Can a 12VDC 500ma wall wart trickle charge a car battery?...

J

John

Guest
Can a 12VDC 500ma wall wart trickle charge a car battery or must the voltage
to charge a car battery be greater than 12VDC (like 14 or 15 volts?).

Can a well regulated 12VDC still charge (over a long time) a car battery?

Or must it be over 13.5 volts to (eventually) accomplish full charging?
 
On Tuesday, August 3, 2021 at 2:34:59 AM UTC-4, Jeff Liebermann wrote:
On Mon, 2 Aug 2021 10:44:14 -0700 (PDT), \"Peter W.\"
peterw...@gmail.com> wrote:

it\'s not all that easy to find an American made tool.

Agreed. But the internet is your friend.
https://www.dewalt.com/products/power-tools/products-made-in-the-usa
https://www.protoolreviews.com/what-tools-are-made-in-the-usa/
https://www.toolbarn.com/usa-made-tools/
Are three sources of many.
Careful. \"Made in the USA\" is actually \"Select Products Made in the
USA with Global Materials\". That\'s exactly what the DeWalt page
shows. It\'s much the same with most other large tool vendors. The
standard joke is that the tools are made in China or elsewhere, but
the stick on labels are attached in the USA. Some of the former large
warehouses have been converted into \"factories\" where the \"production
line\" adds labels, assembles kits, adds legal documents, and stuffs
them in cardboard boxes. A major clue is that these \"factories\" have
very few employees compared to the square footage.

Do you remember back in the \'60s when consumer electronics were often labeled with the percentage of foreign made parts? I remember cheap TVs with Japanese built TV tuners that would melt or crumble because they used polystyrene instead of fiber or ceramic insulators. Once one needed cleaning, they were often scraped because no replacements were available.

Even if something is assembled in the USA, it often has no US made components since the US companies were sold to overseas interests who closed the US facilities. Sprague was one of the early losses, in the \'90s. A place that I worked sold off the remaining production equipment. It is now part of Vishay, along with a lot of other, former US suppliers and nothing is made on shore.
Some friends of mine manufacture high quality canopies for art shows. Every company that made the required heavy vinyl they used has moved off shore. Instead of being able to call a US OEM for a couple rolls a month, they have to buy the rolls by the pallet load, and wait months instead of days for delivery. This of course got them bounced off all the \'Made in the USA lists even though they make every part from raw materials.
 
On 9/6/2021 1:17 AM, Michael Terrell wrote:
On Tuesday, August 3, 2021 at 2:34:59 AM UTC-4, Jeff Liebermann wrote:
On Mon, 2 Aug 2021 10:44:14 -0700 (PDT), \"Peter W.\"
peterw...@gmail.com> wrote:

it\'s not all that easy to find an American made tool.

Agreed. But the internet is your friend.
https://www.dewalt.com/products/power-tools/products-made-in-the-usa
https://www.protoolreviews.com/what-tools-are-made-in-the-usa/
https://www.toolbarn.com/usa-made-tools/
Are three sources of many.
Careful. \"Made in the USA\" is actually \"Select Products Made in the
USA with Global Materials\". That\'s exactly what the DeWalt page
shows. It\'s much the same with most other large tool vendors. The
standard joke is that the tools are made in China or elsewhere, but
the stick on labels are attached in the USA. Some of the former large
warehouses have been converted into \"factories\" where the \"production
line\" adds labels, assembles kits, adds legal documents, and stuffs
them in cardboard boxes. A major clue is that these \"factories\" have
very few employees compared to the square footage.

Do you remember back in the \'60s when consumer electronics were often labeled with the percentage of foreign made parts? I remember cheap TVs with Japanese built TV tuners that would melt or crumble because they used polystyrene instead of fiber or ceramic insulators. Once one needed cleaning, they were often scraped because no replacements were available.

Even if something is assembled in the USA, it often has no US made components since the US companies were sold to overseas interests who closed the US facilities. Sprague was one of the early losses, in the \'90s. A place that I worked sold off the remaining production equipment. It is now part of Vishay, along with a lot of other, former US suppliers and nothing is made on shore.
Some friends of mine manufacture high quality canopies for art shows. Every company that made the required heavy vinyl they used has moved off shore. Instead of being able to call a US OEM for a couple rolls a month, they have to buy the rolls by the pallet load, and wait months instead of days for delivery. This of course got them bounced off all the \'Made in the USA lists even though they make every part from raw materials.

