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LiIon, LiPo, NiCd & NiMh General General Battery Support |
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09-05-2015, 08:19 PM | #1 (permalink) |
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Join Date: Feb 2015
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High resistance lipo
Are there any issues for batteries that have a high resistance value? My 6s and 3s have low 20 to 30 resistance values but noticed that my two 3s pulse batteries have a resistance of 93 and 76. Thats a huge jump from my others. They aren't puffy and I really dont see any flight degradation when using them so I was wondering if I should be concerned w these values or just keep flying them as long as they aren't puffy and are still provided the power I need?
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Goblin 380 (Spirit), X3 (VBAR), DX9 (I.Y.A.O.Y.A.S.) |
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09-05-2015, 09:20 PM | #2 (permalink) | |
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Join Date: Feb 2015
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I use this guide from this HeliFreak post from redbird300:
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09-05-2015, 09:42 PM | #3 (permalink) |
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VERY dependent on size/capacity if lipo. Little 1s packs can have 100+ and be good.. a 3s2200 generally good is around 10-20.... 6s5000s good is 1-5.
Please post your full lipo information
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"It's not just a hobby... it's a lifestyle" - Pete ϟ MINNESOTA! Goblin 500 + 700 / SK540 / Jives / DX8 / Quantum / RJX servos / 306b / Deep cycles |
09-05-2015, 10:04 PM | #4 (permalink) |
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Nm, im not sure what happened bit I went ahead and plugged it in again to charge it and its only reading 31 for one and 26 the other for total resistance which is more of what I would have expected it to be around especially since theres packs have close to 100 plus flights on them. Thanks though guys!
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Goblin 380 (Spirit), X3 (VBAR), DX9 (I.Y.A.O.Y.A.S.) Last edited by alyon187; 09-05-2015 at 11:06 PM.. |
09-06-2015, 11:20 AM | #5 (permalink) | |
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Join Date: Sep 2008
Location: Smyrna, GA
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Quote:
The lower the mAh, the higher the resistance of a lipo will be and this is normal. A 5000 mAh pack might be good at 5 or under, but those value means absolutely nothing when it comes to smaller capacity packs as they will be much higher. Anyone notice that when you parallel charge, your IR magically goes down very low into single digits? Did the packs IR magically get better vs the values shown when charging them individually? Of course not! This is because you are increasing the capacity of the packs by combining them as one big giant high capacity battery and the charger sees it as such. Bottom line is you can only compare values of same capacity packs to each other, and that is only one variable of others that must be controlled Temp of the pack also plays a big part as well. A warm pack of any capacity will read lower IR than the exact same pack will when cooler, so there are variables that must be exactly the same or your values will appear to be all over the place from one measurement to the next on the exact same pack This is why your values came down, because charging it warms the pack over room temp and you likely tested it again after it had warmed up later in the charge cycle
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Tony Synergy 516, Gaui R-5 Speed (RIP), Cypher Vtol Jet (RIP), Spirit FBL, Hobbywing and Scorpion Tribunus ESC, Xnova motors. The girl in my DX9 tells them all what to do |
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09-06-2015, 12:36 PM | #6 (permalink) |
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Actually no, these batteries hadn't been on the charger all day and it was over 10 hours since they were flown. I plugged them in to start charging them and saw the resistance right off the bat so I stopped the charge and tried the other. Saw and did the same thing so I again stopped and then posted on here. After about 2 hours I decided to go ahead and charge them since they weren't puffy and were still providing me with plenty of power. Thats when I saw that the resistance was back down to where I thought they would be at. My charger isnt all that fancy. Its a replacement charger I got from hh after I had sent my passport 200w ac/dc charger in for repairs and since they dont make or carry that charger anymore then sent me a brand new dynamite passport ultra force 220 w ac/dc touchscreen that can measure the resistance of the whole pack, not individual cells.
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Goblin 380 (Spirit), X3 (VBAR), DX9 (I.Y.A.O.Y.A.S.) |
09-06-2015, 12:47 PM | #7 (permalink) | |
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Join Date: Sep 2008
Location: Smyrna, GA
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Quote:
Something is not right with your chargers stated IR values if they are changing randomly with the packs being tested at the exact same temp from one time to another. Maybe a poor or dirty connection contact between the battery and charger?
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Tony Synergy 516, Gaui R-5 Speed (RIP), Cypher Vtol Jet (RIP), Spirit FBL, Hobbywing and Scorpion Tribunus ESC, Xnova motors. The girl in my DX9 tells them all what to do |
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09-29-2015, 01:30 AM | #8 (permalink) | |
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Join Date: Oct 2014
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Quote:
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01-16-2016, 06:57 PM | #9 (permalink) | |
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Join Date: Sep 2013
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Quote:
A good 3S 2200mAh 40C Batterie should have an iR of <5 milliohm |
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