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Old Feb 05, 2013, 04:08 PM
Chesterfield, MI USA
United States, MI, Chesterfield
Joined Apr 2011
48 Posts
Question
Lipo Resistance

What is considered to be the normal range of reistance on a Lipo pack?

What would be the upper limit of being safe and usable?

Thank You,
Chris
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Old Feb 05, 2013, 05:45 PM
Space Coast USA
hoppy's Avatar
Space Coast
Joined Oct 2000
20,692 Posts
Depends....
For instance, if your application has a low current draw power system, a lipo with a high IR will work fine. However, if the system draws high currents, low IR's are necessary.

This thread will give you a program for calculating the true C-rate of your pack based on it's IR and capacity. http://www.rcgroups.com/forums/showthread.php?t=1577989
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Last edited by hoppy; Feb 05, 2013 at 09:41 PM.
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Old Feb 05, 2013, 06:17 PM
A man with too many toys
United States
Joined Feb 2001
17,352 Posts
That depends on the battery size. I’m not sure but I think it’s proportional to the MAH capacity (if 5000 is 2 mohms than a 2500 would be 4 mohms).

Most of my large packs (5000 +) are in the 1 to 3 range when new. High C tends to have lower IR when new. I always record new IR for each pack when new. If the highest cell gets double of the low cell or 3 times the new IR than its time to toss the pack.

My smaller 2200 packs are typically in the 3 to 6 range. These are not expensive packs.


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