9v Battery for 8N

equeen · Nov 11, 2012

Laugh if ya will; but I had to see with my own eyes. So, I took a WEE LITTLE 9v battery used in electronic devices around the house (smoke detector, etc) and took a voltage reading - using same meter and setting as used for checking the LARGE 6v battery on my tractor.

Yep, the wee little battery registered 9v.

Sooooooooo...I should be able to put the wee little 9v battery on my tractor instead of the large 6v battery - and I would have more voltage.

Hmmm? Must be something more than voltage that the tractor needs. Must be something very closely associated with that voltage.

Hmmm? Must be that amperage is vital. More amps certainly provides more starting power.

Without getting too technical, if possible, anyone want to explain amperage and its relationship to voltage?

Plane Bart · Nov 11, 2012

Amps is a measurement for Current flow
Think of it as a water hose the larger the hose the more flow same for wire size .14 AWG (American wire Gauge) is rated for 15 Amps, .10 AWG is rated for 30 amps.
In DC (Direct Current) batteries are rated by Voltage and CCA
(Cold Cranking Amps)
The CCA of a battery is how much current the battery in good condition will have available to turn the starter motor.
(Note batteries used for emergency lighting systems not in automotive use are rated in AH amp hours ) not related to tractors.

Bart Master Electrician

Plane Bart · Nov 11, 2012

Amps is a measurement for Current flow
Think of it as a water hose the larger the hose the more flow same for wire size .14 AWG (American wire Gauge) is rated for 15 Amps, .10 AWG is rated for 30 amps.
In DC (Direct Current) batteries are rated by Voltage and CCA
(Cold Cranking Amps)
The CCA of a battery is how much current the battery in good condition will have available to turn the starter motor.
(Note batteries used for emergency lighting systems not in automotive use are rated in AH amp hours ) not related to tractors.

Bart Master Electrician

JMOR · Nov 11, 2012

(quoted from post at 09:06:07 11/11/12) Laugh if ya will; but I had to see with my own eyes. So, I took a WEE LITTLE 9v battery used in electronic devices around the house (smoke detector, etc) and took a voltage reading - using same meter and setting as used for checking the LARGE 6v battery on my tractor.

Yep, the wee little battery registered 9v.

Sooooooooo...I should be able to put the wee little 9v battery on my tractor instead of the large 6v battery - and I would have more voltage.

Hmmm? Must be something more than voltage that the tractor needs. Must be something very closely associated with that voltage.

Hmmm? Must be that amperage is vital. More amps certainly provides more starting power.

Without getting too technical, if possible, anyone want to explain amperage and its relationship to voltage?

here are numerous analogies, but the following seems like one you can identify with: The spigot in your yard that you connect the garden hose to has the same static pressure as the fire hydrant at the street (same main water line/same water tower), lets call that pressure the voltage. Lets call the water flow gallons per minute (or amperage in analogy). One has a much greater capacity (GPM/amps) than the other. It is left to the reader to determine which is which.

ericlb · Nov 11, 2012

think of it like horsepower vs torque, hp is the voltage, torque is amps, amps is the ability to do the work, volts is the power available , another way, the little 9v battery is volts, similer to a garden hose, it can flow say 4 gallons per minute, the battery in your tractor is like a hose on a fire truck able to flow 500 gallons per minute it got more pressure behind it and a lot bigger diameter

JMOR · Nov 11, 2012

(quoted from post at 09:55:04 11/11/12) think of it like horsepower vs torque, hp is the voltage, torque is amps, amps is the ability to do the work, volts is the power available , another way, the little 9v battery is volts, similer to a garden hose, it can flow say 4 gallons per minute, the battery in your tractor is like a hose on a fire truck able to flow 500 gallons per minute it got more pressure behind it and a lot bigger diameter

ow you are going to confuse him! His 9v batt has greater "pressure" than his 6v tractor batt.

equeen · Nov 11, 2012

Sheesh, JMOR. I thought that the other folks had explained in a simple manner that I clearly understood.

But, now you say it's the "pressure". The other folks didn't say anything about a tire pressure guage. Are you really sure that you know what you're talking about?

Just wondering.

JMOR · Nov 11, 2012

(quoted from post at 13:57:22 11/11/12) Sheesh, JMOR. I thought that the other folks had explained in a simple manner that I clearly understood.

But, now you say it's the "pressure". The other folks didn't say anything about a tire pressure guage. Are you really sure that you know what you're talking about?

Just wondering.

ou be the only one to mention "tires". No, I don't know sheet from Shinola! :twisted:

teddy52food · Nov 11, 2012

The problem is that as soon as you put a load on that 9v battery, the voltage will drop down to almost nothing.

Jock(OR) · Nov 11, 2012

JMOR is on the right track in explaining voltage/amperage with his water analogy, but I will take it a little further to explain this particular question.

The question is why wouldn't a 9V radio battery substitute for the 6V tractor battery?

Think of the small battery as a tank the size of a pill bottle, full of water and pressurized to 9 psi. If you open a valve on the tank it will squirt out the water at 9 psi until it is all gone. Now think of a tank holding 50 gallons of water pressurized at 6 psi. If you open a valve the same size as the one on the first tank, the water will squirt water out at a lower rate than the first tank, but it will run out MUCH longer.

To simulate a starter, the opening in the valve would be as big as the whole small tank. The water would disappear instantly as the valve opened. The larger tank would last quite a while.

