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Old Aug 04, 2014, 11:01 AM
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United States, FL, Gulf Breeze
Joined May 2006
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Any chance of getting one to do the 10000 to 22000ma 6s packs.

Reason i ask is because i am getting ready to buy a lot of batteries for a 1300mm Heavy Lift Octo i have.
Lot of guys are buying the 10,000 / 16,000 / 22,000 batteries for them.

After reading a little here i am wondering if i should just buy 5000ma packs and use 1 or 2 or even 3 or 4 to achieve what job calls for.

With having lost a lot of money on lipo's over the years i feel this is a great tool for people like me who do not have a lot of money and want to stay on top of there batteries.
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Old Aug 04, 2014, 01:38 PM
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Canton, Michigan USA
Joined Jul 2007
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Quote:
Originally Posted by Ermilo View Post
Tks nice metaphor
Yes, you really want some "headroom" in ESCs and batteries.

Rule for Lipos and ESCs

Buy ESCs and Lipos that have 20% headroom minimum. And, I might add, lipos tend to be over-rated so consider 30 to 40% of headroom.
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Old Aug 04, 2014, 03:38 PM
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Rugby, UK
Joined Feb 2007
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Quote:
Originally Posted by gtxkid View Post
Any chance of getting one to do the 10000 to 22000ma 6s packs.

Reason i ask is because i am getting ready to buy a lot of batteries for a 1300mm Heavy Lift Octo i have.
Lot of guys are buying the 10,000 / 16,000 / 22,000 batteries for them.

After reading a little here i am wondering if i should just buy 5000ma packs and use 1 or 2 or even 3 or 4 to achieve what job calls for.

With having lost a lot of money on lipo's over the years i feel this is a great tool for people like me who do not have a lot of money and want to stay on top of there batteries.
The meter will read packs of any capacity. Although I initially specified a max of 6000mAh this was based on the thinking that the measurement pulse of 16A was well below the likely working current of very large packs. I experimentally built a higher current version using a 32A measurement pulse but found that the results on very large cells were within 1% of the standard 16A version so that the considerable extra expense was not worth it.
You can confidently use it on large lipo packs of any capacity but you must respect the 6S cell limit.
There is also a Hi Resolution version, using a 25A pulse and capable of a cell IR resolution of 0.0.01 milliohms as against the standard unit's 0.04 milliohms. The downside is that the maximum cell IR range is 0 - 8 milliohms so that it is not suitable for cells of under about 2600mAh.

Wayne
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Old Aug 04, 2014, 04:45 PM
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Quote:
Originally Posted by Wayne Giles View Post
The meter will read packs of any capacity. Although I initially specified a max of 6000mAh this was based on the thinking that the measurement pulse of 16A was well below the likely working current of very large packs. I experimentally built a higher current version using a 32A measurement pulse but found that the results on very large cells were within 1% of the standard 16A version so that the considerable extra expense was not worth it.
You can confidently use it on large lipo packs of any capacity but you must respect the 6S cell limit.
There is also a Hi Resolution version, using a 25A pulse and capable of a cell IR resolution of 0.0.01 milliohms as against the standard unit's 0.04 milliohms. The downside is that the maximum cell IR range is 0 - 8 milliohms so that it is not suitable for cells of under about 2600mAh.

Wayne

Wayne,

So you can use it on any cell to measure IR, but never more than 6 cells to measure pack IR.

Bill
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Old Aug 04, 2014, 06:46 PM
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Rugby, UK
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Originally Posted by Prof100 View Post
Wayne,

So you can use it on any cell to measure IR, but never more than 6 cells to measure pack IR.

Bill

Bill,

The only limitation on the size of the cell is at the bottom end ie on very small cells. The 16A pulse represents 32C for a 500mAh cell although it is OK for cells down to 300mAh (53C) as the pulse is only 15mS long so will not cause damage.
If the pack voltage falls below 7V during the load pulse, which can happen on small or very weak 2S packs, the reading may be erroneous.

The number of cells is always limited to 6 maximum as the pulse is taken from all the cells in series, even for Cell measurements, so the internal electronics has to dissipate 400watts during the measurement pulse on a 6 Cell pack.

