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11-30-2017 04:31 AM  81 days agoPost 61
rcflyerheli

rrKey Veteran

Granbury, TX USA

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Thanks. I just made my post from memory, as I built a buddy a large DJI S800, and we installed Pulse 10,000 packs that were huge. I didn't actually look at the packs that were referenced. I guess the idea that hit me is that the thread got so engrossed in C ratings no one ever mentioned fit.

Goblin 700, Trex 700DFC, Gaui X7, Logo 690SX, Logo 600SX; Trex 470 Trex 500
Amain Team Rep

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11-30-2017 02:13 PM  81 days agoPost 62
RM3

rrElite Veteran

Killeen, Texas - USA

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thats the biggest problem with C ratings... most packs (you may already know) are really only actually made by a handful of manufacturers... they then separate and sort the packs by testing, which will then determine both price and things like C rating.

once sold (contract or otherwise) the next guy may re-test (like TP) and then once satisfied simply assemble groups of cells, put their own wires, connectors, shrink wrap and label on the units, along with any promises or BS stats...

if I recall, I think there were like 4 maybe 5 places that made our Lipo Packs... none of which are here in the states:
-Great Power Battery
-LiPol Battery Co., Ltd
-Onbo power
-Padre Electronics Co
-AGA Technology Co., Ltd
(the others are mostly re-sellers)

funny considering its almost the same thing as Chicken egg farming...

showing a preference will only get you into trouble, 90% of everything is crap...

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11-30-2017 02:16 PM  81 days agoPost 63
Richardmid1

rrProfessor

Leeds, England

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I used to run 10s 8000mah 25C in my 800 running 1750 rpm and smacking the hell out of it! Did they puff? NO. Did they lose performance? NO. Do I still have them? YES. Do they perform like new? YES.

I also have 20C, yes 20C 6s 5000 packs for my Logo 550sx which I can kill in less than 4 minutes at 2400 rpm! Are they fine? YES. Have I had them over a year? YES.

Don't buy into the C rating thing, your only keeping battery prices high!! Learn how to setup a heli and how to charge and look after Li-po's. If you don't care about learning this stuff and have more money than sense then keep buying expensive packs just because someone has stuck a 60C sticker on them!

60% of the time, it works every time!

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11-30-2017 02:27 PM  80 days agoPost 64
RM3

rrElite Veteran

Killeen, Texas - USA

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because someone has stuck a 60C sticker on them!
I think I re-call seeing a 100C rating once... I cant remember the pack name, but it was gray and sold like cheap... One guy told me at the field they were re-branded automotive airbags...

showing a preference will only get you into trouble, 90% of everything is crap...

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11-30-2017 02:28 PM  80 days agoPost 65
ICUR1-2

rrElite Veteran

Ottawa, Ontario

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Richardmid1
Don't buy into the C rating thing, your only keeping battery prices high!! Learn how to setup a heli and how to charge and look after Li-po's. If you don't care about learning this stuff and have more money than sense then keep buying expensive packs just because someone has stuck a 60C sticker on them!
Agreed 100% setup comes first.
I think people got lazy with combo kits that are spec for 3d

spending time, paying attention

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11-30-2017 02:41 PM  80 days agoPost 66
gwright

rrVeteran

Champaign Il

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RM3
if I recall, I think there were like 4 maybe 5 places that made our Lipo Packs... none of which are here in the states:
-Great Power Battery
-LiPol Battery Co., Ltd
-Onbo power
-Padre Electronics Co
-AGA Technology Co., Ltd
(the others are mostly re-sellers)
Not that way anymore. Actually, you don't have a couple of the very first ones in that list,.. and currently there are multiples of the quantity listed

Gary Wright

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11-30-2017 03:06 PM  80 days agoPost 67
Richardmid1

rrProfessor

Leeds, England

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I think people got lazy with combo kits that are spec for 3d
Remember when the Trex 600e Pro came out and it could hit 2700 rpm if you weren't careful and needed 2400 rpm or the tail would blow out?! haha

60% of the time, it works every time!

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11-30-2017 03:14 PM  80 days agoPost 68
AirWolfRC

rrProfessor

42½ N, 83½ W

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C ratings are a number that is not standardized. I have not found any industry "standard" that spells out the conditions under which the C rating is measured . . . let alone how long a pack can deliver that rating. The cut-off voltage used for that measurement is also a mystery. You may find that something closer to 3 volts is used. The internal resistance comes into play here.

All packs will deliver more total energy at a lower current draw than under a higher current draw . . . and again . . . none of those particulars are divulged by the manufacturers. Have to do your own testing to get those details.

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11-30-2017 03:51 PM  80 days agoPost 69
RM3

rrElite Veteran

Killeen, Texas - USA

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Have to do your own testing to get those details
hence the reason some of us can get away with 20C packs... and others need 45C TPs...

showing a preference will only get you into trouble, 90% of everything is crap...

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11-30-2017 04:39 PM  80 days agoPost 70
gwright

rrVeteran

Champaign Il

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some of the battery sellers simply predict the C rating based on IR,.. some actually measure. It's always going to be apples to oranges though because they're not all tested the same and duty cycle also comes into play. A 10C pack that averages 5 or 6 C (12ish minute flight) but has bursts to 30C for a second at a time,.. say twice a minute,.. may live just fine, but if those surges go to 5 seconds it may not,...etc.

Gary Wright

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12-01-2017 01:42 PM  80 days agoPost 71
Richardmid1

rrProfessor

Leeds, England

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C ratings are a number that is not standardized. I have not found any industry "standard" that spells out the conditions under which the C rating is measured . . . let alone how long a pack can deliver that rating. The cut-off voltage used for that measurement is also a mystery. You may find that something closer to 3 volts is used. The internal resistance comes into play here.
I can't remember my exact sources but they're out there somewhere. Packs are tested down to 3v/cell and must deliver at least 80% capacity. If the load is too high the pack will hit 3v/cell before delivering at least 80% capacity.

Burst C ratings seem to vary (again read a couple of things on this which I can't find) from 4 seconds to 15 seconds. Standard Turnigy packs have a 15 second burst rating BUT their burst rating is not double the continuous rating as most packs are, those will be tested for less time. Turnigy also use ratings direct from the cell manufacturer.

60% of the time, it works every time!

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12-01-2017 01:47 PM  80 days agoPost 72
Richardmid1

rrProfessor

Leeds, England

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Try this:

http://jj604.com/LiPoTool/

Now im not sure how much truth is in it but going by IR it's very hard to find a Li-po that would be above 35C, if this is to be believed.

60% of the time, it works every time!

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01-14-2018 07:19 PM  35 days agoPost 73
mcfast

rrKey Veteran

Quebec Quebec Canada

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I got the 8000ma 6S 25C after all, at $47.00 plus free shipping, can't go
much wrong with that, we will see how it works out, I will keep you guys posted, just too cold right now -30C

P.S. sorry for the spelling or the grammar I am dyslexic!

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01-16-2018 03:14 PM  33 days agoPost 74
Richardmid1

rrProfessor

Leeds, England

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I will keep you guys posted, just too cold right now -30C
You might not want such long flight times in that temperature!

60% of the time, it works every time!

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