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LiIon, LiPo, NiCd & NiMh General General Battery Support |
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02-03-2016, 08:56 PM | #1 (permalink) |
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New batteries/charger with high Internal Resistance
Ok so I initially saw the post everyone refers to that states a good battery is 0-5ohms, decent is 10-20 and above 25 sucks. I just read Xrayted's post in this thread: https://www.helifreak.com/showthread.php?t=711874.
I fly small helis and all of my batteries are tiny, mostly being 300-950mah. I just recently got my biggest batteries yet, 2200mah 3s. I got the Hitec X2 recently and when I first got it I used it to check the IR of some batteries. They were all very high. Most of my batteries are around 20-30ohms, and the lowest from a brand new battery was 10ohms. I figured there must be some resistance in the wires, or the Hitec X2 has a poor resistance meter. I think the one at 10ohms was 950mah. Yesterday I got my shipment of Gens Ace batteries, and their 450mah ones not only had a low voltage (3.75v, not huge but I have never had a brand new battery under 3.8v) but a high internal resistance as well. These packs are measuring 20-30ohms brand new. Before a single charge and after their first charge. I tested a 2200mah pack today, not only are the voltages on point out of the box (3.82-3.83), but they also have 1-5ohms. I believe Xrayted has pretty much solved the mystery for me, both about the Hitec X2 having a decent IR meter and why almost all my batts have high internal resistance. I still felt like writing this up and posting it though so I could get some feedback on the Hitec X2 (if it does in fact have a good IR meter or not) and just ease my worries that my 450mah batts are in normal condition, arriving at 3.78v and 20-30ohms. Initially I had the belief that the 2200mah batts were recently manufactured (had to wait until Jan 30th for them to ship) and the 450mah batts were manufactured years ago and had been sitting in storage. Now from what I have read I am pretty sure that isn't the case, but I'd like some reassurance from someone more knowledgeable on batteries.
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Blade mCX2> 120 SR> Nano QX> Nano CP X> 130 X> 180 CFX> 200 QX> TREX 450> 230 S> mCPX BL> Nano CPS |
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02-03-2016, 08:58 PM | #2 (permalink) |
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Are these packs broken in? IR's drop to their lowest at around 10 cycles.
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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 |
02-03-2016, 09:09 PM | #3 (permalink) |
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Ahh ok, that was another possibility I considered that I might be overlooking. No these packs are not broken in, they are brand new. I tested them after their 1st cycle on the charger and after their 2nd cycle.
Well the packs I mentioned initially (not the new shipment of Gens Ace) are on at least 20 cycles, but they also are at least a year old and they haven't been flown in half a year.
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Blade mCX2> 120 SR> Nano QX> Nano CP X> 130 X> 180 CFX> 200 QX> TREX 450> 230 S> mCPX BL> Nano CPS |
02-03-2016, 09:20 PM | #4 (permalink) |
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Brand new are always higher IR and often not well balanced. I always cycle 5 times on the charger before I even fly them.
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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 |
02-03-2016, 09:43 PM | #5 (permalink) |
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Ok for sure. Yeah I also cycle my batteries 5 times on the charger too, they are on their 3rd cycle now.
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Blade mCX2> 120 SR> Nano QX> Nano CP X> 130 X> 180 CFX> 200 QX> TREX 450> 230 S> mCPX BL> Nano CPS |
02-05-2016, 12:54 PM | #7 (permalink) |
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Join Date: Mar 2014
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Couple other things to think about:
The IRs will read differently based on whether the pack was flown recently (within an hour or so), the temperature, and the load on the cell used to test IR. So you want to try to get those to be consistent as much as possible to compare two batteries. Also IRs don't always perfectly correlate to noticeable power deltas. It is a proxy that is somewhat easy to measure, but not perfect.
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Goblin 700 w/vBar, Gaui X5 w/vBar, TRex 450L w/AR7200 BX, Dx9. Retired Helis: Blade 300x, Nano CPX, MCPX-BL, Nano QX. |
02-06-2016, 09:06 PM | #8 (permalink) | ||
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Quote:
Overall the X2 is nice, but not great. I would recommend it only if you are like me, and you use a lot of lower capacity batteries (300mah-950mah) and want to be charging more than 1 at a time, without having a parallel board setup. Keep in mind though, that you CANNOT set your discharge voltage (well you can, but only 3.0v-3.3v, which isn't a large enough parameter to be useful). So when you are cycling batteries, you will have to manually stop it at 3.7v, or let it go to 3.3v or the storage 3.8v. Basically if you fly minis and micros only and don't care to auto-cycle, I'd recommend it. Otherwise no. My next charger will not be a Hitec, it will be an iCharger or CellPro. One last thing, the Wifi Module and program really suck. It has very limited use and turns your charger into a cheap crappy one. If you do get a Hitec, don't waste your money on the module. Quote:
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Blade mCX2> 120 SR> Nano QX> Nano CP X> 130 X> 180 CFX> 200 QX> TREX 450> 230 S> mCPX BL> Nano CPS |
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