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Batteries & Chargers Discuss Li-P, Li-Ion, NiMh, Nicad battery technology and the chargers that juice 'em up!

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Old 02-06-2014, 09:41 AM   #1
chuckinnc
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Default Internal resistance of different pack sizes

My IR Turnigy meter came yesterday and as usuall with no instructions, so a few questions.

Should the batteries be fully charged when measurring IR ?

If I had a 2S and 3S pack of the same current, would the 3S give better
(lower milliohm) reading?

If I had 2S - 2000ma and a 2S - 4000ma would the higer
current pack give better reading?

This is if all packs were new and same brand.
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Old 02-06-2014, 10:00 AM   #2
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Hi, Maybe this info might be of some help.

http://www.rcgroups.com/forums/showthread.php?t=1787777


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Old 02-06-2014, 12:53 PM   #3
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Originally Posted by chuckinnc View Post
Should the batteries be fully charged when measurring IR ?
IR does change quite a bit between discharged and fully charged. there is really no right or wrong way to measure it but try to always measure packs in the same charge state if you want to be able to compare results. Same thing goes for temeperature.
Originally Posted by chuckinnc View Post
If I had a 2S and 3S pack of the same current, would the 3S give better
(lower milliohm) reading?
No, if you are measuring total pack resistance then the 3s would be higher because the resistance of all cells is added together. If you are measuring individual cell resistance then it will be the same for 3s as 2s (or any other number of cells)
Originally Posted by chuckinnc View Post
If I had 2S - 2000ma and a 2S - 4000ma would the higer
current pack give better reading?
Yes, you would expect the 4000mAh battery to have around half the IR as the 2000mAh battery.. Note that the capacity in mAh (Milliamp-Hours) is a measure of charge capacity, not current as such.
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Old 02-07-2014, 01:05 AM   #4
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Originally Posted by chuckinnc View Post
My IR Turnigy meter came yesterday and as usuall with no instructions, so a few questions.

Should the batteries be fully charged when measurring IR ?

If I had a 2S and 3S pack of the same current, would the 3S give better
(lower milliohm) reading?

If I had 2S - 2000ma and a 2S - 4000ma would the higer
current pack give better reading?

This is if all packs were new and same brand.
FYI, some of those LiPo chargers such as the Cellpro line also include the capability of measuring individual cell resistances.

DennyV
Retired and the days are just too short, busier than ever!
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