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06-27-2019, 03:36 PM | #1 |
Quarry Creeper Join Date: Aug 2018 Location: Toronto, Canada
Posts: 430
| Was finally able to test the internal resistance of my LIPO's
Having had a problem with one of my lipo's, I decided to get a tester to see what the IR of each cell is. Here's what I've got:
Are there any that look concerning? One of these batteries gets warm/hot when charging (and one of the cells always lags behind), and one came with a used truck (haven't even used it yet). All of these are at storage voltage. |
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06-27-2019, 04:13 PM | #2 |
Quarry Creeper Join Date: Dec 2016 Location: Cawston, British Columbia, Canada
Posts: 478
| Re: Was finally able to test the internal resistance of my LIPO's
#5, 142 milliohms (IR is always measured in milliohms) is way too high. I'd retire that battery immediately. The rest are in pretty good condition. Anything less than 10 milliohms is in excellent used condition. Personally, I won't use a lipo if any cell is over 20 milliohms. |
06-27-2019, 04:27 PM | #3 | |
Quarry Creeper Join Date: Aug 2018 Location: Toronto, Canada
Posts: 430
| Re: Was finally able to test the internal resistance of my LIPO's Quote:
But the 3 cell is having issues - heating and cell one always takes hours to catch up to the other two cells. Venom said it should go because of the heat and I'm in agreement. Even with a batsafe I don't trust this battery. | |
06-27-2019, 05:20 PM | #4 |
I wanna be Dave Join Date: Jun 2017 Location: Humboldt county
Posts: 4,482
| Re: Was finally able to test the internal resistance of my LIPO's
I wonder does the size or capacity play a role in this? All of my small batteries (850 mah and less) have terribly high IR even a pair of brand new ones, they're up in the 80's to 100's.
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06-27-2019, 05:53 PM | #5 |
owner, Holmes Hobbies LLC Join Date: Nov 2004 Location: Volt up! Gear down!
Posts: 20,290
| Re: Was finally able to test the internal resistance of my LIPO's Yes. A 1000mah cell will have twice the IR of a 2000mah cell if both are equal discharge rate, factory, chemistry, etc.. Teeny cells have high IR by the nature of things.
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06-27-2019, 06:30 PM | #6 |
Quarry Creeper Join Date: Aug 2018 Location: Toronto, Canada
Posts: 430
| Re: Was finally able to test the internal resistance of my LIPO's All the lipo packs I have on that list are 5000mah and used in 1/10 trucks. I haven't tested any of my smaller packs, but it's good to know there will be a difference in what I should expect.
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06-27-2019, 06:39 PM | #7 |
I wanna be Dave Join Date: Jun 2017 Location: Humboldt county
Posts: 4,482
| Re: Was finally able to test the internal resistance of my LIPO's |
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