Wayne
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Old Aug 07, 2014, 04:52 AM
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Pack ESR

Post retracted as question is now solved.
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Old Aug 10, 2014, 01:40 PM
aka JetMan Joe
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Quote:
Originally Posted by Wayne Giles View Post
.... There is also a Hi Resolution version, using a 25A pulse and capable of a cell IR resolution of 0.0.01 milliohms as against the standard unit's 0.04 milliohms. The downside is that the maximum cell IR range is 0 - 8 milliohms so that it is not suitable for cells of under about 2600mAh.

Wayne
Wayne, I would like to purchase the high res version. Since I typically only measure 6S 5000's and up it's been hard to realize much differentiation when packs are uniformly warm (short of an outright failure). I'm thinking it might be a good thing to develop an IR degradion curve along with the capacity curves during my up coming life cycle test series. Maybe track the average IR of the 6 cells or the highest value cells' reading.

Joe
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Old Aug 10, 2014, 02:36 PM
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Rugby, UK
Joined Feb 2007
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Hi Joe,

Thanks very much for your enquiry.
Sounds a good idea to track the IR of the cells on each pack. The obvious problem is temperature variation as the differences you are trying to track will be small.
Do you have a temperature controlled enclosure to enable you to bring the packs to a closely controlled temperature of, say, 70*F. (21*C)? If not you can knock one up very cheaply from a small drink cooler and a cheap temperature controller.

Will be interesting to see when they peak as I find that the IR of all packs fall initially but then start s to rise as the pack ages. Some packs have only fallen after the first cycle but others fall for the first 3 or 4 cycles.

I will build a Hi Res meter this week and let you know when it is ready for despatch.
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Old Aug 10, 2014, 05:54 PM
aka JetMan Joe
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Thanks Wayne! I'll look forward to receiving it. I probably won't start testing for a good month as the flying (and repair) season is in full swing here.

My thermal chamber is a double walled tube vented to the outside with a fan blowing through the open end to provide air flow over the pack while it's cycling. My thinking was to do the IR check after every 25 charge/discharge cycles when I do the capacity check. Then all the packs would be on a common playing field so to speak when they are measured.

Joe
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Old Aug 17, 2014, 03:05 PM
who dares wins
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London,England
Joined Apr 2005
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Hi Wayne,
How many versions do you now make?

My original unit is still going strong. The best tool in my electric flight box!

Cheers
Alex
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Old Aug 17, 2014, 04:35 PM
The 6 P principle works for me
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Ventura CA
Joined Aug 2007
980 Posts
I have had mine for just over 2 years now and while I use it a lot and I show other people how it works and what the numbers mean it is only recently that others are asking to have their batteries checked. Many people still just check the voltage and then fly. When they have issue with the battery not working well the usual comment is "I don't understand whats happening, I fully charged it before I used it" It seems that having a "good tool" is nice, understanding what it does, that's nice also however, understanding what makes lipos tick is....................different from just putting fuel in a tank! Oh well, one can lead a horse to water but, you can't make him drink! Michael
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Old Aug 17, 2014, 05:14 PM
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Rugby, UK
Joined Feb 2007
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Alex,

Glad to hear your meter is useful.

There are four types although three are just varaitions of one design.

Only the Single Cell unit is a different design as it is a dedicated unit intended for measuring small single cells of 30 - 1000mAh.

The other three types are the original unit and two variations.

Standard unit is for measuring 2 - 6S packs of 500mAh and up. Resolution is 0.04milliohms

Modified 1S - 6S. version has the same spec. but can measure single cells.

Hi -Res version can measure 1S - 6S packs 2000mAh upwards with a resolution of 0.01milliohms but really is a specialist unit as the max cell reading is only 8milliohms and the max total pack reading is 65milliohms. It is intended for competition users.

Hope that clarifies it.

Wayne
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Old Aug 18, 2014, 01:21 PM
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United States, FL, Gulf Breeze
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637 Posts
Does it happen to be in on of the icharger's.
Be Cool if the charger had this option.
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Old Aug 18, 2014, 05:07 PM
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Rugby, UK
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Quote:
Originally Posted by gtxkid View Post
Does it happen to be in on of the icharger's.
Be Cool if the charger had this option.
Sorry, I don't understand the question.
Can you clarify it

Wayne
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Old Aug 18, 2014, 05:21 PM
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United States, FL, Gulf Breeze
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Quote:
Originally Posted by Wayne Giles View Post
Sorry, I don't understand the question.
Can you clarify it

Wayne
Is there a charger that has it integral in one of the i-chargers.
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