time than that. Can't someone finally make a good AC wall
> charger?
>
> Is there some device that I am missing. It is not rocket science.
>
> i
most cell chargers are designed for trickle charging to avoid heat
buildup or to charge off the power provided by the USB bus of a
computer
Power tools arent as picky about contact with skin or heating the
cells up (my hitachi lithium has a fan on the charger)
I think part of the theory is to charge the cell while its user sleeps
or it otherwise stationary whereas if youre charging a tool battery
its genrally to use it
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On Jul 2, 9:48 am, Ignoramus2168 <ignoramus2...@NOSPAM.2168.invalid>
wrote:
> My Motorola cell phone has a matchbook sized cell phone battery. If it
> is discharged, it takes approximately 3 hours to charge from the AC
> adaptor.
>
> My question is WTF.
>
> My 100 times bigger DeWalt battery can be charged in several times
> less time than that. Can't someone finally make a good AC wall
> charger?
>
> Is there some device that I am missing. It is not rocket science.
>
> i
I suspect the ability to dissipate the heat generated by the charging
current is the difference. Another difference is the chemistry in the
two batteries. Your DeWalt is probably nicad while the cell phone is
NMH, or perhaps some more exotic chemistry.
Paul
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Author: Tom GardnerDate: 13:51 02-07-07
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"Ignoramus2168" <ignoramus2168@NOSPAM.2168.invalid> wrote in message
news:IdqdnWUJPM_7sRTbnZ2dnUVZ_s-rnZ2d@giganews.com...
> My Motorola cell phone has a matchbook sized cell phone battery. If it
> is discharged, it takes approximately 3 hours to charge from the AC
> adaptor.
>
> My question is WTF.
>
> My 100 times bigger DeWalt battery can be charged in several times
> less time than that. Can't someone finally make a good AC wall
> charger?
>
> Is there some device that I am missing. It is not rocket science.
>
> i
Get a DeWalt cell phone!
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Author: bDate: 15:12 02-07-07
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Your cell fone's battery is probably lithium-ion and it has strict charging
requirements that are usually computer controlled. Your cell fone probably
is the computer that is controlling its needs.
b
"Ignoramus2168" <ignoramus2168@NOSPAM.2168.invalid> wrote in message
news:IdqdnWUJPM_7sRTbnZ2dnUVZ_s-rnZ2d@giganews.com...
> My Motorola cell phone has a matchbook sized cell phone battery. If it
> is discharged, it takes approximately 3 hours to charge from the AC
> adaptor.
>
> My question is WTF.
>
> My 100 times bigger DeWalt battery can be charged in several times
> less time than that. Can't someone finally make a good AC wall
> charger?
>
> Is there some device that I am missing. It is not rocket science.
>
> i
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Author: Leon FiskDate: 15:34 02-07-07
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On Mon, 02 Jul 2007 11:48:38 -0500, Ignoramus2168
<ignoramus2168@NOSPAM.2168.invalid> wrote:
>My Motorola cell phone has a matchbook sized cell phone battery. If it
>is discharged, it takes approximately 3 hours to charge from the AC
>adaptor.
>
>My question is WTF.
>
>My 100 times bigger DeWalt battery can be charged in several times
>less time than that. Can't someone finally make a good AC wall
>charger?
>
>Is there some device that I am missing. It is not rocket science.
For the most part the faster you recharge a battery the
shorter its life span. Three hours isn't all that bad though
for a decent charge. They are probably trying to balance
re-charge time with warranty expiration date.
Their (Motorola) old two-way radio equipment from a few
years ago use to take 12-16 hours with a "standard" charger.
Go talk to any of your local police agencies and ask them
about radio/phone batteries, cost, charging times, life
expectancy... you'll surely get an earful that you won't
soon forget :)
--
Leon Fisk
Grand Rapids MI/Zone 5b
Remove no.spam for email
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Author: Wild_BillDate: 16:37 02-07-07
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I haven't bothered to look into the numerous consumer alert-type stories
that have been on the TV news, but there have been quite a few regarding
laptop and cell phone batteries starting fires, sometimes in pockets,
briefcases or luggage.
