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HomeRC & Power✈️Aircraft🚁Helicoptere-Electric Battery-Charger-pSupply › Brand new Pulse packs with high IR
08-30-2013 03:37 AM  5 years ago
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S76 Mech

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Hatboro, Pa.

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Brand new Pulse packs with high IR
I just bought 2 new Pulse Ultra 6S 3700 packs tonite. Soldered up some EC5's and threw em on the charger. I decided to see what the IR was after the first pack was done charging. I was surprised to see 23mohms on the first pack. The second pack I checked before I even put it on for the 1st charge and it was 35mohms. WTF, I really didn't expect such high IR numbers from brand new packs. Is this normal, do they come down after they discharge the first time? My Gens Ace 3700s have an IR of 6 and 7 mohms.

This is the first time I've used Pulse packs, can someone shed some insight on this for me.

Thanks,
Rick
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08-30-2013 04:07 AM  5 years ago
S76 Mech

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Hatboro, Pa.

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just checked the IR on pack 2 after its first charge and it came down from 35 to 22.

gonna check em tomorrow after they fly. Hoping they just have to break in. Just never seen such high IR on new packs.
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08-30-2013 04:33 AM  5 years ago
Ace Dude

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USA

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What are you using to measure the IR?  
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08-30-2013 04:49 AM  5 years ago
S76 Mech

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Hatboro, Pa.

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I charger 306bGaui Greatness X7, X5, NX4, X3
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08-30-2013 06:55 PM  5 years ago
qraptor

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Illinois

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IIRC some cells have a protector inside, to reduce the risk of shorting or similar failures in transit. It gets "burned off" after 3-4 charge re-charge cycles. I thought that it reduced the capacity initially, but it is possible that this is the case with these cells.

Just to be on the safe side you may not want to stress the batteries too much over the first 3-4 cycles
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09-03-2013 02:27 PM  5 years ago
kamaroman540

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Maple Shade N.J

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to high ir??
Hello guys ,still a little new here,whats considered to hi a ir,have packs in the 5-7 range with a little over 100 cycles each.thanks for the help -I used a 3010tomessure them
LOGO600SX LOGO400SE
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09-03-2013 02:45 PM  5 years ago
S76 Mech

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Hatboro, Pa.

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My gens ace packs are all around 5-7 micro-ohms. These pulse packs now have 3 cycles on them and are still around 23m-ohms. Don't get it...Gaui Greatness X7, X5, NX4, X3
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09-03-2013 03:25 PM  5 years ago
Ace Dude

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USA

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It does seem high. Some packs will see their IR go down after ~8-12 cycles. Temperature also plays a huge role in IR measurement.

Can you let all the packs stabilize at room temperature for 8+ hours and then check all the packs again? Will be interesting to see if the IR comes down as the number of cycles on the pack increases.
  
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09-03-2013 04:39 PM  5 years ago
JKos

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Redondo Beach, CA

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S76 Mech,
How are the Pulse packs performing in flight?

Some brand new Gens Ace packs I have are reading 1 mOhm per cell on my 306B.

- John
RR rules!
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09-04-2013 12:36 AM  5 years ago
S76 Mech

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Hatboro, Pa.

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Jkos, they are performing quite well. I just don't like the high numbers.

My Gens ace are the same way, 1mohm per cell, 6-7mohms per pack.

Pulse packs are 3-4mohm per cell.
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09-04-2013 01:29 AM  5 years ago
S76 Mech

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Hatboro, Pa.

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Just charged both packs from yesterdays flights. Both packs were 23mohms before charge, 13mohms after charge.
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09-04-2013 01:33 AM  5 years ago
Ace Dude

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USA

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State of charge has little impact on IR numbers, however, temperature does have a significant impact. If you charged them at a high rate or after just completing a flight and they were warm you'll get lower IR readings.  
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09-04-2013 02:50 AM  5 years ago
S76 Mech

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Hatboro, Pa.

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Agreed. But still confused. I charged them at 2C which is pretty low considering they are rated to a 5C charge. They are by no means warm during or after the charge.

The pack IR remains the same from yesterday after I flew them (23mohms) till this evening when before I recharged them (23mohms). Then, it came down to (13mohms) after charging. Then they stay the same until I fly them.

All this has nothing to do with the fact that the numbers are still 3 times higher then my other packs respectively. Like I said, the packs have 4 flights on them and have not come down permanently in IR numbers.

After a flight they are 23mohms, after a charge 13mohms, consistently.

Is there a PULSE rep that can shed some light on this subject ?
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09-04-2013 05:44 PM  5 years ago
qraptor

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Illinois

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Well, after 4 cycles you are right to expect the IR to drop down. This seems too high.

Even if you are getting decent flights at present, my feeling is that they won't have much longevity.

Send an email to the vendor? They may be willing to help.
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09-04-2013 07:13 PM  5 years ago
Tyler

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Chicagoland area

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My Hobby People packs show 1-2mOhms. Some are new. Some are three years old. Occasionally I'll get up to 3mOhms on a pack.Enjoy things that money can buy IF you don't lose the things money can't buy.
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09-09-2013 06:20 PM  5 years ago
S76 Mech

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Hatboro, Pa.

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Good News!
Well after attending the Hamilton RC 'Friend Fly' yesterday, I got 4 flights on the Pulse packs. Flew them pretty hard. At the end of the day, I decided to measure the IR on both packs.

Both packs were down from 23 to 4 total m-ohms. That is an acceptable number for me. I guess qraptor was correct and the packs just needed to be broke-in. So, I would say they took about 10 cycles to get there.

I'm good to go.

Rick
Gaui Greatness X7, X5, NX4, X3
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09-09-2013 07:08 PM  5 years ago
qraptor

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Illinois

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Good to hear that
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