Back in the late 70\'s I worked at a commercial cooking product company.

We (the company) decided to design their own fryer timer, instead of
buying them.

So, as part of the \"Made in the USA\" initiative, we searched and sorted
and found optoisolators (4N35s to be precise) that were made and sold by
GE, being an American company. The others that would do what we needed
were made by Toshiba and Sony.

So we get our 4N35s in. All stamped \"Made in Yugoslavia\". In 1978.

RwP
 
On Monday, September 6, 2021 at 12:09:53 PM UTC-4, Ralph Phillips wrote: >
Back in the late 70\'s I worked at a commercial cooking product company.

We (the company) decided to design their own fryer timer, instead of
buying them.

So, as part of the \"Made in the USA\" initiative, we searched and sorted
and found optoisolators (4N35s to be precise) that were made and sold by
GE, being an American company. The others that would do what we needed
were made by Toshiba and Sony.

So we get our 4N35s in. All stamped \"Made in Yugoslavia\". In 1978.

The first TTL ICs that I purchased for a project in 1971 They were branded Texas Instruments and from Pioneer Electronics, a wholesale industrial suppler in SW Ohio. $7 each for 7447 display drivers, and they were made in Malaysia.
 
On Sun, 5 Sep 2021 23:17:47 -0700 (PDT), Michael Terrell
<terrell.michael.a@gmail.com> wrote:

>Do you remember back in the \'60s when consumer electronics were often labeled with the percentage of foreign made parts?

Actually, no. During the 60\'s, I was doing warranty repair service on
imported hi-fi and audio hardware, so I wouldn\'t have seen any such
labels. If there were such labels, they would probably say something
like \"100% foreign components\".

>I remember cheap TVs with Japanese built TV tuners that would melt or crumble because they used polystyrene instead of fiber or ceramic insulators. Once one needed cleaning, they were often scraped because no replacements were available.

That\'s still the situation, at least in the personal computah sector.
Components are selected to self destruct just after the warranty
expires. It\'s easy to build a \"warranty timer\" using electrolytic
capacitors:
<https://www.illinoiscapacitor.com/tech-center/life-calculators.aspx>
<https://eepower.com/tools/electrolytic-capacitor-life-calculator/>
<https://www.nichicon.co.jp/english/products/lifetime/>
<https://www.nichicon.co.jp/english/products/lifetime/ripple.html>
It was quite common for me to see a monitor or PCB with a huge
percentage of the electrolytics that tested bad on an ESR tester, or
which have the tops blown out caused by overheating from excessive
ripple current.

I\'ll leave out my customary \"Right to Repair\" rant.

>Even if something is assembled in the USA, it often has no US made components since the US companies were sold to overseas interests who closed the US facilities. Sprague was one of the early losses, in the \'90s. A place that I worked sold off the remaining production equipment. It is now part of Vishay, along with a lot of other, former US suppliers and nothing is made on shore.

Yep. That trend continues. Try finding a \"white goods\" appliance
made in the USA at any price. They actually do exist, but only for
higher cost industrial purposes. The current transition from
Craftsman tools from mostly US made to foreign ownership and
manufacture is accompanied by a general lack of quality workmanship
and finishing. The sticker doesn\'t say \"Made in USA\". It says \"Made
in USA from global materials\" which is effectively an oxymoron and
means nothing. Today, there are very few hand tool manufacturers that
actually make their tools in the USA.

Hair splitting:
<https://ell.stackexchange.com/questions/52129/made-in-usa-vs-made-in-the-usa>

When I worked for a US marine radio manufacturer in the 1970\'s, I once
priced out the US 1K quantity component cost for a competing radio
from Japan. No labor, test, QA, manuals, shipping boxes, overhead,
etc. Just the components and major mechanical parts. The total parts
cost was about 7 times the wholesale selling price of the Made in
Japan radios. If I added my guess for the items I omitted, double
that.

>Some friends of mine manufacture high quality canopies for art shows. Every company that made the required heavy vinyl they used has moved off shore. Instead of being able to call a US OEM for a couple rolls a month, they have to buy the rolls by the pallet load, and wait months instead of days for delivery. This of course got them bounced off all the \'Made in the USA lists even though they make every part from raw materials.

My father used own a factory that made lingerie. The same thing
happend to his suppliers of nylon net material.