I hope this helps understand the principles of DC electricity.

old · Nov 11, 2012

In simple terms think of volts as to water pressure and amps as to how big a pipe you have. Say you have a pipe 1/8 inch in diameter and 10 PSI pressure you can not get much water out of it. But if you have a pipe 6 inch in diameter and that same 10psi you get a lot out fact same holds true for a battery and the volts is the push and the amps is the power and by the way volts do not kill you but all it takes is one millionth of an amp to kill you

JMOR · Nov 11, 2012

(quoted from post at 16:42:58 11/11/12) In simple terms think of volts as to water pressure and amps as to how big a pipe you have. Say you have a pipe 1/8 inch in diameter and 10 PSI pressure you can not get much water out of it. But if you have a pipe 6 inch in diameter and that same 10psi you get a lot out fact same holds true for a battery and the volts is the push and the amps is the power and by the way volts do not kill you but all it takes is one millionth of an amp to kill you

ichard, you should really stop over stating that millionith of an amp thing or at least qualify is as being applied by electrodes inserted into the brain. I told you all the right values before, copy and paste & tape to your computer screen! :roll:

equeen · Nov 11, 2012

Old was just trying to skeer me - or see if I was as dumb as I look and act at times.

36 Coupe · Nov 11, 2012

Go out and try to start a tractor with a 9 volt smoke alarm battery.Buncha nuts.

equeen · Nov 11, 2012

May I borrow yer mirror? You've looked at yerself long enough. Yer eyes are gonna grow cross-eyed staring at yerself like that.

old · Nov 11, 2012

Don't shoot the messenger. That is as per the U.S. NAVY electronics school and no not at the brain but at the heart. and and yes the number is still 1 millionth amp and if you have that and enough volts to push it all you have to do is grab a live wire in each hand and your dead meat and I will NEVER stop saying 1 millionth because to do so is to make sure some one does get hurt

JMOR · Nov 11, 2012

(quoted from post at 19:14:41 11/11/12) Don't shoot the messenger. That is as per the U.S. NAVY electronics school and no not at the brain but at the heart. and and yes the number is still 1 millionth amp and if you have that and enough volts to push it all you have to do is grab a live wire in each hand and your dead meat and I will NEVER stop saying 1 millionth because to do so is to make sure some one does get hurt

1 millionth= 1/1,000,000=1 X 10EE-6.
1 milliamp=1/1,000=1 X 10EE-3

Attached is Military Standard 454 addressing shock hazards, so you just keep on saying the wrong things. Your millionth doesn't even rise to level of "sensation" or "surprise".
Need more. Also US Department of Labor, attached. I have posted them for you before, but some peoples minds are like cement, all mixed up & permanently set!

equeen · Nov 11, 2012

Okay, if I attach a long heavy cable to my 6v 650CCA or such tractor battery and trim the shielding off the other end to fit my hand.........then attach a long heavy cable to the starter solenoid and trim the shielding off the other end to fit may hand.............

Then have someone turn on the ignition switch as I hold the naked cable ends - one in each hand...

will there be more than enough amps passing thru my body to guarantee that body burial will follow?

Ouch, fellers, this IS getting scary.

1951 8N · Nov 11, 2012

Okay, if I attach a long heavy cable to my 6v 650CCA or such tractor battery and trim the shielding off the other end to fit my hand.........then attach a long heavy cable to the starter solenoid and trim the shielding off the other end to fit may hand.............

Then have someone turn on the ignition switch as I hold the naked cable ends - one in each hand...

will there be more than enough amps passing thru my body to guarantee that body burial will follow?

Ouch, fellers, this IS getting scary.

You cannot get shocked from a 12 volt battery let alone a 6 volt battery.

russb wa · Nov 12, 2012

rpm = volts
torque = amps
rpm * torque = hp
amps * volts = watts
hp = watts

old · Nov 12, 2012

As with any thing to do with electricity there is a lot of theory and due to that many many many factors come into do the same thing you did today and it kills you. lay as to what will kill one person and then the next does the same thing and not get hurt. The condition of a persons heart and other such things come into play as to what may or may not kill you today but then tomorrow you goof and so the reason
I say what I do is because in theory a car/truck/tractor battery could kill you will it not likely unless conditions are just right and one never knows when that condition is right or wrong so why take the chance.
By the way I spent years working on electrical stuff and have been shocked many many times and I am still alive but I have been lucky

JMOR · Nov 12, 2012

(quoted from post at 11:42:49 11/12/12) As with any thing to do with electricity there is a lot of theory and due to that many many many factors come into do the same thing you did today and it kills you. lay as to what will kill one person and then the next does the same thing and not get hurt. The condition of a persons heart and other such things come into play as to what may or may not kill you today but then tomorrow you goof and so the reason
I say what I do is because in theory a car/truck/tractor battery could kill you will it not likely unless conditions are just right and one never knows when that condition is right or wrong so why take the chance.
By the way I spent years working on electrical stuff and have been shocked many many times and I am still alive but I have been lucky

If you were shocked, then you knew you were shocked, i.e., sensation, surprise, maybe pain.....then it was more than one millionth of an amp. :roll:

Anonymous-0 · Nov 12, 2012

think not..touch the end of your tongue to the posts of a little 9volt batt. this is what i would consider a shock..its also a good way to tell if the batt.is good

36 Coupe · Nov 13, 2012

I try to be nice to feeble minded folks but will make an excepetion in your case.

9v Battery for 8N

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