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Sci.Electronics.Basics is a worldwide Usenet news group that is used to discuss basic electronics questions.
We found 83 threads matching "nimh"
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The most relevant threads are listed first
Nimh batteries
Eder - 2007-02-08 15:31:00
I have bought some AA Nimh batteries and find that they are vary
slightly bigger than standard alkalines. I'm talking about a
millimetre or two and not much more, but it's enough to make them an
extremely tight fit in devices that have two batteries stacked on top
of each other.
I was wondering...
NiMH 1.2V charger
2006-12-29 13:29:00
I'm looking for a good design (with schematic) to charge single 1.2V
NiMH batteries.
Not two in series, not three or four in series: individual batteries.
Schematics of chargers which can handle 4 batteries in parallel
(charging individually) would be appreciated too.
I've got some NiMH b...Re: Looking for rechargeable 9v battery recommendation tia sal2
redbelly - 2006-08-30 16:20:00
temp@temp.com wrote:
> Greets All
>
> I'm going to be traveling and have a small device that needs to run 3 hours
> on a 9v battery everyday. I'm looking for a good/great rechargeable 9v
> battery. I'll have to get 2 of them so I will be able to use one while the
> other one is in the ...Can I replace NiCad with NiMH?
Mitch - 2007-03-28 11:49:00
I have some rechargable wireless headphones that I use on the
treadmill. The NiCads have developed so much memory that they only
last about 1/2 hour.
Can I replace them with NiMH? Will the charging dock handle them the
same?
...rechargable batteries for solar lights
z - 2009-07-20 02:50:00
I'm generally OK with electronical things, but hardly an expert on
rechargables, from reading the posts here. So, thanks in advance;
here's the question:
Like a lot of folks, i have a pile of those solar yard lights with a
couple of rechargable AA nicads, which have lost their capacity to
sto...Re: How hot should NiMH's get in the charger
torbjorn.ekstrom - 2007-07-23 12:22:00
Jasen Betts wrote:
> On 2007-07-22, Bearded Occam wrote:
>
> > New subscriber here.
> >
> > I have a set of Sony AA size NiMH's that are the original batteries
> > which came with the charger. Upon charging for a couple hours, they
> > are almost too hot to hold in my hand.
> >
> ...Re: How to charge 3.6VDC battery with DC Power Supply
Tim Wescott - 2010-03-02 11:55:00
jg wrote:
> I have a few Rayovac Camcorder 3.6V/2500 mAh batteries that I want to
> charge. These were originally charged with a camcorder that I do not
> have. However, I have the next best thing. I have a DC Power Supply
> (BK Precision 1660A) with both voltage control and current contr...Re: Maxim 712 NiMH Charger Cutoff Temperature
Brendan Gillatt - 2009-05-08 19:55:00
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
Joe wrote:
> I built a NiMH charger based on the Maxim 712 chip some time ago.
>
> I didn't implement the temperature cutoff part of the chip's capability,
> and now would like to do that.
>
> Here's the main question:
>
> How much...Re: rectifying photovoltaic
rabiticide - 2008-12-31 01:12:00
okay I'm going to try them in parallel with the schottky diodes and if
that does not work ... series connection will be okay? I don't know
what a "buck switcher" is... it's a cheap set-up from Kmart which
charges 3, AA NiMH batteries...
...Re: "Simple" hour/minute binary clock?
Jeff Findley - 2006-10-20 08:43:00
wrote in message
news:1161346654.772369.59030@m7g2000cwm.googlegroups.com...
>
> Battery voltage doesn't matter, whatever will drive the circuit. I'd
> prefer to not use one of the huge 12v flashlight batteries though,
> since I wanted to hook a few batts up in parallel and mount cli...Two battery related questions ...
purple_stars - 2006-12-12 23:09:00
Hi folks,
I use a bank of NiMH batteries to power some mobile equipment and I
currently charge the bank with a small 6.5 watt folding solar panel.
Works great. One nice extra of this setup is that the banks are made
from AA batteries so I can swap out charged batteries from the banks
and put...# of batteries to cause polarity reversal
2007-01-16 03:55:00
If I have two NiMH batteries in series under a load, and one is weaker
than the other, is it possible for the stronger one to force the weaker
one to reverse polarity?
...Re: Battery for Winbook XLI Laptop
John - 2006-10-02 14:43:00
On Mon, 02 Oct 2006 17:26:42 GMT, "W. Watson"
wrote:
> I contacted a battery store in Palo Alto about the battery for an Xli, and
> they said they no longer carry them, since they have proven unreliable. This
> might be the case. Certainly within three years of having this laptop, the
> ba...Battery Charger Temperature Cutoff
Joe - 2007-07-22 21:45:00
I built a NiMH charger based on the Maxim 712 chip some time ago.
I didn't implement the temperature cutoff part of the chip's capability,
and now would like to do that.
Here's the main question:
How much above ambient temperature should the cutoff be?
Thanks.