It's been suggested/discussed here in RCM before, that in general, the best
battery charging is slow charging.. both in terms of quality/level of
battery output and long battery life.
The instant gratification or demand for instantaneous results (commercial
uses) of power tool, or critical use batteries have contributed to the
availability of rapid-charging battery chemistry and construction design
technology.
Forcing rapid chemical changes can't be good for long battery life, and
probably reduces the useful charge output, in most cases (for most types of
batteries).
WB
.........
metalworking projects
www.kwagmire.com/metal_proj.html
"Ignoramus2168" <ignoramus2168@NOSPAM.2168.invalid> wrote in message
news:IdqdnWUJPM_7sRTbnZ2dnUVZ_s-rnZ2d@giganews.com...
> My Motorola cell phone has a matchbook sized cell phone battery. If it
> is discharged, it takes approximately 3 hours to charge from the AC
> adaptor.
>
> My question is WTF.
>
> My 100 times bigger DeWalt battery can be charged in several times
> less time than that. Can't someone finally make a good AC wall
> charger?
>
> Is there some device that I am missing. It is not rocket science.
>
> i
--
Posted via a free Usenet account from http://www.teranews.com
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Author: EeyoreDate: 19:19 02-07-07
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Ignoramus2168 wrote:
> My Motorola cell phone has a matchbook sized cell phone battery. If it
> is discharged, it takes approximately 3 hours to charge from the AC
> adaptor.
>
> My question is WTF.
>
> My 100 times bigger DeWalt battery can be charged in several times
> less time than that. Can't someone finally make a good AC wall
> charger?
>
> Is there some device that I am missing. It is not rocket science.
The minimum time to recharge a battery is restricted by the charge rate it can
accept.
Graham
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Author: JR NorthDate: 21:49 02-07-07
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Tom routinely thinks outside the box. Classic example.
JR
Dweller in the cellar
Tom Gardner wrote:
>
> Get a DeWalt cell phone!
>
>
--
--------------------------------------------------------------
Home Page: http://www.seanet.com/~jasonrnorth
If you're not the lead dog, the view never changes
Doubt yourself, and the real world will eat you alive
The world doesn't revolve around you, it revolves around me
No skeletons in the closet; just decomposing corpses
--------------------------------------------------------------
Dependence is Vulnerability:
--------------------------------------------------------------
"Open the Pod Bay Doors please, Hal"
"I'm sorry, Dave, I'm afraid I can't do that.."
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Author: JR NorthDate: 21:51 02-07-07
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My 2600 MAH AA Nimh cells fast charge in 3 hours, and get moderately
warm doing so. As others have pointed out, heat dissipation is the key.
JR
Dweller in the cellar
Ignoramus2168 wrote:
> My Motorola cell phone has a matchbook sized cell phone battery. If it
> is discharged, it takes approximately 3 hours to charge from the AC
> adaptor.
>
> My question is WTF.
>
> My 100 times bigger DeWalt battery can be charged in several times
> less time than that. Can't someone finally make a good AC wall
> charger?
>
> Is there some device that I am missing. It is not rocket science.
>
> i
--
--------------------------------------------------------------
Home Page: http://www.seanet.com/~jasonrnorth
If you're not the lead dog, the view never changes
Doubt yourself, and the real world will eat you alive
The world doesn't revolve around you, it revolves around me
No skeletons in the closet; just decomposing corpses
--------------------------------------------------------------
Dependence is Vulnerability:
--------------------------------------------------------------
"Open the Pod Bay Doors please, Hal"
"I'm sorry, Dave, I'm afraid I can't do that.."
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Author: Martin H. EastburnDate: 22:31 02-07-07
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Your DeWalt battery gets very hot doesn't it. It is out in the
air. The smaller battery that is inside a cover that might heat sink
and might be even a heat source... Trickle current to slowly charge.
One hint - 120v chargers put out 10% more than operating current.
Turn off cell phone and then plug it in. Faster charge.
Get a car unit - plug into the 12V socket - charges faster in any mode.
