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HelicopterMain Discussion › Reducing the internal resistance of LiPos
04-20-2017 11:51 PM  69 days agoPost 161
heliraptor10

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kokomo, in-US

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Just doing your good deed?

Protecting the good citizens of runryder from pseudoscientific crackpots?

Goblin! where have you been all my life?
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04-20-2017 11:52 PM  69 days agoPost 162
heliraptor10

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kokomo, in-US

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Yeah yeah
Even calling it pseudoscience is giving it too much credit..

Right?

Goblin! where have you been all my life?
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04-21-2017 12:20 AM  69 days agoPost 163
EEngineer

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Just asking some questions....

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04-21-2017 12:29 AM  69 days agoPost 164
heliraptor10

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kokomo, in-US

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Here's the disclaimer for the link you posted:
"Disclaimer
While every effort was made to ensure that the information contained in this publication is accurate, Cadex does not warrant or guarantee the accuracy and completeness of the information published herein; neither does Cadex take responsibility for any errors, omission or damages arising from this information. The graphs and tables included are for illustration of typical battery applications and are not intended as constructional information to solve engineering issues."
That is a statement

Not a question.

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04-21-2017 12:36 AM  69 days agoPost 165
EEngineer

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I'm not the author of that statement from the link you posted...

You made the post...in response to a statement you made about LiPo "knowing" that a digital circuit is connected.

Rather than any other kind of circuit....that doesn't make sense.

No tricks involved.

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04-21-2017 12:40 AM  69 days agoPost 166
EEngineer

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And why would you blame me for asking questions about your test setup?....

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04-21-2017 01:03 AM  69 days agoPost 167
Heli_Splatter

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

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You really need to standardize the temperature of the batteries and record internal resistance at room temperature before charging. Then after charging, you need to let the batteries cool down to the room temperature and then take the IR reading.

Internal resistance changes with temp.. so you have to take this variable out of the equation in order to get any results worth discussing.

I would also not be powering the coil with the same power supply as the charger, just to keep all of those variable out of the result. As I see it now, all you have is a scattered uncontrolled data-set. I appreciate your energy. You have a long way to go to get the engineers here on-board.

I would also suggest, that if this were really the holy grail of battery charging, you would not be publishing any results publicly.

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04-21-2017 01:26 AM  69 days agoPost 168
EEngineer

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"Internal resistance changes with temp.. so you have to take this variable out of the equation in order to get any results worth discussing.

I would also not be powering the coil with the same power supply as the charger, just to keep all of those variable out of the result."

Very good suggestions....I think.....

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04-21-2017 01:54 AM  69 days agoPost 169
heliraptor10

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I'm going to do some YouTube videos

I can get the IR reduced on my oldest battery, it will show the biggest change.

If I were to reduce the IR by half,

How long would you want me to wait before charging the battery normally,
To demonstrate it is independent of temp.

I can record temps.

I would think 24 hours would be enough.

But I can wait longer.

Goblin! where have you been all my life?
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04-21-2017 01:58 AM  69 days agoPost 170
heliraptor10

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kokomo, in-US

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It's a shame I don't have two identical batteries.

Ok how about this?

I'll charge my two 4 cell batteries at the same time. One in the coil and one out of the coil and as far away as wires allow.

A few cycles with temps and it should be pretty obvious.

Goblin! where have you been all my life?
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04-21-2017 02:04 AM  69 days agoPost 171
heliraptor10

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I don't know if it's the holy grail,

But it's just a coil so I decided I'd share.

I've tried to patent something before, it's not something I'll try alone again. And big surprise I've got dozens of half arsed prototypes for various inventions, so I'm not worried about giving away this concept.

Goblin! where have you been all my life?
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04-21-2017 02:26 AM  69 days agoPost 172
JuanRodriguez

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The Villages, Florida

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My coil is bigger than your coil !!
I hope Mark doesn't delete my post this time because it offends you .....

Been there, done that and old enough to know better.....

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04-21-2017 02:50 AM  69 days agoPost 173
heliraptor10

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kokomo, in-US

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I've accepted the size of my coil

And the fact that it's a little warped in places, and overall it's not very straight.

But it seems to get the job done,
But that may be in my head...

Goblin! where have you been all my life?
RC helis, the original fidget spinners

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04-21-2017 02:52 AM  69 days agoPost 174
heliraptor10

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kokomo, in-US

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I've never reported anyone's post.

Never been so upset by anything to need to do that.

Goblin! where have you been all my life?
RC helis, the original fidget spinners

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04-21-2017 03:33 AM  69 days agoPost 175
EEngineer

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Good...

Why were you "yelling" a few posts ago?....

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04-21-2017 04:26 AM  69 days agoPost 176
heliraptor10

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kokomo, in-US

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Because I asked a question,
To specifically address the doubts raised

And no one has replied

And I didn't want to repeat it so I bolded and blew it up.

Goblin! where have you been all my life?
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04-21-2017 04:56 AM  69 days agoPost 177
heliraptor10

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kokomo, in-US

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I get the feeling no one wants to make a prediction about the results of that

Which if I'm wrong should be straight forward.

We'll see if anyone is willing to call it before I get er done.

Should I make more predictions?
Up to date this is what I have observed
Emf boost semi-permanently lowers IR by 20 to 50% with regular use.
With continuous emf boost charging the cells will eventually reach a bottom point where they go no lower. They balance, all the resistance numbers end up the same.
And the next day without EMF boost,
They are nearly the same.
Now 2 days 3...etc
It seems to fade in about a week on my big batteries. An important note is that they return to pre boost numbers, no worse.

You don't have to believe it,
But I can show you.

You guys keep saying temperature

Do any of your batteries cycle up or down with 20% to 50% different internal resistance readings just based on ambient temperature?
Yeah if you push them too hard you can raise the resistance that much.
But I'm lowering it.

Goblin! where have you been all my life?
RC helis, the original fidget spinners

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04-21-2017 05:19 AM  69 days agoPost 178
EEngineer

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"no one wants to make a prediction about the results "

Well, yeah....

The test setup is still a little "iffy"....and a $5 resistor seems beyond the scope of this effort.

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04-21-2017 05:22 AM  69 days agoPost 179
heliraptor10

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kokomo, in-US

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If I can show you on the same screen
My charging rig with both batteries in view,
One in the coil and one out of the coil,
And me doing interval temps
All in one video start of charge to finish

Will you make a prediction?

Such as, oh I don't know
"Yeah the boosted battery will have lower IR but it is still due to the inductive heat"

Sounds like a winner right?

Goblin! where have you been all my life?
RC helis, the original fidget spinners

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04-21-2017 05:27 AM  69 days agoPost 180
EEngineer

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TX

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No....not until you fix your test setup.

And show that your phone's magnetometer displays the proper reading of the earth magnetic field.

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HelicopterMain Discussion › Reducing the internal resistance of LiPos
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