It\'s a small step from importing just the components and materials
from an offshore vendor, to doing everything offshore. Today, US
consumers are benefiting from low cost overseas manufacturing costs.
As the standard of living in these formerly 3rd world countries
increases, the US standard of living will decrease proportionally
until everything evens out. There\'s a fair chance that the US might
end up a 3rd world country or as the worlds biggest customer.

In case you haven\'t noticed, most of the leading manufacturers of high
tech consumer electronics are doing everything possible to reduce the
useful life of their products. Much of what I see is barely adequate
for the intended purpose, unrepairable, but cheap enough for anyone on
stimulus payments or extended unemployment to afford.

Very fitting topic for Labor Day.

--
Jeff Liebermann jeffl@cruzio.com
PO Box 272 http://www.LearnByDestroying.com
Ben Lomond CA 95005-0272
Skype: JeffLiebermann AE6KS 831-336-2558
 
Ralph Phillips wrote:
==================

So, as part of the \"Made in the USA\" initiative, we searched and sorted
and found optoisolators (4N35s to be precise) that were made and sold by
GE, being an American company. The others that would do what we needed
were made by Toshiba and Sony.

So we get our 4N35s in. All stamped \"Made in Yugoslavia\". In 1978.

** If you check it out - the main motive for shifting semiconductor fabrication off to impoverished places like that was to avoid health and safety regulations in the USA. They were too expensive to comply with.

Life was cheap in Yugoslavia.

...... Phil
 
On Monday, August 2, 2021 at 1:21:24 PM UTC-4, Jeff Liebermann wrote:
On Sun, 1 Aug 2021 19:27:45 +0200, John <jo...@nospam.invalid> wrote:

Can a 12VDC 500ma wall wart trickle charge a car battery or must the voltage
to charge a car battery be greater than 12VDC (like 14 or 15 volts?).

Can a well regulated 12VDC still charge (over a long time) a car battery?

Or must it be over 13.5 volts to (eventually) accomplish full charging?
Lots of things wrong here:
snip.......
5. Today\'s overpriced car batteries cost about $100. Would you
really risk trashing a $100 battery because you don\'t want to use a
proper battery charger? I wouldn\'t. Unfortunately, a charger with a
fancy label is not a guarantee of quality. All these chargers were
defective in some manner. They also killed two rather expensive
stationary batteries at a radio site:
http://www.learnbydestroying.com/jeffl/pics/drivel/dead-battery-chargers..jpg
Spend some time and do some reading on chargers.
snip
Good luck.


--
Jeff Liebermann je...@cruzio.com
PO Box 272 http://www.LearnByDestroying.com
Ben Lomond CA 95005-0272
Skype: JeffLiebermann AE6KS 831-336-2558

Automobile batteries must cost less in LHS USA than in RHS. I recently got a car battery for my 2004 Saab 9-5, at $150 from Walmart ( made by Johnson Controls). The AGM one for a 2016 Volvo was $200. One for the 2004 Grand Cherokee was $160. All were purchases within the last six months. I keep an eye out for sales and these prices are not regular retail. Three to four years ago each battery would have been about $30-$40 USD less (not sure about the AGM as these seem to be hyped as the new&better battery tech). Guess it is another symptom of the blame it on covid money grab.
Even more reason not to kill a battery with an inappropriate charger.
J
 
On Monday, August 2, 2021 at 1:21:24 PM UTC-4, Jeff Liebermann wrote:
On Sun, 1 Aug 2021 19:27:45 +0200, John <jo...@nospam.invalid> wrote:

Can a 12VDC 500ma wall wart trickle charge a car battery or must the voltage
to charge a car battery be greater than 12VDC (like 14 or 15 volts?).

Can a well regulated 12VDC still charge (over a long time) a car battery?

Or must it be over 13.5 volts to (eventually) accomplish full charging?
Lots of things wrong here:
snip.......
5. Today\'s overpriced car batteries cost about $100. Would you
really risk trashing a $100 battery because you don\'t want to use a
proper battery charger? I wouldn\'t. Unfortunately, a charger with a
fancy label is not a guarantee of quality. All these chargers were
defective in some manner. They also killed two rather expensive
stationary batteries at a radio site:
http://www.learnbydestroying.com/jeffl/pics/drivel/dead-battery-chargers..jpg
Spend some time and do some reading on chargers.
snip
Good luck.


