RunRyder RC
 7  Topic Subscribe
WATCH
 2 pages [ <<    <    ( 1 )     2     NEXT    >> ] 1399 views TOPIC CLOSED
HomeAircraftHelicopterMain Discussion › IR....AND....
11-28-2017 01:02 PM  6 months agoPost 1
rpat

rrElite Veteran

Weirton, W. Va.

My Posts: All  Forum  Topic

.....what is a good reading and what would be considered a bad rating for a pack. My charger tells me my internal resistance but I never really know what to make of it. Is there a cut off point to stop using them and why? Is the IR of a pack the same from small packs to large packs?

trex 700fbl cal30,minititan,, trx600fbl,trex250,logo 500,Velocity N2

PM  EMAIL  GALLERY  Attn:RR
11-28-2017 02:08 PM  6 months agoPost 2
EEngineer

rrProfessor

TX

My Posts: All  Forum  Topic

Is the IR of a pack the same from small packs to large packs
No, it's not....due to variances in the manufacturing and the chemistry.

Here's a link to some info(but not on the above):

https://rogershobbycenter.com/lipoguide/

Logo 600SXs, 800XX, TDR IIs

PM  EMAIL  Attn:RR
11-28-2017 02:18 PM  6 months agoPost 3
Pistol Pete

rrProfessor

Seffner, FL

My Posts: All  Forum  Topic

If you bought your packs in Utopia, they should read 0 ohms.

Otherwise, the closer to zero the better.

What I go by are:
0-5.... Great
5-10... Still OK
10-15.. Demoted to lighter duty, such as a scale bush plane
15 and up...strictly bench testing duty.

Your battery performance is based on the weakest cell.

The higher the IR, the higher the voltage drop, the higher the temp and the less current it can deliver.

IR varies by temperature. Try to take reading under same controlled conditions.

YMMV

Forgot I had this link...check it out.

http://jj604.com/LiPoTool/

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

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR
11-28-2017 02:23 PM  6 months agoPost 4
EEngineer

rrProfessor

TX

My Posts: All  Forum  Topic

Your battery performance is based on the weakest cell.
False.

Your battery pack's performance is based on the sum total of the IRs of the cells composing the battery pack.

Logo 600SXs, 800XX, TDR IIs

PM  EMAIL  Attn:RR
11-28-2017 05:05 PM  6 months agoPost 5
Richardmid1

rrProfessor

Leeds, England

My Posts: All  Forum  Topic

Cell IR depends on capacity, temperature, state of charge and age.

Don't worry about IR, just fly your heli till it no longer has the power to do what you want it to do then buy a new battery.

60% of the time, it works every time!

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR
11-28-2017 05:47 PM  6 months agoPost 6
ICUR1-2

rrElite Veteran

Ottawa, Ontario

My Posts: All  Forum  Topic

Richardmid1
Don't worry about IR, just fly your heli till it no longer has the power to do what you want it to do then buy a new battery.
Or until you notice the capacity drop. Keep track of the Mahs you put back in. It will drop over time.

spending time, paying attention

PM  EMAIL  GALLERY  Attn:RR
11-28-2017 06:10 PM  6 months agoPost 7
Richardmid1

rrProfessor

Leeds, England

My Posts: All  Forum  Topic

I always just check I'm still above 20% when I land. Simples.

60% of the time, it works every time!

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR
11-28-2017 07:29 PM  6 months agoPost 8
nappyroots2182

rrElite Veteran

Moline, il

My Posts: All  Forum  Topic

I check the IR on occasion to make sure a cell isn't going bad. But if the numbers are even and it's flying fine im good. If one cell IR is double the other cells or i see degrade in performance then i retire that pack.

PM  EMAIL  GALLERY  Attn:RR
11-28-2017 09:55 PM  6 months agoPost 9
Flyin for Jesus

rrVeteran

Troy, IL. 62294

My Posts: All  Forum  Topic

Richardmid1
Cell IR depends on capacity, temperature, state of charge and age.

Don't worry about IR, just fly your heli till it no longer has the power to do what you want it to do then buy a new battery.
This is how to do it.

Once a pack's performance isn't what you want, retire it or use it in something that doesn't draw as many amps. ( like a plank )

PM  EMAIL  GALLERY  Attn:RR
11-28-2017 10:43 PM  6 months agoPost 10
ICUR1-2

rrElite Veteran

Ottawa, Ontario

My Posts: All  Forum  Topic

Another way of monitoring them.
When you balance charge the lowest IR cell will reach 4.2 first. From there you can check how long it takes to balance. If I see a cell stuck at 4.0 -4.1 & the others are at 4.2 then I know it's soon time to buy more.

spending time, paying attention

PM  EMAIL  GALLERY  Attn:RR
11-28-2017 10:54 PM  6 months agoPost 11
Flyin for Jesus

rrVeteran

Troy, IL. 62294

My Posts: All  Forum  Topic

My Icharger starts balancing when the cell reaches 4.0v. All my packs are well balanced by 4.1v. ( also I charge at 1c so there is plenty of time to balance after 4.0v is reached )

Also, I believe the highest IR cell reaches 4.2 first though.

PM  EMAIL  GALLERY  Attn:RR
11-28-2017 11:12 PM  6 months agoPost 12
Heli Fanatix

rrVeteran

Fountain Valley, CA

My Posts: All  Forum  Topic

eengineer .... if you think the pack's performance isn't based on the weakest cells IR
- perhaps it's b/c you are the weakest link

Are you serious? Complete none sense.

