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Sci.Electronics.Basics -> NiMH 1.2V charger
There are 27 messages in this thread.
You are currently looking at messages 1 to 20.
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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 batteries on the fritz, and I'd like to take care of
them as much as possible. Dad had a Ray-o-Vac battery charger that
seemed to charge them individually, but I can't find this anywhere
anymore (not at WalMart or Target).
Thanks,
Michael
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Author: LuhanDate: 13:41 29-12-06
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mrdarrett@gmail.com wrote:
> 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 batteries on the fritz, and I'd like to take care of
> them as much as possible. Dad had a Ray-o-Vac battery charger that
> seemed to charge them individually, but I can't find this anywhere
> anymore (not at WalMart or Target).
I've got the Eveready 15 minute charger. I roasts each battery
individually.
Luhan
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Author: martin griffithDate: 13:43 29-12-06
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On 29 Dec 2006 10:29:48 -0800, in sci.electronics.design
mrdarrett@gmail.com wrote:
>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 batteries on the fritz, and I'd like to take care of
>them as much as possible. Dad had a Ray-o-Vac battery charger that
>seemed to charge them individually, but I can't find this anywhere
>anymore (not at WalMart or Target).
>
>Thanks,
>
>Michael
I always start here
http://linear.com/pc/viewCategory.do?navId=H0,C1,C1003,C1037
good appnotes as well
martin
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Luhan wrote:
> mrdarrett@gmail.com wrote:
> > 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 batteries on the fritz, and I'd like to take care of
> > them as much as possible. Dad had a Ray-o-Vac battery charger that
> > seemed to charge them individually, but I can't find this anywhere
> > anymore (not at WalMart or Target).
>
> I've got the Eveready 15 minute charger. I roasts each battery
> individually.
>
> Luhan
Roasts? Is this a good thing, or a bad thing?
I always thought that fast chargers don't charge as well as the slow
chargers. Is this correct?
Michael
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Author: LuhanDate: 13:58 29-12-06
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mrdarrett@gmail.com wrote:
> Luhan wrote:
> > mrdarrett@gmail.com wrote:
> > > 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 batteries on the fritz, and I'd like to take care of
> > > them as much as possible. Dad had a Ray-o-Vac battery charger that
> > > seemed to charge them individually, but I can't find this anywhere
> > > anymore (not at WalMart or Target).
> >
> > I've got the Eveready 15 minute charger. I roasts each battery
> > individually.
> >
> > Luhan
>
>
>
> Roasts? Is this a good thing, or a bad thing?
>
> I always thought that fast chargers don't charge as well as the slow
> chargers. Is this correct?
I suspect damage to some of the batteries. They seem to lose charge
very quickly. I think a 1 hour charge (the 1 C rate) would be best. I
have one of my own design but its about a 10 hour charge.
http://members.cox.net/berniekm/charger.html
Luhan
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martin griffith wrote:
> On 29 Dec 2006 10:29:48 -0800, in sci.electronics.design
> mrdarrett@gmail.com wrote:
>
> >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 batteries on the fritz, and I'd like to take care of
> >them as much as possible. Dad had a Ray-o-Vac battery charger that
> >seemed to charge them individually, but I can't find this anywhere
> >anymore (not at WalMart or Target).
> >
> >Thanks,
> >
> >Michael
> I always start here
> http://linear.com/pc/viewCategory.do?navId=H0,C1,C1003,C1037
> good appnotes as well
>
>
> martin
Thanks... (Mouser doesn't carry an LTC4060??)
Michael
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Author: martin griffithDate: 14:06 29-12-06
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On 29 Dec 2006 11:03:21 -0800, in sci.electronics.design
mrdarrett@gmail.com wrote:
>
>martin griffith wrote:
>> On 29 Dec 2006 10:29:48 -0800, in sci.electronics.design
>> mrdarrett@gmail.com wrote:
>>
>> >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 batteries on the fritz, and I'd like to take care of
>> >them as much as possible. Dad had a Ray-o-Vac battery charger that
>> >seemed to charge them individually, but I can't find this anywhere
>> >anymore (not at WalMart or Target).
