Internal Resitance Numbers
11-29-2004, 07:55 AM
#2
Tech Master
The lower the IR numbers are the more punch the pack will have. This works in conjunction with the voltage. A pack with high voltage and low IR will result in a very powerful pack.
11-29-2004, 08:00 AM
#4
Tech Master
Most matched packs are around mid 2 up to low 3. Anything lower would be better, anything higher would be bad.
11-29-2004, 11:05 AM
#6
If you look at individual cell values... specs for a batteries internal resistance from the manufacture of the cell (ie. sanyo) says between 1.2 and 3.7 milli ohms of resistance. The turbo matchers and other matching machines usually don't show the decimal point, so you may see 15 or 18 or 21 as the internal resistance value.
Wayne
Wayne
11-29-2004, 07:12 PM
#8
A 15 or lower IR would be good.
11-30-2004, 06:29 AM
#9
Actually, it's nothing to do with moving decimal points or anything of the sort. Actual and Relative IR are 2 different readings altogether.
Some matchers (myself included) use "Actual Internal Resistance", and readings should be, as someone else said, in the 2 to 3.5 range.
Some other matchers use "Relative Internal Resistance", which is a calculated number. (these are the IR numbers you see in the 10-20 range)
Both readings have their advantages and disadvantages. In both cases, the lower the better. Generally speaking, the higher volatage cells will have less IR than the lower voltage cells (of course there are always exceptions, but I am making a generalisation).
For example, on my current batch GP3300 cells, I'm seeing between 2.0 and 2.5 actual IR for my 1.175+ packs, and between 2.5 and 2.9 Actual IR for my 1.165+ packs - with 1.170+ packs somewhere in between.
Your mileage may vary.
-Scott
Some matchers (myself included) use "Actual Internal Resistance", and readings should be, as someone else said, in the 2 to 3.5 range.
Some other matchers use "Relative Internal Resistance", which is a calculated number. (these are the IR numbers you see in the 10-20 range)
Both readings have their advantages and disadvantages. In both cases, the lower the better. Generally speaking, the higher volatage cells will have less IR than the lower voltage cells (of course there are always exceptions, but I am making a generalisation).
For example, on my current batch GP3300 cells, I'm seeing between 2.0 and 2.5 actual IR for my 1.175+ packs, and between 2.5 and 2.9 Actual IR for my 1.165+ packs - with 1.170+ packs somewhere in between.
Your mileage may vary.
-Scott
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