--
Jeff Liebermann je...@cruzio.com
PO Box 272 http://www.LearnByDestroying.com
Ben Lomond CA 95005-0272
Skype: JeffLiebermann AE6KS 831-336-2558

Automobile batteries must cost less in LHS USA than in RHS. I recently got a car battery for my 2004 Saab 9-5, at $150 from Walmart ( made by Johnson Controls). The AGM one for a 2016 Volvo was $200. One for the 2004 Grand Cherokee was $160. All were purchases within the last six months. I keep an eye out for sales and these prices are not regular retail. Three to four years ago each battery would have been about $30-$40 USD less (not sure about the AGM as these seem to be hyped as the new&better battery tech). Guess it is another symptom of the blame it on covid money grab.
Even more reason not to kill a battery with an inappropriate charger.
J
 
Le 01/08/2021 à 19:36, Ralph Mowery a écrit :
In article <se6li2$is8$1@gioia.aioe.org>, john@nospam.invalid says...

Can a 12VDC 500ma wall wart trickle charge a car battery or must the voltage
to charge a car battery be greater than 12VDC (like 14 or 15 volts?).

Can a well regulated 12VDC still charge (over a long time) a car battery?

Or must it be over 13.5 volts to (eventually) accomplish full charging?



Unless they are regulated many of the 12 volt wall warts put out over 12
volts. It may not charge a car battery very much if it is one of the
unregulated ones ,but will maintain the charge.

A well regulated 12 volt supply will not charge a car battery as it 12.6
volts when charged.

It will take a higher voltage than 13 volts to charge a car battery.

Unless precautions are taken just hooking a power supply to a car
battery could damage the power supply especially if it is a regulated
one.
Using something not designed for to charge batteries is a bad idea.
Leaving it connected his way for weeks is worse
The main reason is that there is no protection against the load feeding
back power and eventually starting a fire.
I think using a timer on a normal charger to limit it to a few
minutes/hours per week is much better.
 
In article <se6li2$is8$1@gioia.aioe.org>, john@nospam.invalid says...
Can a 12VDC 500ma wall wart trickle charge a car battery or must the voltage
to charge a car battery be greater than 12VDC (like 14 or 15 volts?).

Can a well regulated 12VDC still charge (over a long time) a car battery?

Or must it be over 13.5 volts to (eventually) accomplish full charging?

Unless they are regulated many of the 12 volt wall warts put out over 12
volts. It may not charge a car battery very much if it is one of the
unregulated ones ,but will maintain the charge.

A well regulated 12 volt supply will not charge a car battery as it 12.6
volts when charged.

It will take a higher voltage than 13 volts to charge a car battery.

Unless precautions are taken just hooking a power supply to a car
battery could damage the power supply especially if it is a regulated
one.
 
On 8/1/2021 12:36 PM, Ralph Mowery wrote:
In article <se6li2$is8$1@gioia.aioe.org>, john@nospam.invalid says...
Can a 12VDC 500ma wall wart trickle charge a car battery or must the voltage
to charge a car battery be greater than 12VDC (like 14 or 15 volts?).

Can a well regulated 12VDC still charge (over a long time) a car battery?

Or must it be over 13.5 volts to (eventually) accomplish full charging?


Unless they are regulated many of the 12 volt wall warts put out over 12
volts. It may not charge a car battery very much if it is one of the
unregulated ones ,but will maintain the charge.

A well regulated 12 volt supply will not charge a car battery as it 12.6
volts when charged.

It will take a higher voltage than 13 volts to charge a car battery.

Unless precautions are taken just hooking a power supply to a car
battery could damage the power supply especially if it is a regulated
one.
I did a short search hoping to find what current flows during trickle
charge. I was surprised to see 1 to 3 amps.

 This is supposed to match the self discharge rate.

Going by that, I doubt you could damage your battery with a 500ma wall wart.

There are different types of wall warts, regulated and unregulated. What
kind do you have?

If you have an unregulated type, measure the unloaded

voltage. say it is 15V and, guessing here, it is 12V when delivering
500ma. So it has an output impedance of 6 ohms.

If it delivered 100ma the voltage would be 14.4 Volts. 15V - (6Ω x
0.1A)= 14.4V

To be safe I would float it at 13.6 meaning add in series a resistor.
15V - 13.6V = 1.4V  then 1.4V / 0.1A = 14 Ω

you already have 6Ω internal so add 8Ω more.  Now you have 15V -(14Ω x
0.1V) = 13.6V  The max it will deliver at

13.6V is 100ma. this will rise to 14.86 at 10ma. But if the Self
discharge rate is higher (as suggested) your charge voltage will never
get that high.