>> >
>> >Thanks,
>> >
>> >Michael
>> I always start here
>> http://linear.com/pc/viewCategory.do?navId=H0,C1,C1003,C1037
>> good appnotes as well
>>
>>
>> martin
>
>
>Thanks... (Mouser doesn't carry an LTC4060??)
>
>Michael
I'm in spain, so I don't use Mouser
martin
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martin griffith wrote:
> On 29 Dec 2006 11:03:21 -0800, in sci.electronics.design
> mrdarrett@gmail.com wrote:
>
> >
> >martin griffith wrote:
> >> On 29 Dec 2006 10:29:48 -0800, in sci.electronics.design
> >> mrdarrett@gmail.com wrote:
> >>
> >> >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 batteries on the fritz, and I'd like to take care
of
> >> >them as much as possible. Dad had a Ray-o-Vac battery charger that
> >> >seemed to charge them individually, but I can't find this anywhere
> >> >anymore (not at WalMart or Target).
> >> >
> >> >Thanks,
> >> >
> >> >Michael
> >> I always start here
> >> http://linear.com/pc/viewCategory.do?navId=H0,C1,C1003,C1037
> >> good appnotes as well
> >>
> >>
> >> martin
> >
> >
> >Thanks... (Mouser doesn't carry an LTC4060??)
> >
> >Michael
> I'm in spain, so I don't use Mouser
>
>
> martin
Are you really? Just yesterday my co-workers and I treated our
contractor (who is leaving) to lunch of his choice: he chose a Basque
restaurant. (It was in Chino somewhere, east of Los Angeles.) Very
interesting.
Unfortunately, I had a cold, and couldn't really taste anything. I
just had the soup.
Michael
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Author: martin griffithDate: 15:16 29-12-06
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On 29 Dec 2006 11:28:17 -0800, in sci.electronics.design
mrdarrett@gmail.com wrote:
>
>martin griffith wrote:
>> On 29 Dec 2006 11:03:21 -0800, in sci.electronics.design
>> mrdarrett@gmail.com wrote:
>>
>> >
>> >martin griffith wrote:
>> >> On 29 Dec 2006 10:29:48 -0800, in sci.electronics.design
>> >> mrdarrett@gmail.com wrote:
>> >>
>> >> >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 batteries on the fritz, and I'd like to take
care of
>> >> >them as much as possible. Dad had a Ray-o-Vac battery charger
that
>> >> >seemed to charge them individually, but I can't find this anywhere
>> >> >anymore (not at WalMart or Target).
>> >> >
>> >> >Thanks,
>> >> >
>> >> >Michael
>> >> I always start here
>> >> http://linear.com/pc/viewCategory.do?navId=H0,C1,C1003,C1037
>> >> good appnotes as well
>> >>
>> >>
>> >> martin
>> >
>> >
>> >Thanks... (Mouser doesn't carry an LTC4060??)
>> >
>> >Michael
>> I'm in spain, so I don't use Mouser
>>
>>
>> martin
>
>
>
>Are you really? Just yesterday my co-workers and I treated our
>contractor (who is leaving) to lunch of his choice: he chose a Basque
>restaurant. (It was in Chino somewhere, east of Los Angeles.) Very
>interesting.
>
>Unfortunately, I had a cold, and couldn't really taste anything. I
>just had the soup.
>
>Michael
>> I'm in spain, so I don't use Mouser
Yep, but the wiring shop I (ab)use, in the UK gets samples from the
local Linear office, they are quite helpful, and
http://linear.com/purchase/index.jsp
so you can purchase online, but I havent used that, I'm still a
Luddite when it means giving my financial info over the Tubes.