--- Joe
...Rechargable battery power
Rod@Hillhead - 2007-01-17 16:43:00
Hi,
I have connected 5 new NiMh batteries in series, each is rated at 3800
mAH. When I connect a 10W, 6v halogen bulb to them it lasts about 2
hrs. I expected longer than this, calculating that the current should
be 1.6 amps through the bulb, and the battery pack should have 5 x 3.8
Ahr = 19 ...Re: solar powered yard lights etc.
Tom Biasi - 2008-10-16 11:34:00
"z" wrote in message
news:72b6968f-4f2b-4457-baf1-701aca5d0d90@r66g2000hsg.googlegroups.com...
> any reason not to replace the rechargable batteries they come with
> with something with more capacity, when the batteries die?
The only problem you may have is the ability of the system t...Re: Question - 9v Battery Heating in simplest circuit
Paul E. Schoen - 2008-10-21 01:27:00
"John Larkin" wrote in message
news:8jnqf4t3b92t9lku1j6jurmhkb2q23bpan@4ax.com...
>
> I stuck a 9 volt battery in my pocket a while back, and it managed to
> face down into some coins and get shorted. It got HOT! Weird
> sensation.
Just last night I helped someone measure the volta...Re: IBM's Super Battery
Greegor - 2009-06-15 18:25:00
Wasn't it IBM that came up with carbon nanorods
that are supposed to revolutionize battery capacity?
As anodes they were supposed to multiply the
capacity of batteries by 10x.
What was the enhancement that already
multiplied the capacity of NIMH batteries by 10x?
...Help me build a bicycle phone charger
BikePilgrim - 2008-01-07 19:36:00
Hello, I recently built-up a front wheel for my bicycle that has a 6v/
3.5w dynamo. These are designed to power headlamps, but I'd prefer to
store the electricity in a battery which could charge my phone. I
believe iPhones charge on standard USB.
My first question is about the battery. Of cour...Re: Powering Rope Light With Batteries?
Eeyore - 2006-11-18 15:22:00
j.rumao@gmail.com wrote:
> Well, I was hoping to use anywhere from AA's to D's if possible, and
> work a switch in there as well. Radioshack sells boxes that can hold
> the batteries and contain a switch, I'm just not sure if this would
> even be feasible. Is it?
Not even remotely s...Re: Why Electric Motors Are 3X - 4X More Efficient Than Internal Combustion
RLDeboni - 2008-08-16 06:05:00
John Larkin wrote:
> 5PM, I'm in a hotel in Santa Barbara. We had a late breakfast in San
> Francisco.
It's a long trip for an electric car ...
I am thinking about commuting, about 50 km range.
> We stopped for gas once, for about 5 minutes, and ran 75-80
> MPH most of the way. And w...NiMH power weight ratio
2007-01-08 22:31:00
Just wondering if anyone knows the weight of these batteries?
AAA 900mAH
AA 2500mAH
or will they vary between manufacturers?
I'm trying to work out whether 4 x AAA or 2 x AA has the better power
to weight ratio. The batteries will feed a step-up converter whose
efficiency depends on the...Re: Solar-recharging garden lights - rewire to mains?
JakeD - 2007-12-25 12:10:00
Just for the record - in case it is of any interest, I connected all
12 lights in parallel, and used just one of the solar-panelled battery
boxes, which I fitted with three fully charged NiMh AA rechargeable
batteries (each 2500 mah). That was three days ago. The lights have
been on ever since...Re: Newbie Q. re: solar light/battery
John Fields - 2008-06-02 18:34:00
On Mon, 02 Jun 2008 08:36:57 -0500, John Fields
wrote:
> On Sun, 01 Jun 2008 16:41:23 -0500, Kris Krieger
> wrote:
>
> > "Tom Biasi" wrote in
> > news:Yd-dnQBiscg2YN_VnZ2dnUVZ_qvinZ2d@giganews.com:
> >
> > >
> > > "Kris Krieger" wrote in message
> > > news:jtadnZ4sbrO...14.4 Volt 30AH Lithium-ion Batteries
Scott - 2007-04-29 07:05:00
High Capacity Batteries AH Lithium, NICD, NiMH, NiFE
Batteries for sale Up tp 1220 AH NiFE calls
14.4 Volt 30AH Lithium-ion Batteries
1000+ Cycles With Protective circuitry
Special Sale $259 + $20 Shipping
http://members.aol.com/scott93727/lith.htm
...References/circuit diagram for "overcharge protection"?
Kris Krieger - 2008-06-08 14:58:00
Hi, all,
Still working on "understanding solar light", hopefully to build one. I
know that it's bad to overcharge batteries, and that retail battery
chargers have "overcharge protection" - I've been trying to find some sort
of illustration/schematic/circuit for how this is done. I only wa...ATTiny13 voltage and current ratings
2007-07-03 04:10:00
I was reading the datasheet on my ATTiny13, and noticed the following
ABSOLUTE MAXIMUM ratings:
Maximum Operating Voltage 6.0V
DC Current Vcc and GND pins: 200 mA
I was planning on powering my device with 4 1.2 NiMH batteries. Do I
still need a 78L05 voltage regulator, or can I skip that?...Alkaline and rechargeable batteries and devices
kimiraikkonen - 2007-11-07 11:07:00
Hi,
I heard something but i want to make sure that i experienced that:
If i use non-alkaline rechargeable batteries (i have GP ones, 1.2V
NiMH) on a mp3 player, after sometime although battery level is shown
%50 full, the mp3 player is turned off unexpectedly by itself.