If you got a nice Pulse 6S 65C pack
- all the cells are 1.0 ~ 1.5
- last cell is 20
- it's a bit chubby
- (1.5 x 5) + 20 gives us total IR of 27.5

vs

Pulse 6S 45C
- 3.0 ~ 5.0
- let's say all cells are 3.0
- 3.0 x 6 = 30

According to your statement
- the slightly puff pack will be better than the 45C good pack?

If that was a joke .. it's not close to being funny.

- Scott

PM  EMAIL  GALLERY  Attn:RR
11-28-2017 11:13 PM  6 months agoPost 13
ICUR1-2

rrElite Veteran

Ottawa, Ontario

My Posts: All  Forum  Topic

my bad, hadn't thought about the different brands of charger. I use mostly Hyperion and *Astro / blinky.

spending time, paying attention

PM  EMAIL  GALLERY  Attn:RR
11-28-2017 11:37 PM  6 months agoPost 14
pctomlin

rrVeteran

Texas

My Posts: All  Forum  Topic

If your pack is starting to puff and cell IR(s) are rising you are playing with fire literally. Good IR readings is specific to pack size with larger packs having lower IR values. A 5000 mah pack IR value can be retirement bad level where an 800 mah battery IR value is perfectly acceptable.
Revolectrix has an excellent charging package where individual cell data can be tracked and monitored during charging, the Bump Controller and a tablet take it to another level.

PM  EMAIL  GALLERY  Attn:RR
11-29-2017 12:39 AM  6 months agoPost 15
EEngineer

rrProfessor

TX

My Posts: All  Forum  Topic

According to your statement
- the slightly puff pack will be better than the 45C good pack?
If that was a joke .. it's not close to being funny.
I didn't post that....you made that up....why?

Why did you say I posted that?

That's a lie!

Logo 600SXs, 800XX, TDR IIs

PM  EMAIL  Attn:RR
11-29-2017 12:42 AM  6 months agoPost 16
EEngineer

rrProfessor

TX

My Posts: All  Forum  Topic

Did you even bother to read what I posted?

Before you chose to lie about what I posted....

Your reading comprehension seems to need work tonight.

Does your issue have anything to do with the fact that not
too long ago, you were going to charge somebody to help them.

And when I posted that "Your battery pack's performance is based on the sum total of the IRs of the cells composing the battery pack."....It was contrary to what you told the guy you charged for helping...

How did that work out for you?

Were you able to make some money?

BTW, your math example was flawed....you made the false assumption that each cell had exactly the same IR.....in reality, that's not the case.

No matter, as you didn't get the point.....the sum total of the IR of each cell determines how much current can be sourced by that pack.

Logo 600SXs, 800XX, TDR IIs

PM  EMAIL  Attn:RR
11-29-2017 06:54 AM  6 months agoPost 17
Heli Fanatix

rrVeteran

Fountain Valley, CA

My Posts: All  Forum  Topic

eenginer ....on post 4, regarding your comment:

"your battery's performance is based on your weakest cell"
- you said, "False"

I was just re-alliterating in best case IR scenario in a different way to supporting your comment
- its given that IR's vary between cells, temp, state of charge, etc
- IR is not the only determining factor as to the health of the cell

BTW
are you still on dial up? a bit slow eh?

I don't ever charge anyone for help, if they did .. Let's see screenshot of a PM stating that?

I know for a fact I said this:

"If you pick up any of my items I offer.. I provide 100% support to what I offer along with anything else I may know if you need help on the matter" That is I do for my buyers

I'm not interested in charging for information or lessons. Anyone that's been in the hobby long enough knows you can't make money in this hobby. I've been in this hobby since 91' and is self invested in this hobby.

Ever heard of Goggle? Only bad thing about it that they find threads and post like this topic and get mis-INFORMED

Remember:
- when you used to not know what "free wheeling was"
- when there was a line across your screen name?

This is another topic you're are passing out mis-information again

I HAVE NEVER supplied any mis-information. you are all over the place. some spot on and some are over the coo-coo's nest!

it's OK to admit when you are in-accurate instead of poking holes.

- Scott

PM  EMAIL  GALLERY  Attn:RR
11-29-2017 08:52 AM  6 months agoPost 18
EEngineer

rrProfessor

TX

My Posts: All  Forum  Topic

Have a few more beers...and you can find somebody else to bitch at...

Logo 600SXs, 800XX, TDR IIs

PM  EMAIL  Attn:RR
11-29-2017 09:00 AM  6 months agoPost 19
EEngineer

rrProfessor

TX

My Posts: All  Forum  Topic

Ever heard of Goggle?
Yes, I've heard of goggles.

What does swimming have to do with this subject?

Jeez...find somebody else to troll.

Logo 600SXs, 800XX, TDR IIs

PM  EMAIL  Attn:RR
11-29-2017 12:29 PM  6 months agoPost 20
rpat

rrElite Veteran

Weirton, W. Va.

My Posts: All  Forum  Topic

Well....I haven't had any pop corn in a long time on here.............sounds like I gotta get out the old pop- a- matic again.

On another note, I am going to have to start watching the IR readings on my packs. I have been like just about every one else, when the pack starts to not perform then it gets tossed.

trex 700fbl cal30,minititan,, trx600fbl,trex250,logo 500,Velocity N2

PM  EMAIL  GALLERY  Attn:RR
WATCH
 2 pages [ <<    <    ( 1 )     2     NEXT    >> ] 1399 views TOPIC CLOSED
HomeAircraftHelicopterMain Discussion › IR....AND....
 Print TOPIC  Make Suggestion 

 7  Topic Subscribe

Sunday, June 24 - 6:20 am - Copyright © 2000-2018 RunRyder   EMAILEnable Cookies

Login Here
 New Subscriptions 
 Buddies Online