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Old Mar 31, 2012, 05:32 PM
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Shortman's Avatar
United States, OR, Portland
Joined Nov 2003
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Sweet, let me know how you like it! I need to get one myself so I can get real accurate measurements. For now the iCharger is doing fine :P.
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Old Mar 31, 2012, 08:48 PM
SoCal, Year Round Flying!
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Newport Beach, CA
Joined May 2002
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Will do!
I just finished putting 3 cycles on each pack so far.
Resistance keeps dropping each cycle.
4, 5, 5, and 6mohms.
TX battery needs recharging before continuing but I feel better with these numbers.
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Old Mar 31, 2012, 09:21 PM
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United States, FL, Miami
Joined Jan 2012
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I have 3x 4S 4500 35C Zippy Compacts here, but haven't used them yet..still building my multirotor.

How do I test their IR with a Powerlab 6 without the computer connection? Is it possible or do I need the CCS software?
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Old Mar 31, 2012, 09:43 PM
1,1,2,3,5,8,13,21,34
Shortman's Avatar
United States, OR, Portland
Joined Nov 2003
2,116 Posts
I just retested my packs with the iCharger 306b at 3.85V (storage voltage) at 66F.
These are Gens Ace 25C 6S 3800mah packs

20 cycles on each pack

Pack 1A: (2,2,2,3,1,1) 11mOhms
Pack 1B: (2,2,2,2,1,1) 10mOhms
Pack 2A: (2,2,2,2,1,2) 11mOhms
Pack 2B: (2,1,2,2,1,1) 9mOhms
Pack 3A: (2,2,2,2,1,1) 10mOhms
Pack 3B: (2,2,2,2,2,1) 11mOhms

Getting better :P.
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Old Apr 01, 2012, 02:42 AM
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Newport Beach, CA
Joined May 2002
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Finished 5 cycles on all 4 5S 4500 packs.
IR readings on my Hyperion seem to have stablized around 5mohms.
I ran 1/2 throttle for 7-8 minutes using(abusing) my skyraider.
Voltage reading prior to recharging was around 3.80-3.85V.
Hope thats low enough to be considered a cycle.
Pack temp would barely change, went from cool to not quite as cool.
2C recharge was typically 1700-2100Mah
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Old Apr 01, 2012, 03:09 AM
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Shortman's Avatar
United States, OR, Portland
Joined Nov 2003
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Quote:
Originally Posted by bmiller View Post
Finished 5 cycles on all 4 5S 4500 packs.
IR readings on my Hyperion seem to have stablized around 5mohms.
I ran 1/2 throttle for 7-8 minutes using(abusing) my skyraider.
Voltage reading prior to recharging was around 3.80-3.85V.
Hope thats low enough to be considered a cycle.
Pack temp would barely change, went from cool to not quite as cool.
2C recharge was typically 1700-2100Mah

Nice Miller! I am excited to see your ESR readings when you get the new device. If they stay what they are within what your Hyperion charger is reading I will definitely be buying a few of these packs :P.

And to be clear, this is 5 mOhms for the entire pack correct, not each cell?

Based on your results right now, those packs would have a true C rating of 37C or 164 amps max current! Which is higher than my Gens Ace 25C packs are pulling right now. That would be awesome.
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Old Apr 01, 2012, 12:58 PM
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Yes 5mohms for entire pack.
Hopefully if the meter gets shipped on monday, I'll be using it thursday!
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Old Apr 01, 2012, 01:34 PM
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Rugby, UK
Joined Feb 2007
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Quote:
Originally Posted by bmiller View Post
Yes 5mohms for entire pack.
Hopefully if the meter gets shipped on monday, I'll be using it thursday!
Call me a cynic, but I will be surprised if you really finish up with an average cell reading of 1.25 milliohms. Having said that I am constantly surprised by how good lipos are now which makes it all the more surprising that so many makers feel it necessary to exaggerate their capabilities - competition they call it!
Take care with the temperature when you read it and specify it with the results.


Wayne
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Old Apr 02, 2012, 02:54 AM
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Newport Beach, CA
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I hope for the best but knowing my hyperion is inaccurate at reading IR, I expect the numbers to rise, hopefully not by too much. I'll note the temp for everybody too.
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Old Apr 02, 2012, 04:50 AM
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Well I also ordered a 4s 2200mah 35c pack to try out.

Reason being is I currently have 2x Turnigy 4s 2200 30c packs and a single Zippy Flightmax 4s 2200 30c pack. Now my subjective opinion has always been that the cheaper Turnigy packs outperformed the Zippy Flightmax packs, based of flight performance and the Zippy always felt a bit warmer after a flight. That opinion seems to have been confirmed when my Zippy came down all puffed up today and my Turnigy's came down fine, admittedly I was pushing them pretty hard today.

