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AlignRC Thunder Power RC
jjeaster222000

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Bedford in

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Hey guys,

Is there anyway to recondition these battery's? Battery is about 2 years old. Maybe 50 flights on it. Haven't had much time to fly lol well anyway, I get about 2.5 minutes out of it with my trex 550 and head sped drops drastically. Then I put my meter on it and it says I have 50% left in the battery? I don't want to trash it because it has no puffing at all and I don't want to buy another always charged it with a balance charger? Any help?

Thanks

Josh.

Team Synergy

08-11-2016 12:40 AM
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JuanRodriguez

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The Villages, Florida

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During all that down time , did you store the battery at a storage charge ??? Other than cycling it a few times I am not aware of any way to recondition the battery . My guess is that one or two cells in your pack are toast

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

08-11-2016 12:46 AM
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jjeaster222000

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Bedford in

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I always store about 40-50% not sure the real rule on it

Team Synergy

08-11-2016 12:47 AM
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Blackhawk6

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Livonia, Mi

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Storage voltage should always be 3.85v per cell. It sounds as if the packs are just tired. What are the IR's on the cells? Have you over discharged this in the past?

Evolution Helicopters Team USA

08-11-2016 01:13 AM
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helifanatix

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Fountain Valley, CA

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it's not the voltage but the capacity
- 50% capacity for storage is ideal
- leaving packs @ close to 100% will result in lost in capacitance (I say anything more then 24hr is not good)
- it can turn your 6S 5000mah into a 6S 4000mah
- kinda look like what happen

Looks like those packs have lost their usefulness, may I suggest the following:
- battery for bench test
- packs for when learning to auto's
- since all your cell lose it's capacitance, you can not salvage the packs
- if one or two cell ruptured, you could pull them apart and replace the bad cells

it's part of the hobby and happens often. best to be safe than take down a $1,000+ bird

- Scott

08-11-2016 01:52 AM
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jjeaster222000

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Bedford in

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I will run a charge on it and test the ir. I never let my packs get below 20% I'm sure it's just a loss.

Team Synergy

08-11-2016 02:06 AM
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jjeaster222000

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Bedford in

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Hey guys. Here is the ir and balance. Not sure how to read the ir.

Team Synergy

08-11-2016 03:30 AM
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Pistol_Pete

rrProfessor

Seffner, FL

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Ideally all cells should read the same.

The lower the better like the 3 Ohms ones

The high ones 6 and 9 are the weakest cells.

~~Enjoying the hobby one flight at a time~~

08-11-2016 03:42 AM
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helifanatix

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Fountain Valley, CA

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I have had packs in worse conditions:
- IR's up to 32ohm
- puffed cell
- big voltage differences between the cells

if the packs are getting worst, they will not get any better. you will see a lack a power and at some point, it's not good for your electronics and connectors in the long run.

- Scott

08-11-2016 05:22 PM
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jjeaster222000

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Bedford in

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Cool. Thanks for the info guys. Guess I will use this as a 2 minute battery

Team Synergy

08-11-2016 05:23 PM
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Rojoalfa

Senior Heliman

Punta de Mata, Monagas-Venezuela

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/
/

According to your readings, Your pack is in a very nice condition.

1.- cells up to 10 mohms are new.
2.- cells between 10 and 25, are plenty of power.
3.- cells with more than 25 are old and already dead...

Run with no mercy to discharge your LIPO at to 20%, no problem.

/

Saludos cordiales,

08-11-2016 08:30 PM
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Rojoalfa

Senior Heliman

Punta de Mata, Monagas-Venezuela

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/
/

You do this simple calculation...

2063 mah times 2, 4126 mah
Then divided by 5000 , 0.82
0.82 times 100, 82%

That means you charge your LIPO with 82% of the capacity.
So, you run and discharge with 18%. Very Good.

/

Saludos cordiales,

08-11-2016 08:39 PM
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Rojoalfa

Senior Heliman

Punta de Mata, Monagas-Venezuela

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/
/

With different reading of IR, I recommend to discharged the pack up to 3.0 volts each cell.
Then, charge at 1/2C, 2500 ma, 2.5 A, and report your reading.

/

Saludos cordiales,

08-11-2016 08:48 PM
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jjeaster222000

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Bedford in

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Really? Ok I'll give that a try. It always been told no less than 3.7v per cell?

Team Synergy

08-14-2016 01:06 AM
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helifanatix

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Fountain Valley, CA

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again .. it's not the voltage but the actual capacity.

Use your charger to find the capacity or any good cell checker to find out.

- Scott

08-14-2016 04:23 AM
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Rojoalfa

Senior Heliman

Punta de Mata, Monagas-Venezuela

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/
/

Max delivery safe capacity of your LIPO 5000 mah, is 2500 mah.
Half of label capacity.

You reach that discharging at 100% , leaving 0% on LIPO pack. So, each cell must have 3.6 volts.
The other half remain in the pack and is not avalaible...
Obviously, that energy is from 3.6 volts to zero.

Voltage LIPO
4.20 are 100%,
4.03 are 76%,
3.86 are 52%,
3.83 are 42%,
3.79 are 30%,
3.70 are 11%
3.60 are 0%

According to your charger, your LIPO is just waiting to Fly a lot!

Older LIPO fails badly when you discharged below 3.7 volts.
Newer LIPO dont.

/

Saludos cordiales,

08-14-2016 07:18 PM
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Richardmid1

rrProfessor

Leeds, England

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. 1.- cells up to 10 mohms are new.
2.- cells between 10 and 25, are plenty of power.
3.- cells with more than 25 are old and already dead...
Cell resistance depends on the cell capacity, state of charge and temperature.

9.3 mohms is quite high for a fully charged 5000mah cell. A NEW fully charged 5000 cell should be between 1 and 3 mohms at room temperature.

60% of the time, it works every time!

08-30-2016 08:22 AM
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Pistol_Pete

rrProfessor

Seffner, FL

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At OP
This thread merits a revisit for the sake of SAFETY.

Please visit the following link and insert your max and min ohm reading along with cell capacity to give you an idea of what's happening.

http://www.jj604.com/LiPoTool/ (OHMs Law in disguise)

You will see that your highest 9.3 Ohm can SAFELY deliver 57 Amp while your lowest 2.9 Ohm can SAFELY deliver 102 Amps.

As I mentioned, "ideally" there should be all equal.

Your short flight times is practically governed by the weakest cell.

If your setup-flying style draws more than what the weakest cell can safely deliver, that's when kaos (high temp, puff and poof) sneaks in.

Given you stated you will fly it for a shorter time, consider using a lipo alarm set to 3.6V. in order to chirp when the weakest cell has reached its safe discharged state and avoid a forced autorotation or worse.

Your ESC may be set to cut off at 3.5V (notice one tenth below lipo) but what it really does is multiple the cell count of 6 × 3.5 = 21V and cuts off accordingly. It does not know the individual cell voltage unlike the lipo alarm. So your weakest cell (9.3ohm) is over discharged instead.(kaos)

I hope this helps to better understand what is happening in your situation.

~~Enjoying the hobby one flight at a time~~

08-31-2016 04:17 PM
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jjeaster222000

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Bedford in

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Thank you mr Pete. I will check that out.

Team Synergy

08-31-2016 04:59 PM
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jjeaster222000

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Bedford in

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Now I have three pulse battery's that are toast. All are 6s 5000. I can barley get 3 minutes out of them before they die out. I have an old turnigy battery that is puffed with higher ir and it runs better. I guess I need new packs

Team Synergy

09-13-2016 05:22 PM
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