The Spanish around here,generally refuse to use credit/debit cards,
very much a cash economy, even buying my car was cash
martin
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martin griffith wrote:
> On 29 Dec 2006 11:28:17 -0800, in sci.electronics.design
> mrdarrett@gmail.com wrote:
>
> >
> >martin griffith wrote:
> >> On 29 Dec 2006 11:03:21 -0800, in sci.electronics.design
> >> mrdarrett@gmail.com wrote:
> >>
> >> >
> >> >martin griffith wrote:
> >> >> On 29 Dec 2006 10:29:48 -0800, in sci.electronics.design
> >> >> mrdarrett@gmail.com wrote:
> >> >>
> >> >> >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 batteries on the fritz, and I'd like to
take care of
> >> >> >them as much as possible. Dad had a Ray-o-Vac battery
charger that
> >> >> >seemed to charge them individually, but I can't find this
anywhere
> >> >> >anymore (not at WalMart or Target).
> >> >> >
> >> >> >Thanks,
> >> >> >
> >> >> >Michael
> >> >> I always start here
> >> >> http://linear.com/pc/viewCategory.do?navId=H0,C1,C1003,C1037
> >> >> good appnotes as well
> >> >>
> >> >>
> >> >> martin
> >> >
> >> >
> >> >Thanks... (Mouser doesn't carry an LTC4060??)
> >> >
> >> >Michael
> >> I'm in spain, so I don't use Mouser
> >>
> >>
> >> martin
> >
> >
> >
> >Are you really? Just yesterday my co-workers and I treated our
> >contractor (who is leaving) to lunch of his choice: he chose a Basque
> >restaurant. (It was in Chino somewhere, east of Los Angeles.) Very
> >interesting.
> >
> >Unfortunately, I had a cold, and couldn't really taste anything. I
> >just had the soup.
> >
> >Michael
>
>
> >> I'm in spain, so I don't use Mouser
> Yep, but the wiring shop I (ab)use, in the UK gets samples from the
> local Linear office, they are quite helpful, and
>
> http://linear.com/purchase/index.jsp
>
> so you can purchase online, but I havent used that, I'm still a
> Luddite when it means giving my financial info over the Tubes.
> The Spanish around here,generally refuse to use credit/debit cards,
> very much a cash economy, even buying my car was cash
>
>
> martin
Yep, even here, when buying a car from an individual, s/he wants cash
or a cashier's check. (Not even a personal check, from my ~limited~
experience.)
Buying from the car dealer is a little more accommodating. (Plus, the
dealership wants to trap you into paying high interest rates on their
preferred car loans. ;-)
Michael
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Author: martin griffithDate: 17:20 29-12-06
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On 29 Dec 2006 13:55:03 -0800, in sci.electronics.design
mrdarrett@gmail.com wrote:
chomp
>> >> I'm in spain, so I don't use Mouser
>> >>
>> >>
>> >> martin
>> >
>> >
>> >
>> >Are you really? Just yesterday my co-workers and I treated our
>> >contractor (who is leaving) to lunch of his choice: he chose a Basque
>> >restaurant. (It was in Chino somewhere, east of Los Angeles.) Very
>> >interesting.
>> >
>> >Unfortunately, I had a cold, and couldn't really taste anything. I
>> >just had the soup.
>> >
>> >Michael
>>
>>
>> >> I'm in spain, so I don't use Mouser
>> Yep, but the wiring shop I (ab)use, in the UK gets samples from the
>> local Linear office, they are quite helpful, and
>>
>> http://linear.com/purchase/index.jsp
>>
>> so you can purchase online, but I havent used that, I'm still a
>> Luddite when it means giving my financial info over the Tubes.
>> The Spanish around here,generally refuse to use credit/debit cards,
>> very much a cash economy, even buying my car was cash
>>
>>
>> martin
>
>
>Yep, even here, when buying a car from an individual, s/he wants cash
>or a cashier's check. (Not even a personal check, from my ~limited~
>experience.)