So today I ordered the 35c Compact and I also ordered a 35c Nano-tech pack to try out as well. Now I fully expect the Nano tech to hold voltage under load better, but the compact is a a good ounce lighter so flight performance may feel similar.
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Old Apr 02, 2012, 06:02 PM
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bmiller's Avatar
Newport Beach, CA
Joined May 2002
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Surprise! The ESR meter arrived today! Talk about fast service!
Looks good and works like a charm!
Here's what the meter reads.
4 Zippy 5S 4500 compacts at storage voltage 19.16V
Temp 68F

Pack 1
pack IR = 20.4mohm
cell1 3.08
cell2 3.08
cell3 3.12
cell4 3.00
cell5 3.12

Pack2
pack IR = 20.1
c1 3.08
c2 3.83
c3 3.20
c4 3.04
c5 3.24

Pack3
pack IR = 22.2
c1 3.32
c2 3.08
c3 3.28
c4 3.20
c5 3.20

Pack4
pack IR = 20.7
c1 3.08
c2 3.12
c3 3.48
c4 3.00
c5 3.24

so approx. a True 21C battery.
Also looks like my hyperion duo measures IR from one cell not pack IR (still inaccurately too)
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Old Apr 03, 2012, 12:05 AM
1,1,2,3,5,8,13,21,34
Shortman's Avatar
United States, OR, Portland
Joined Nov 2003
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Quote:
Originally Posted by bmiller View Post
Surprise! The ESR meter arrived today! Talk about fast service!
Looks good and works like a charm!
Here's what the meter reads.
4 Zippy 5S 4500 compacts at storage voltage 19.16V
Temp 68F

Pack 1
pack IR = 20.4mohm
cell1 3.08
cell2 3.08
cell3 3.12
cell4 3.00
cell5 3.12

Pack2
pack IR = 20.1
c1 3.08
c2 3.83
c3 3.20
c4 3.04
c5 3.24

Pack3
pack IR = 22.2
c1 3.32
c2 3.08
c3 3.28
c4 3.20
c5 3.20

Pack4
pack IR = 20.7
c1 3.08
c2 3.12
c3 3.48
c4 3.00
c5 3.24

so approx. a True 21C battery.
Also looks like my hyperion duo measures IR from one cell not pack IR (still inaccurately too)
Now THAT is a difference . I am going to have to pick up one of these ESRs. Report back after you get some more cycles on them, see if they improve some more...
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Old Apr 03, 2012, 09:17 AM
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Rugby, UK
Joined Feb 2007
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Quote:
Originally Posted by bmiller View Post
Surprise! The ESR meter arrived today! Talk about fast service!
Looks good and works like a charm!
Here's what the meter reads.
4 Zippy 5S 4500 compacts at storage voltage 19.16V
Temp 68F

Pack 1
pack IR = 20.4mohm
cell1 3.08
cell2 3.08
cell3 3.12
cell4 3.00
cell5 3.12

Pack2
pack IR = 20.1
c1 3.08
c2 3.83
c3 3.20
c4 3.04
c5 3.24

Pack3
pack IR = 22.2
c1 3.32
c2 3.08
c3 3.28
c4 3.20
c5 3.20

Pack4
pack IR = 20.7
c1 3.08
c2 3.12
c3 3.48
c4 3.00
c5 3.24

so approx. a True 21C battery.
Also looks like my hyperion duo measures IR from one cell not pack IR (still inaccurately too)
Thanks for kind words on the meter.
I assume that the cells have been cycled in which case the IR will be stable.
As you say 3 milliohms suggests a 21C rating, say 95A which would give you just over 1700 watts which equates to just about 2HP at the prop allowing for Esc and motor efficiencies.
Remember the calculator (http://www.jj604.com/LiPoTool/) gives a current which the lipo can deliver continuously throughout the discharge so that short bursts up to 3HP would be ok. The point of the calculator is to keep the heat dissipated in the lipo down to reasonable limits. In this example the initial heat would be 135watts but if you try to use the 35C rating which is claimed, this rises dramatically to over 370watts; approaching 3 x as much heat.
At 35C the middle cells would initially have to dissipate 75watts each with virtually no outside surface area - is it any wonder they die early?

We don't know your application for the packs but if you need less than 1750W (2HP) with 2600W (3HP) surges then they should be fine.

Wayne
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Old Apr 03, 2012, 09:36 AM
Frankenstein recycled packs
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USA, AZ, Gilbert
Joined Jan 2006
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I have 7 cycles on both of my 4S 1300 packs now. IR went from around 8 (post #8) to mid 5's BUT ambient went up from low 60's to 72F.
I have no regrets...yet. Now, cycle life testing...

Rick
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Old Apr 03, 2012, 07:51 PM
SoCal, Year Round Flying!
bmiller's Avatar
Newport Beach, CA
Joined May 2002
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No regrets here either.
The meter works fantastic, very easy and quick to use, Highly recommended.
These packs are primarily for my 10S Tams F-16, 1515 Neu w/ 90mm shubeler fan, draw is 90A thereabouts at wot. Most of the flying is 1/2-3/4 power with several low level blasts down the runway.
At the most I'll pull 20C. These packs are perfect for it.
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