Higher current available.
I keep the car one in the car at all times. I can get it if I need it
for use on the tractor or generator (power out).
We charge at night - off and charge. Seems to work for us.
I think the real trick for you is turning off the cell.
Martin
Martin H. Eastburn
@ home at Lions' Lair with our computer lionslair at consolidated dot net
TSRA, Life; NRA LOH & Endowment Member, Golden Eagle, Patriot's Medal.
NRA Second Amendment Task Force Charter Founder
IHMSA and NRA Metallic Silhouette maker & member.
http://lufkinced.com/
Ignoramus2168 wrote:
> My Motorola cell phone has a matchbook sized cell phone battery. If it
> is discharged, it takes approximately 3 hours to charge from the AC
> adaptor.
>
> My question is WTF.
>
> My 100 times bigger DeWalt battery can be charged in several times
> less time than that. Can't someone finally make a good AC wall
> charger?
>
> Is there some device that I am missing. It is not rocket science.
>
> i
----== Posted via Newsfeeds.Com - Unlimited-Unrestricted-Secure Usenet News==----
http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups
----= East and West-Coast Server Farms - Total Privacy via Encryption =----
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Author: EeyoreDate: 22:44 02-07-07
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"Martin H. Eastburn" wrote:
> One hint - 120v chargers put out 10% more than operating current.
Only 10% more ? You have to be joking.
Graham
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Author: Don KlipsteinDate: 00:05 03-07-07
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In article <GcSdnVsbV_klNhTbnZ2dnUVZ_sWdnZ2d@seanet.com>, JR North wrote:
>My 2600 MAH AA Nimh cells fast charge in 3 hours, and get moderately
>warm doing so. As others have pointed out, heat dissipation is the key.
In my experience, at a 3-4 hour rate, the cells only noticeably warm up
from getting fully charged and beginning to be overcharged. It appears to
me that most "smart chargers" detect full charge by detecting directly or
indirectly this temperature rise. What I suspect is an indirect detection
of temperature rise is cell voltage decreasing after peaking from full
charge. I suspect this is why "smart chargers" tend to work with shorter
charging times of 4 hours or less.
Meanwhile, there are some aggressive chargers out there, such as 30 and
15 minute chargers for AA NiMH cells. 15 minute chargers require
compatible cells of especially low resistance. I have a charger that
actually charges 2,000 mAH AA cells in 15-18 minutes. It has a fan. The
cells get fairly warm during charging, and are almost too hot to hold
when they reach full charge.
- Don Klipstein (don@misty.com)
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Author: Cydrome LeaderDate: 01:32 03-07-07
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In rec.crafts.metalworking Don Klipstein <don@manx.misty.com> wrote:
> In article <GcSdnVsbV_klNhTbnZ2dnUVZ_sWdnZ2d@seanet.com>, JR North wrote:
>>My 2600 MAH AA Nimh cells fast charge in 3 hours, and get moderately
>>warm doing so. As others have pointed out, heat dissipation is the key.
>
> In my experience, at a 3-4 hour rate, the cells only noticeably warm up
> from getting fully charged and beginning to be overcharged. It appears to
> me that most "smart chargers" detect full charge by detecting directly or
> indirectly this temperature rise. What I suspect is an indirect detection
> of temperature rise is cell voltage decreasing after peaking from full
> charge. I suspect this is why "smart chargers" tend to work with shorter
> charging times of 4 hours or less.
>
> Meanwhile, there are some aggressive chargers out there, such as 30 and
> 15 minute chargers for AA NiMH cells. 15 minute chargers require
> compatible cells of especially low resistance. I have a charger that
> actually charges 2,000 mAH AA cells in 15-18 minutes. It has a fan. The
> cells get fairly warm during charging, and are almost too hot to hold
> when they reach full charge.
>
> - Don Klipstein (don@misty.com)
I had a rechargable battery explode in my hand. It unwound like a biscuit
can, and startled me. Hot batteries apparently have a bit of pressure in
them.
