How To Measure Battery Internal Resistance
HTML-код
- Опубликовано: 6 фев 2025
- See how to easily measure battery internal resistance when making battery packs, or for evaluating the condition of rechargeable batteries. Enjoy the video!
*Other great videos:
Low Cost Arbitrary Function/Waveform Signal Generator:
• LOW COST Arbitrary Fun...
High Rated/Low Cost (ESR)component tester & Power Supply unit:
• (2) Very Good/Low Pric...
*Link to Internal Resistance Meter shown in this video*
(Tester may come with the plastic case shown in the video or a compact padded zipper case)
s.click.aliexp...
Amazing low priced FLASH DEALS:
bit.ly/1VyAQFO
Your purchase supports my channel.
Thanks For Watching!
Support the creation of more electronicsNmore videos:
www.paypal.com...
**If you enjoy watching my videos, please show your support by SUBSCRIBING, POSTING LINKS to my videos on other websites & blogs, rating a "THUMBS UP", and watching my video playlists. Doing so helps to ensure that many more videos will be released in the future. (Views are essential to ensure this channel remains in an active state)**
I find a several videos regarding impedence testing. However,. What values range from test results would be acceptable for 18650 cell. For example,. Less than 50,. Less than 100,. Thanx
Thanks for the review.
I think the Ohm/Volt ranges are not correlated to the battery voltage, that is you can choose the best Ohm resolution regardless of the battery voltage.
For example on the Nicad battery pack you could have chosen the 200mOhm and got a precise result instead of just 0.04 Ohm.
Or am I wrong?
+shlomsi2000
Hello. No. The lower range switch shows settings for the battery voltage. Make sure the correct range is chosen. .04 ohm = 40mOhm. Thanks For Watching!
That's wrong. Even in the manual you showed, it's clearly described that for impedance measurement, you first chose the smallest Ohm range for detailed measurement. Only if it shows "1", you go to the next range and so on. As long as you are working with voltages the instrument is made for, you only have to consider the voltage range when you are in voltage measurement mode. Even that is clearly described in the manual.
Why we cant use normal multimeter.please reply
would this work for nickel-metal hydride modules, (prius )
to check the internal resistance
Testing internal resistance while connected to other batteries might work on a 1 pole but not after that then you are reading multiple batteries at once. Like a 3s4p your readying all 4 batteries ohms together in parallel which would give you a false reading.
I was testing one cell that was in series.
Actually AC Impedance is different from DC resistance. "What the user needs to know is the DC series resistance, because DC is what flows through the cells. Manufacturers specify impedance at 1 kHz because test equipment to measure it is readily available." liionbms.com/php/wp_resistance_vs_impedance.php . There is a correlation between AC impedance and resistance DC, but the interval is big. If you have 1 mΩ AC impedance at 1 kHz, DC resistance is anywhere between 0.5 and 5 mΩ.
That is a full order of magnitude, and not very helpful to determine if a cell is appropriate for an application.
Good to know
I learned a hard lesson on the 1st flight of my new rc plane.......CRASH near the ground, as I lost all control at the 5 min mark of flight and I was very close ( range wise ) .....I was using a very old 3S 2200mah LiPo....pretty sure the ESC went into LVC, although after checking the battery after the crash it showed voltage was 3.80 per cell ........I am now searching for a simple way to check IR in all my LiPos .......the meter in this video has been discontinued, why?....thanks
Thanks for that
You're welcome!
I have AA and AAA Eneloop batteries that I want to test. Does anyone know at what level reading a battery would considered to be trash?
Check out battery university online.
Nice, I definitely need one of those! Have you done any videos on lead-acid batteries? I've heard about people reviving or restoring them and about converting them to alum batteries but I haven't done it myself! Thanks
I have a video showing something that I did to a bad 12V lead acid battery. Thanks for watching!
I guess I am quite randomly asking but do anybody know of a good place to watch new series online?
