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HelicopterMain Discussion › Reducing the internal resistance of LiPos
heliraptor10

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kokomo, in-US

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4 Cell new battery no EMF boost final reading 3rd charge of the day.

And this battery began the day here


Sorry it's upside down.

Goblin! where have you been all my life?

04-17-2017 12:44 AM
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heliraptor10

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kokomo, in-US

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I meant Nikola Tesla... Not the auto maker...

It was not his patent,
Just that era...
Early 1900s
I'm having trouble finding it again.

Goblin! where have you been all my life?

04-17-2017 12:54 AM
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heliraptor10

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kokomo, in-US

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Old 4s
EMF boosted
3rd charge of the day
Final reading

This battery began the day here

Goblin! where have you been all my life?

04-17-2017 01:06 AM
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heliraptor10

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kokomo, in-US

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Very little change overall as expected in the newer pack.

But the older packs numbers have gotten lower.

And tomorrow they will go a bit lower

Edit:
And if it goes completely as expected you'll see that the "off" cell with higher resistance will reach a balance with the other cells.

Yeah I know. You can't do that...

Goblin! where have you been all my life?

04-17-2017 01:12 AM
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heliraptor10

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kokomo, in-US

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After I messed around with this for a bit I did research that says that there's no way that you can lower a battery's resistance outside of small fluctuations attributed to temperature.

I even contacted a company that makes batteries, and a very nice man explained why it was impossible. But maintained an interest in the brief notes I was giving him. I had held on to the missing ingredient till recently after deciding to share with you guys first.

Goblin! where have you been all my life?

04-17-2017 01:30 AM
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Heli_Splatter

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Silver Spring, MD by way of Sidney, Ne - USA

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It would be interesting to note the IR a day later together with battery temperature. Resistance changes with temperature.

We found that flying our batteries, charging and re-flying was important to get peak performance.

04-17-2017 12:38 PM
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heliraptor10

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kokomo, in-US

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I'm going to do EMF boosted charges today
Tomorrow I will do non EMF boosted charges. This should demonstrate the residual effect as non thermal in nature.

Goblin! where have you been all my life?

04-17-2017 01:09 PM
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Heli_Splatter

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Silver Spring, MD by way of Sidney, Ne - USA

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Could you measure the same batteries you charged yesterday to get their current IR?

It is hard to believe that magnetic energy is doing anything to change these batteries. That is why all the questions. Hard to believe that the batteries can be repaired/fixed after their IR is permanently increased.

04-17-2017 03:06 PM
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EEngineer

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TX

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Everyone on the face of the earth charges their batteries under the influence of a magnetic field.....as the earth's magnetic field is ~50 Gauss....

Or.....~50 microteslas

https://en.wikipedia.org/wiki/Earth%27s_magnetic_field

But few of us charge a battery using an 18 foot positive lead to the battery charger......25 turns of 10AWG copper wire(2&5/8" diameter coil @ .99 ohms per 1000' = ~18 feet).

Maybe that's the secret....

Logo 600SXs, 700XX, 800XX

04-17-2017 07:05 PM
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AirWolfRC

rrProfessor

42½ N, 83½ W

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.....as the earth's magnetic field is ~50 Gauss....
I think you missed a decimal point there . . . .

04-17-2017 07:27 PM
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EEngineer

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TX

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You're right...in fact 2 decimal points....

My missed the period key.....

Should have read before posting....lol

It's ~0.5 Gauss.....

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04-17-2017 08:08 PM
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EEngineer

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TX

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And, the earth's magnetic field is polarized N/S for the most part....

Like this...

https://www.nasa.gov/mission_pages/...nes-dipole.html

With regards to heliraptor's 3-axis magnetometer of his phone, perhaps one of the "axes" weren't aligned with the earth's magnetic field.

I saw a YouTube video of a guy demonstrating the accuracy of his phone magnetometer....and read ~50 microteslas when 1 of the 3 axes were aligned....and the axis perpendicular read much less.

Would recommend using the phone to "calibrate" his experimental set-up with regards to measurements of the magnetic field.

Which is the combination of the earth's field + the field induced by the 25T coil.

Here's a simple calculator for a coil's magnetic field:

http://hyperphysics.phy-astr.gsu.ed...c/solenoid.html

For this coil the relative permeability is ~1. Fill in the boxes and click on "Magnetic Field".

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04-17-2017 08:24 PM
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EEngineer

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TX

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"But the power supply becomes unstable at about 5 amps and the cellpro stops."

To avoid that instability, try this:

Why not keep the coil's power separate from that of your charger?

For the coil, connect the +12V to the coil with a 3 Ohm/50W power resistor...Radio Shack has them(if RS is still in business).

Then you would have 4A powering the 25T coil.

Then, also tap off the +12V supply to power the charger.

And, by varying the resistor value, the magnetic field of the coil could be increased/decreased during experimentation.

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04-17-2017 08:41 PM
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AirWolfRC

rrProfessor

42½ N, 83½ W

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One decimal point - - -
two decimal places - - -

04-17-2017 08:44 PM
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heliraptor10

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kokomo, in-US

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The instability of the power supply is independent of the coil.

When I say old 4 cell it is always the same old 4 cell

When I say new 4 cell it is the same new four cell.

My thinking/theory is that the batteries are more susceptible to magnetic fields during electron flow. So sitting in a box at storage charge the primary magnetic flux line going through it would be that of the earth's magnetic field. But any changes in that or the orientation of the battery would be imperceptibly minor.

I'm charging now.

And I know you have to calibrate... Basically as often as you want an accurate reading.
And yes I know you have to calibrate each axis.

I went to a lot of trouble to build a vertical compass for an unrelated project only to find a wonderful digital solution in my hand.

Goblin! where have you been all my life?

04-17-2017 08:56 PM
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AirWolfRC

rrProfessor

42½ N, 83½ W

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If you use any resistor, you'll just be wasting the energy.

Forget about the 10ga wire.

Use 12ga and about 70 turns on a 2-1/2" dia. core.
Tha'ts 46ft giving 0.073 ohms in series with the charger.
That's only a 0.3V drop across the coil with 4 amps.
Or 0.46V drop using 14ga.
- - - not enough to affect the charger operation.

I'll let EEngineer figure out the field strength - - -

04-17-2017 08:56 PM
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heliraptor10

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kokomo, in-US

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In a normal charging scenario the local emf would be weak so overall not a lot of scrambling.

But during use...
Lot of a electron flow and a lot of EMF.

Goblin! where have you been all my life?

04-17-2017 09:00 PM
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heliraptor10

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kokomo, in-US

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Old 4 cell
First charge of the day
With EMF boost
Final reading

Goblin! where have you been all my life?

04-17-2017 09:02 PM
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heliraptor10

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kokomo, in-US

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New 4 cell
no emf boost
First charge of the day
Final reading

Goblin! where have you been all my life?

04-17-2017 09:41 PM
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EEngineer

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TX

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"If you use any resistor, you'll just be wasting the energy."

It could be employed to keep your coffee mug warm....

And then increasing the coil's magnetic field would result in the coffee's rise in temp.....

Logo 600SXs, 700XX, 800XX

04-17-2017 10:31 PM
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HelicopterMain Discussion › Reducing the internal resistance of LiPos
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