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Author: John HusvarDate: 09:30 03-07-07
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In article <4689B836.6F29AC41@hotmail.com>,
Eeyore <rabbitsfriendsandrelations@hotmail.com> wrote:
> "Martin H. Eastburn" wrote:
>
> > One hint - 120v chargers put out 10% more than operating current.
>
> Only 10% more ? You have to be joking.
>
> Graham
Most of the battery folks I deal with recommend a charge rate of 1/10
the amp-hour capacity of the battery unless the battery is made
specifically for fast charging. Fast recharge batteries get really warm
toward the end of the charging cycle too.
The new lithium-iron phosphate chemistry looks promising since it can
handle the high discharge rates and has very good recharge rate,
capacity and cycle rating. (one-third to one-fourth size for a given
amp-hour capacity and recharge time of 1-1/2 to 2 hours for wheelchair
service and ~5000 charge cycles, for example)
Ya wanna see a lithium battery get hot? Short one. Wear safety
equipment.:)
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Author: EeyoreDate: 11:42 03-07-07
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John Husvar wrote:
> Eeyore <rabbitsfriendsandrelations@hotmail.com> wrote:
> > "Martin H. Eastburn" wrote:
> >
> > > One hint - 120v chargers put out 10% more than operating current.
> >
> > Only 10% more ? You have to be joking.
>
>
> Most of the battery folks I deal with recommend a charge rate of 1/10
> the amp-hour capacity of the battery unless the battery is made
> specifically for fast charging. Fast recharge batteries get really warm
> toward the end of the charging cycle too.
Cellphone batteries *are* designed for faster than 10 hour recharge though.
That's not what the previous poster said anyway.
Graham
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On Jul 2, 9:48 am, Ignoramus2168 <ignoramus2...@NOSPAM.2168.invalid>
wrote:
> My Motorola cell phone has a matchbook sized cell phone battery. If it
> is discharged, it takes approximately 3 hours to charge from the AC
> adaptor.
>
> My question is WTF.
>
> My 100 times bigger DeWalt battery can be charged in several times
> less time than that. Can't someone finally make a good AC wall
> charger?
>
> Is there some device that I am missing. It is not rocket science.
>
> i
Most cell phones I've owned lately, have had optional "travel-
chargers" available from the manufacturer, which charges the battery
in about 1 hour. Also the phone controls the charging so that when the
battery is fully charged, it will stop charging. So, I don't think
that the long charge times are unavoidable due to the battery type
itself. There has to be another explanation... maybe it's a marketing
thing... include the "slow" charger with the phone and sell the faster
one as an "option" for about $40 more.
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Author: Robert SwinneyDate: 19:15 03-07-07
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Martin sez:
"> I think the real trick for you is turning off the cell".
Right on Martin. It would be a real trick, and one he is incapable of.
Iggy won't turn off any appliance he can bleat incessantly over and make a
general nuisance out of himself.
Bob Swinney
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Author: craigmDate: 20:14 03-07-07
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MetLWurker@aol.com wrote:
> On Jul 2, 9:48 am, Ignoramus2168 <ignoramus2...@NOSPAM.2168.invalid>
> wrote:
>> My Motorola cell phone has a matchbook sized cell phone battery. If it
>> is discharged, it takes approximately 3 hours to charge from the AC
>> adaptor.
>>
>> My question is WTF.
>>
>> My 100 times bigger DeWalt battery can be charged in several times
>> less time than that. Can't someone finally make a good AC wall
>> charger?
>>
>> Is there some device that I am missing. It is not rocket science.
>>
>> i
>
> Most cell phones I've owned lately, have had optional "travel-
> chargers" available from the manufacturer, which charges the battery
> in about 1 hour. Also the phone controls the charging so that when the
> battery is fully charged, it will stop charging. So, I don't think
> that the long charge times are unavoidable due to the battery type
> itself. There has to be another explanation... maybe it's a marketing
> thing... include the "slow" charger with the phone and sell the faster
> one as an "option" for about $40 more.
Try using google for answers. With very little efforts you can find this.
http://www.batteryuniversity.com/partone-12.htm
or this
http://www.powerstream.com/li.htm
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