 If you want to learn something do this, if you just want to keep the
battery charged go to Harbor Freight.

                                        Mikek

If you have an unregulated style, I\'d experiment, if not spend $9 at
Harbor Freight and get one.

                                                         Mikek



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On 8/1/2021 12:36 PM, Ralph Mowery wrote:
In article <se6li2$is8$1@gioia.aioe.org>, john@nospam.invalid says...
Can a 12VDC 500ma wall wart trickle charge a car battery or must the voltage
to charge a car battery be greater than 12VDC (like 14 or 15 volts?).

Can a well regulated 12VDC still charge (over a long time) a car battery?

Or must it be over 13.5 volts to (eventually) accomplish full charging?


Unless they are regulated many of the 12 volt wall warts put out over 12
volts. It may not charge a car battery very much if it is one of the
unregulated ones ,but will maintain the charge.

A well regulated 12 volt supply will not charge a car battery as it 12.6
volts when charged.

It will take a higher voltage than 13 volts to charge a car battery.

Unless precautions are taken just hooking a power supply to a car
battery could damage the power supply especially if it is a regulated
one.
I did a short search hoping to find what current flows during trickle
charge. I was surprised to see 1 to 3 amps.

 This is supposed to match the self discharge rate.

Going by that, I doubt you could damage your battery with a 500ma wall wart.

There are different types of wall warts, regulated and unregulated. What
kind do you have?

If you have an unregulated type, measure the unloaded

voltage. say it is 15V and, guessing here, it is 12V when delivering
500ma. So it has an output impedance of 6 ohms.

If it delivered 100ma the voltage would be 14.4 Volts. 15V - (6Ω x
0.1A)= 14.4V

To be safe I would float it at 13.6 meaning add in series a resistor.
15V - 13.6V = 1.4V  then 1.4V / 0.1A = 14 Ω

you already have 6Ω internal so add 8Ω more.  Now you have 15V -(14Ω x
0.1V) = 13.6V  The max it will deliver at

13.6V is 100ma. this will rise to 14.86 at 10ma. But if the Self
discharge rate is higher (as suggested) your charge voltage will never
get that high.

 If you want to learn something do this, if you just want to keep the
battery charged go to Harbor Freight.

                                        Mikek

If you have an unregulated style, I\'d experiment, if not spend $9 at
Harbor Freight and get one.

                                                         Mikek



--
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus
 
Those who go to Harbor Freight deserve exactly what they get.

Peter Wieck
Melrose Park, PA
 
Those who go to Harbor Freight deserve exactly what they get.

Peter Wieck
Melrose Park, PA
 
On 8/1/2021 6:43 PM, Peter W. wrote:
Those who go to Harbor Freight deserve exactly what they get.

Peter Wieck
Melrose Park, PA

 You mean a usable tool or device at a low price.

I have a dial indicator I bought 4 or 5 years ago, great price, does
what I need, and I\'m not afraid

to use it to scribe a cut line, $9.99. I have a metal shear, it has done
every bend as expected. I use the

Bunker hill intruder alarm (93068, 69590, 62447, 61910) $10 or $11,
works well, I have even modified it

for special purposes. Neighbor bought a HF hammer drill, we both used it
during porch construction, I used one other time since.

It did the job, not something we need everyday, so why waste money.
Belt/disc sander, does everything I need. Wood clamps,

the work just fine.

 Things that didn\'t work a tiny air compressor, it fell apart, I got my
money back. I bought a HF drill press, it worked fine, had belt
adjustable speeds,

 what I didn\'t like was, it didn\'t have enough throw to drill the long
way through a 2\" x 4\". I did resell that and I\'m in the market for a 
new drill press.

I may get a floor model.

If you are in construction and use a tool daily, sure by higher quality,
but for the home owner that may use a

tool 5 minutes twice a year, I\'d rather have my money in the stock
market than in a quality tool I use twice a year.

                                      Mikek


--
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus
 
On 8/1/2021 6:43 PM, Peter W. wrote:
Those who go to Harbor Freight deserve exactly what they get.

Peter Wieck
Melrose Park, PA

 You mean a usable tool or device at a low price.