>
>Buying from the car dealer is a little more accommodating. (Plus, the
>dealership wants to trap you into paying high interest rates on their
>preferred car loans. ;-)
>
>Michael
Argh, this was a dealer.......cash,
BTW where are you? I assume somewhere in the US, since you said
"mouser"
martin
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martin griffith wrote:
> On 29 Dec 2006 13:55:03 -0800, in sci.electronics.design
> mrdarrett@gmail.com wrote:
>
> chomp
> >> >> I'm in spain, so I don't use Mouser
> >> >>
> >> >>
> >> >> martin
> >> >
> >> >
> >> >
> >> >Are you really? Just yesterday my co-workers and I treated our
> >> >contractor (who is leaving) to lunch of his choice: he chose a Basque
> >> >restaurant. (It was in Chino somewhere, east of Los Angeles.) Very
> >> >interesting.
> >> >
> >> >Unfortunately, I had a cold, and couldn't really taste anything. I
> >> >just had the soup.
> >> >
> >> >Michael
> >>
> >>
> >> >> I'm in spain, so I don't use Mouser
> >> Yep, but the wiring shop I (ab)use, in the UK gets samples from the
> >> local Linear office, they are quite helpful, and
> >>
> >> http://linear.com/purchase/index.jsp
> >>
> >> so you can purchase online, but I havent used that, I'm still a
> >> Luddite when it means giving my financial info over the Tubes.
> >> The Spanish around here,generally refuse to use credit/debit cards,
> >> very much a cash economy, even buying my car was cash
> >>
> >>
> >> martin
> >
> >
> >Yep, even here, when buying a car from an individual, s/he wants cash
> >or a cashier's check. (Not even a personal check, from my ~limited~
> >experience.)
> >
> >Buying from the car dealer is a little more accommodating. (Plus, the
> >dealership wants to trap you into paying high interest rates on their
> >preferred car loans. ;-)
> >
> >Michael
> Argh, this was a dealer.......cash,
>
> BTW where are you? I assume somewhere in the US, since you said
> "mouser"
>
>
> martin
I'm in Sacramento (California), but about twice a month have to fly
into Ontario (near Los Angeles, not the one in Canada) for work.
Man, the turbulence on yesterday morning's flight to Ontario was the
worst I've ever been in. Thought the plane was going to crash for
sure. The plane was flying sideways...
Michael
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Author: linnixDate: 18:50 29-12-06
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mrdarrett@gmail.com wrote:
> Luhan wrote:
> > mrdarrett@gmail.com wrote:
> > > 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 batteries on the fritz, and I'd like to take care of
> > > them as much as possible. Dad had a Ray-o-Vac battery charger that
> > > seemed to charge them individually, but I can't find this anywhere
> > > anymore (not at WalMart or Target).
> >
> > I've got the Eveready 15 minute charger. I roasts each battery
> > individually.
> >
> > Luhan
>
>
>
> Roasts? Is this a good thing, or a bad thing?
>
> I always thought that fast chargers don't charge as well as the slow
> chargers. Is this correct?
Battery manufacturers seem to disagree with you. They recommend 1C
fast chargers for NiMH.
>
> Michael
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linnix wrote:
> mrdarrett@gmail.com wrote:
> > Luhan wrote:
> > > mrdarrett@gmail.com wrote:
> > > > 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 batteries on the fritz, and I'd like to take care
of
> > > > them as much as possible. Dad had a Ray-o-Vac battery charger that
> > > > seemed to charge them individually, but I can't find this anywhere
> > > > anymore (not at WalMart or Target).
> > >
> > > I've got the Eveready 15 minute charger. I roasts each battery
> > > individually.
> > >
> > > Luhan
> >
> >
> >
> > Roasts? Is this a good thing, or a bad thing?
> >
> > I always thought that fast chargers don't charge as well as the slow
> > chargers. Is this correct?
>
> Battery manufacturers seem to disagree with you. They recommend 1C
> fast chargers for NiMH.
Do they? Reference, please?
Here's what I found:
http://www.greenbatteries.com/bachfa.html#Rapid%20charging
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Author: linnixDate: 19:32 29-12-06
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mrdarrett@gmail.com wrote:
> linnix wrote:
> > mrdarrett@gmail.com wrote:
> > > Luhan wrote:
> > > > mrdarrett@gmail.com wrote:
> > > > > 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 batteries on the fritz, and I'd like to take
care of
> > > > > them as much as possible. Dad had a Ray-o-Vac battery charger
that
> > > > > seemed to charge them individually, but I can't find this
anywhere
> > > > > anymore (not at WalMart or Target).