@Makai Boone Flixportal =)
@Zechariah Kenneth Thank you, signed up and it seems like they got a lot of movies there :D Appreciate it!
@Makai Boone Glad I could help xD
Great Video ! I have a question to ask if we have 20 cells in a battery and each cells give 0.02 resistance but only 2 cells give reading of 0.03 each so as they are quite equal shall we consider them bad cell because the other cells gave the reading of 0.02?
Not too far off, likely OK, but ideally you'd want to have all the cells the same. Thanks for watching!
electronicsNmore thank you so much !
what is better? to match by esr or by capacity? (aka coulomb counting)
I mean the construction will be quite similar so those two will correlate quite closely but in theory which one is the best?
Hello. There is a relationship between battery internal resistance & capacity. Lower IR = Higher current output/capacity.
@@electronicsNmore you did not answer his question
Hi, nice video .this tester work for test toyota hybrid battery modules? If not you can recommend me one please thanks
If testing individual lithium ion batteries, then yes.
@@electronicsNmore thanks , my modules are nickel metal how I test the internal resistance in an easy way?
OK, I think those modules are around 7.5V each. There are more than likely (6) 1.25V NiMH cells connected in series, then many more like those are connected in parallel in each module. I would check each bundle in each module.
@@electronicsNmore yes almost ... 7.2V nominal (6) 1.2V and in my case 28 connected in series. What's the easy way to know the internal resistance of each modules? . Is a TOYOTA prius hybrid battery thanks again
10:00 holding negative probe correctly but not positive one.
00:51 ...🙊!
Is there any reason one could not use this meter on an alkaline battery? (especially if one is into recharging them, e.g. as per your circuit for doing this, or with other purpose-designed charger)
You can use this with all battery types. Thanks for watching!
Hi and thank you for the video. Would it be possible (and wise) to test a 3p group of cells in a pack without disconnecting them? I have a 20s3p battery pack (same cells) that I'd like to check if the groups in series are going out of balance. Also I happen to have access to used cells of the same kind that I can swap out. I'm just trying to figure out a strategy of servicing the pack. Cheers!
You need to test each battery by itself.
How much does temperature and state of charge impact the internal Resistance measurement?
IR goes lower as temp rises, and it's lowest when the battery is at full charge. The range varies.
Cool , Well done.
Thanks! Be sure to check out my video playlists, rate thumbs up, and share my channel with others.
The internal resistance varies depending on the chemistry , but your tester is showing 0.04 for both NIMH ( or NICD ) and lead acid batteries. Surely that is not right ??
If the batteries were new, you'd be correct. I used new and old batteries.
If the batteries were new, you'd be correct. I used new and old batteries.
Thank you for reply, much appreciated. So after 8 months, you still have this model and have used continuously . Can you still recommend this model or would you recommend another?
Hi, congrats for the video. What’s the difference between this device and an ordinary multimeter which also has a Ohms measure range? Another doubt.... if you measure bunch of 18650 cells and get close values of resistance something like 300mAh or little bit more of capacity between them, it would be good to put they together to work?
Other thing :]] Is there a table with average resistance values of good cells, medium quality and almost dead cells to help to interpret the results ? Thank You!
Hello. Only a device like this can be used to measure internal resistance. The device in this video uses a specific frequency for testing internal resistance. Much more info and tables can be found online.
Got it! And in the following scenario: I have 5 18650 cells with very similar internal resistance but capacities that vary 300mAh or a little bit more beetwen them, would it be appropriate to mount a pack with them both in series or in parallel?
With the YR 1035 milliometer tester I measured the internal resistance and voltage of numerous rechargeable batteries that I had finished recharging. I wanted these conditions to see the parameters at full charge of all the batteries. I noticed that some of the same make and model have almost the same voltage (varies by a few millivolts) but different values of internal resistance (sometimes even double and triple). This is because some batteries are old, others partially new and others new (an older battery has a higher internal resistance).