I have a dial indicator I bought 4 or 5 years ago, great price, does
what I need, and I\'m not afraid

to use it to scribe a cut line, $9.99. I have a metal shear, it has done
every bend as expected. I use the

Bunker hill intruder alarm (93068, 69590, 62447, 61910) $10 or $11,
works well, I have even modified it

for special purposes. Neighbor bought a HF hammer drill, we both used it
during porch construction, I used one other time since.

It did the job, not something we need everyday, so why waste money.
Belt/disc sander, does everything I need. Wood clamps,

the work just fine.

 Things that didn\'t work a tiny air compressor, it fell apart, I got my
money back. I bought a HF drill press, it worked fine, had belt
adjustable speeds,

 what I didn\'t like was, it didn\'t have enough throw to drill the long
way through a 2\" x 4\". I did resell that and I\'m in the market for a 
new drill press.

I may get a floor model.

If you are in construction and use a tool daily, sure by higher quality,
but for the home owner that may use a

tool 5 minutes twice a year, I\'d rather have my money in the stock
market than in a quality tool I use twice a year.

                                      Mikek


--
This email has been checked for viruses by Avast antivirus software.
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On 2/08/2021 6:29 am, amdx wrote:
On 8/1/2021 12:36 PM, Ralph Mowery wrote:
In article <se6li2$is8$1@gioia.aioe.org>, john@nospam.invalid says...
Can a 12VDC 500ma wall wart trickle charge a car battery or must the
voltage
to charge a car battery be greater than 12VDC (like 14 or 15 volts?).

Can a well regulated 12VDC still charge (over a long time) a car
battery?

Or must it be over 13.5 volts to (eventually) accomplish full charging?


Unless they are regulated many of the 12 volt wall warts put out over 12
volts.  It may not charge a car battery very much if it is one of the
unregulated ones ,but will maintain the charge.

A well regulated 12 volt supply will not charge a car battery as it 12.6
volts when charged.

It will take a higher voltage than 13 volts to charge a car battery.

Unless precautions are taken just hooking a power supply to a car
battery could damage the power supply especially if it is a regulated
one.


I did a short search hoping to find what current flows during trickle
charge. I was surprised to see 1 to 3 amps.

 This is supposed to match the self discharge rate.

Going by that, I doubt you could damage your battery with a 500ma wall
wart.

There are different types of wall warts, regulated and unregulated. What
kind do you have?

If you have an unregulated type, measure the unloaded

voltage. say it is 15V and, guessing here, it is 12V when delivering
500ma. So it has an output impedance of 6 ohms.

If it delivered 100ma the voltage would be 14.4 Volts. 15V - (6Ω x
0.1A)= 14.4V

To be safe I would float it at 13.6 meaning add in series a resistor.
15V - 13.6V = 1.4V  then 1.4V / 0.1A = 14 Ω

you already have 6Ω internal so add 8Ω more.  Now you have 15V -(14Ω x
0.1V) = 13.6V  The max it will deliver at

13.6V is 100ma. this will rise to 14.86 at 10ma. But if the Self
discharge rate is higher (as suggested) your charge voltage will never
get that high.

 If you want to learn something do this, if you just want to keep the
battery charged go to Harbor Freight.

                                        Mikek

If you have an unregulated style, I\'d experiment, if not spend $9 at
Harbor Freight and get one.

                                                         Mikek
What size battery needs 1 to 3amps for trickle charge ?
The average unit only needs around 300mA to maintain charge.
 
On 8/1/2021 7:43 PM, Peter W. wrote:
Those who go to Harbor Freight deserve exactly what they get.

Peter Wieck
Melrose Park, PA

It depends on what you need. I\'ve gotten great deals at HF. Others,
not so much.
 
On 8/1/2021 7:43 PM, Peter W. wrote:
Those who go to Harbor Freight deserve exactly what they get.

Peter Wieck
Melrose Park, PA

It depends on what you need. I\'ve gotten great deals at HF. Others,
not so much.
 
John wrote:
=================
Can a 12VDC 500ma wall wart trickle charge a car battery or must the voltage
to charge a car battery be greater than 12VDC (like 14 or 15 volts?).

** Yes.

Can a well regulated 12VDC still charge (over a long time) a car battery?

**No.

> Or must it be over 13.5 volts to (eventually) accomplish full charging?

** Yes.

......... Phil
 

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