> > > >
> > > > I've got the Eveready 15 minute charger. I roasts each battery
> > > > individually.
> > > >
> > > > Luhan
> > >
> > >
> > >
> > > Roasts? Is this a good thing, or a bad thing?
> > >
> > > I always thought that fast chargers don't charge as well as the slow
> > > chargers. Is this correct?
> >
> > Battery manufacturers seem to disagree with you. They recommend 1C
> > fast chargers for NiMH.
>
>
> Do they? Reference, please?
The issue is with proper charging termination. NiMH can be damaged
without proper charging termination. At 0.1C, the temperature delta is
1 to 2 degrees. At 1C, the temperature delta is 10 to 15 degrees.
It's a lot easier to detect full charging at 1C.
>
> Here's what I found:
> http://www.greenbatteries.com/bachfa.html#Rapid%20charging
They don't really tell you why.
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Author: jasenDate: 21:44 29-12-06
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["Followup-To:" header set to sci.electronics.basics.]
On 2006-12-29, mrdarrett@gmail.com <mrdarrett@gmail.com> wrote:
> I've got some NiMH batteries on the fritz, and I'd like to take care of
> them as much as possible. Dad had a Ray-o-Vac battery charger that
> seemed to charge them individually, but I can't find this anywhere
> anymore (not at WalMart or Target).
http://jaycar.co.nz/productResults.asp?FORM=KEYWORD&keywords=mb3537
Probably available at a better price, with a plug the right shape, and
closer to you too.
Bye.
Jasen
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Author: jasenDate: 21:54 29-12-06
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On 2006-12-29, martin griffith <mart_in_medina@ya___.es> wrote:
> I'm in spain, so I don't use Mouser
LOL! what I said about closer to you is definately right then...
seing as I'm about 43S 172E and spain's around 40N 5W
give farnell.co.uk or maplin.co.uk a look.
Bye.
Jasen
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Author: ehsjrDate: 22:07 29-12-06
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mrdarrett@gmail.com wrote:
> 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 batteries on the fritz, and I'd like to take care of
> them as much as possible. Dad had a Ray-o-Vac battery charger that
> seemed to charge them individually, but I can't find this anywhere
> anymore (not at WalMart or Target).
>
> Thanks,
>
> Michael
>
This will do a single cell:
-----
+5 ----Vin|LM317|Vout---+
----- |
Adj [R]
| |
+----------+
|
[NiMh]
|
Gnd ----------------------+
I = C/50 forever; I = C/10 for 14 hour rate.
If using 14 hour rate, you could use a 24 hour
appliance timer like Intermatic TN111C
R = 1.25/I
Ed
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ehsjr wrote:
> mrdarrett@gmail.com wrote:
> > 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 batteries on the fritz, and I'd like to take care of
> > them as much as possible. Dad had a Ray-o-Vac battery charger that
> > seemed to charge them individually, but I can't find this anywhere
> > anymore (not at WalMart or Target).
> >
> > Thanks,
> >
> > Michael
> >
>
> This will do a single cell:
>
> -----
> +5 ----Vin|LM317|Vout---+
> ----- |
> Adj [R]
> | |
> +----------+
> |
> [NiMh]
> |
> Gnd ----------------------+
>
> I = C/50 forever; I = C/10 for 14 hour rate.
> If using 14 hour rate, you could use a 24 hour
> appliance timer like Intermatic TN111C
>
> R = 1.25/I
>
> Ed
But, what if the battery wasn't completely discharged? Say, 50% or 70%
charged? Then this (and all timer-based chargers) could overcharge it,
right?
Thanks,
Michael
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Author: Michael A. TerrellDate: 20:37 30-12-06
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martin griffith wrote:
>
> I'm in spain, so I don't use Mouser.
You dont have any cats in Spain?
--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.
Michael A. Terrell
Central Florida
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