So the data I have are: internal resistance and voltage at full charge but without load connected to the battery. With these data with which calculation is it possible to know the real charge in Ampere available to the battery? To give an example: two identical batteries measure like this:
batt1: 1,2806 volt and 0,0227 Ohm (or 22,7 mOhm)
batt 2: 1.3204 volt and 0.0216 (or 21.6 mOhm)
How many amps does one and the other battery have inside? Thank you
The meter doesn't show battery capacity, only internal resistance.
set speed to 1.25x, You're welcome
That's fine.
hello, can NI-MH resistance be measured?
Yes
@@electronicsNmore thanks
Minimum value measurement 1mOhm for a 3.2-12v battery? Can it metering like 0.8, 1.2, 3.2mOhm or only 1, 2, 5, 10 mOhm? Is it possible measure up to tenths of a mOhm Do you compared accuracy with other measuring devices? Thanks.
The unit works extremely well considering the low price. If you require very high accuracy readings, then you'll need to spend A LOT more money. Thanks for watching!
8:29 holding probes in wrong way.
I did it for a reason, the probes are very "touchy". The position I showed gave a stable result. The design has been modified for the newer versions.
Good
Glad you enjoyed the video! I have a lot of excellent videos on my channel that cover many different subjects, so be sure to check out my extensive video playlists for other videos of interest to you, rate thumbs up, and share my channel with others. Thank You
I used this meter on about 200 18650 batteries. The reading is always within 40-70. The one I built myself has a much bigger range on it. Not too sure I trust this thing.....
+joblessalex The meter is fairly accurate. Others online have tested the accuracy using other methods. :-) All the "good" cells test in that range, all the cells that have increased resistance will be well over 100mohm
+electronicsNmore Odd.... I have some pretty much internally shorted cells and they show the same as a good one. If I load test them though, the resistance is at a much higher number. Load testing them for me gives 150-200 as good and 400+ as bad. The load tester seems to actually read the crappy ones for me.
joblessalex
Maybe yours is faulty. You made one with the 8 ohm resistor?
+electronicsNmore I did a 3 ohm across the 3.6v battery, about an amp load. Measure the voltage unloaded, load it for about 10 seconds, then measure loaded voltage. Voltage unloaded - voltage loaded * resistance / voltage loaded. It gives you a reading and it varies pretty wildly.
Load testing works good, but using a tester like this is much easier.
ELECTRONICSNMORE,
////// //// Eric Johnson is saying that overdrive & fuzz guitar pedals that take batteries will sound different when using different types of 9volt batteries NON-Rechargeable 9 volt batteries like Alkaline, Carbon zinc, Lithium, Mercury because of the DC resistance of the 9 volt battery.
The sound will be different if you use an Alkaline, Carbon zinc, Lithium, Mercury battery each will sound differently because of the batteries DC resistance
1.) Why does each 9 volt battery type Alkaline, Carbon zinc, Lithium, Mercury have a different battery DC resistance? Why different battery types will have a different DC resistance compared to another battery type, any reasons why? Yes I know that the batteries DC resistance will drop the 9volts when the guitar pedal is drawing more current but what Eric Johnson is saying is that 9 volt Alkaline, Carbon zinc, Lithium, Mercury will have a different DC resistance which will drop the 9 volt down differently when the overdrive or fuzz pedal is drawing more or less current.
Should be accurate naming things. Cells are not batteries. A group of cells wired together is a battery.
First, don't be a pedant, second, when you buy a replacement lithium polymer BATTERY for your phone(usually 3.7v nominal), or other devices, yes, it's called a battery, not a replacement cell. I suggest you read product labels.
milli-ohms ? Megaohm yeah ?
+Aine Leon
Hello. The readings are in either milliohms or ohms. Thanks For Watching
why could a person not just use a DVOM ?
Not designed for testing internal resistance. You need a specific testing frequency.