So, isn't healty to ...Re: AA batteries in AAA slot?
Doug Miller - 2007-06-20 22:02:00
In article , phantom wrote:
> (I had rechargeable AAA and AA alkaline batteries once. They worked,
> but ended up a disappointment. Some leaked, and they permanantly lost
> capacity faster than any other kind of rechargeable battery I have
> ever had, even though they were advertised not ...Re: Can anyone recommend a good AVR book...
linnix - 2006-09-27 13:57:00
> 2) Let's say I want to make a simple AA battery tester (0 to 1.5 VDC
> range), and interface it to the PC via serial port. I know I'll need
> an ADC, and I can probably get away with using the one on the chip
> (comparator, right?). Anyone have any schematic for building such an
> AV...Re: can a charger bought for 2100mAh used for 2500 or 2700 mAh?
2008-02-18 12:02:00
On Feb 16, 6:54=A0pm, interuser wrote:
> Hi.
> I have a sony cybershot photo camera that came with 2100mAh
> rechargeable sony AA batteries and their charger.
> Now the batteries died (after quite some use).
> Can I use the new sony 2500mAh or 2700mAh batteries with this same
> ...Re: Zener Diodes / Voltage Regulation
Charlie Siegrist - 2007-07-22 16:27:00
On Sat, 21 Jul 2007 22:01:28 -0700, in message
, FyberOptic
scribed:
> The basics of diodes has always been "current can only flow one way",
That's a bad assumption, and not the "basics" of diodes at all. Maybe a
Cliff Notes version.
> ...the zener diode apparently [will] "fail" at...Rubbish camera batteries
Periproct - 2007-03-26 17:05:00
My proprietary camera batteries don't last long when new and as I'm not a
photography enthusiast I find, when the camera does come out, the batteries
have discharged to the point of not taking a charge.
My cunning plan is an external battery pack of standard (cheaper and higher
capacity) Ni...Battery suggestion for handheld unit?
Joseph - 2007-02-27 12:44:00
I'm making a handheld unit and the enclosure that was dictated to me does
not have a battery compartment door on it...so I have to use internal
rechargables. my. The unit will get used 1hr/day, 5V @120mA, so my initial
thoughts are to use 2 or 3 AA in series. The product life needs to be 5
...Re: Long term storage of camera batteries
thomas - 2007-05-08 08:37:00
"Grey" wrote in message
news:H6SdnY077O9MfKPbnZ2dnUVZ8sylnZ2d@bt.com...
> My camera uses AA size 1.25v nickel metal hydride batteries and I've just
> had a set die on me. (holds no charge). If I only use the camera every few
> months or so, what is the best way to store them so they w...Re: OT: Ever carry a 9 volt battery in your pocket?
Phil Allison - 2009-06-24 01:01:00
"Bill Bowden"
John Dope
> Bad idea.
>
> Without thinking, I put a 9 volt battery in my pocket. Soon, either
> I noticed it getting warm or maybe my brain simulated it getting
> warm in an effort to get my conscious attention. I promptly removed
> it.
An alkaline or heavy duty type...Re: Use 14.4V NiCad battery through a L7812 regulator?
John Doe - 2009-12-07 10:01:00
Jasen Betts wrote:
> John Doe wrote:
> > I need to power three Cree XLamp XRE LEDs. The standard sealed
> > lead acid battery is 12 V, but it is heavier than I would like
> > to carry. I have some spare rechargeable 14.4 V DeWalt tool
> > batteries.
> >
> > The L7812 re...Re: Grid-Battery "Hybrid" Tractors
John Fields - 2008-08-11 07:13:00
On Sun, 10 Aug 2008 20:45:21 -0700 (PDT), BretCahill@peoplepc.com
wrote:
> > > > > > I DID find a manufacturers folder that reports 119 kWh/kg (better than NiMH) :
> >
> > > > > Energy density just isn't a factor when you can recharge or swap out
> > > > > batteries several times/hr.
> >...Re: Substituting alkaline for ni-mh in Digital Camera
2007-12-20 19:11:00
On Dec 20, 9:30 am, twirling.h...@gmail.com wrote:
> My camera normally takes a 6v .6ah ni-mh battery. I've been able to
> rig-up and power the camera from a 5v 1.5a wall wart, but whenever I
> try powering from a pack of alkalines I get the low battery error.
>
> The batteries all meter ...Lithium Battery for Pogo Radio YourWay?
W. Watson - 2006-11-29 12:51:00
I just called the mfger (Pogo), and they want $20 for the battery, sales
tax, and $8.00 for shipping from S. Calif. to here in N. Calif. I'm not
happy about the shipping costs nor have I been happy about the battery from
day one. I think it was defective but their readout on the radio was
di...