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@dinhphu94 Ай бұрын

Now 2024, let's upgrate it to 1800 lumen

@megasyxx 3 ай бұрын

Awesome! Thanks for sharing

@LividDestruction 5 ай бұрын

I use V1 - V2 = V3 V2 / R = I V3 / I = Ohms IR Ohms * 1000 = milliOhms . 12.66V1 - 12.36V2 = 0.30V3 voltage drop 12.36 v2 divided by 120ohms resistance or load = 0.10 I amp draw. 0.30V3 voltage drop divided by 0.10 I amp draw = 2.8691 Ohms internal resistance or 2869.13milliohms. I couldn't find the internal resistance of your exact battery but similar models like the UB1222 have an IR rating of 80milliOhms. Those batteries are showing there age.

@twanakawa5551 6 ай бұрын

Great video

@Tanjattr 8 ай бұрын

Hi sorry for replying late🥰 what's your email address?

@mike-yp1uk 8 ай бұрын

Wow never seen a better demonstration. Awesome

@simonilett998 10 ай бұрын

Interesting. Interchanging current, watts and voltage all in one video...glad I know the difference or it might've really confused me🤣

@jeffm2787 11 ай бұрын

Voltage should be measured at the battery terminals, The resistance for the load should factor in the leads that were used. The resistance of the load will change slightly due to heating. Outside of that close enough to get reference measurements compared to the others.

@satishmore2600 Жыл бұрын

Hindi me bolo bhai

@oephaim4034 Жыл бұрын

Thank You so much

@naveebisrael Жыл бұрын

Hi Is a hi ressist is bad ? How mucu sold be a resistens of a 12 v battery ? Thenks.

@1thehandyvan Жыл бұрын

I’ve also done this upgrade about five years ago, and still impressed with it now in 2023

@safiullah3834 Жыл бұрын

nice video. What if we connect some batteries in series like two in series? Can you calculate the internal resistance of each cell for the series combination?

@wholland3484 2 ай бұрын

Well you could do the same, measuring at the terminals of battery 1, and after of battery two, and then connect a known load, then measure voltage of batt 1 and then batt 2. However I think it will be a little bit less accurate. But certainly possible to get a general idea.

@moefuggerr2970 Жыл бұрын

You made changing a flash light bulb last 6 min long. Lame.

@hustlaz2k 2 жыл бұрын

its too high IR for a SLA batt.. i think something is wrong...

@adrianotero7963 2 жыл бұрын

Another great upgrade is to use a Cady that will hold regular AA batteries....say like energizer lithium....guaranteed not to leak.....are lighter and are easier to find.....or just use regular eneloops that you can recharge.....

@hitendrasapariya900 2 жыл бұрын

Good

@piclife1178 2 жыл бұрын

Assuming you don't have one shorted cell in that battery, the reason your good battery limits to 12.03V when charging is probably because it is trying to draw a high initial charge current and your converter/regulator has gone into current limit. Typically a good lead acid / SLA, battery with the low internal resistance will pass a high initial charge current and then increase in voltage slowly as it absorbs the charge. A bad battery gets up to voltage too quickly with a low current. I am surprised how high the resistance is for all of your good batteries, did you say about 2.5 ohms(?) I guess you are using them at very light load as with an internal resistance of about 2.5 ohms you be loosing 6v in the battery for a load of only 2.4 amps.

@Xxxcappie23 2 жыл бұрын

Do you need to put a resistor on the battery to calculate the internal resistance. Can't you just put the meter in Ohms scale and find the internal resistance of the battery ?

@ΠάριςΑζής 2 жыл бұрын

Simply NO! Your meter can blow up! (Measuring resistance on a live circuit is prohibited)... And internal resistance cannot be measured in this way...It looks like the ESR of capacitors...

@joseatevaldo53 2 жыл бұрын

Eu kero conpra um ledio desdi

@joseatevaldo53 2 жыл бұрын

Essi ledi em contra nu mercadolivre

@peterc.7807 2 жыл бұрын

newbie here, great vid, not familiar with all of this but i have 12V 7ah batteries I'd like to test however I only found those little wired resistors 1K and 5.5K (used on home alarm systems), can I use these to test the batteries - I quickly tried it but the Voltage did NOT drop at all with these resistors

@CamelCasee 2 жыл бұрын

Needs to be lower resistance, ideally a few hundred milliamps to an amp for batteries of this size to get any useful resolution. Try a 22 ohm 10 watt resistor or maybe a 12 ohm 15 watt, cheap ones from ebay are fine. What do you intend on using the battery for? A worn out battery may still be perfectly fine in low power applications or bench use but unsuitable for others.

@cemeteryguestrob9745 2 жыл бұрын

please will you make me a power pack like this?

@Chris-xo2rq 2 жыл бұрын

You could also measure the current with the resistor in place. (R1 + R2) = V/I. You measure I, you measure V, R1 is the resistor value, and R2 is the unknown internal resistance. Solve for R2.

@ed250256 7 ай бұрын

Yes, probably more accurate? but you need to do two measurements at the same time.... so need two meters.

@finecutpost 2 жыл бұрын

Very good effort for your first KZbin video. Never be scared to shorten parts that are running a bit long. I'm advising as a film editor Cheers David

@ahmedabdulkreem765 2 жыл бұрын

❤️🌹❤️

@ahmedabdulkreem765 2 жыл бұрын

👍

@roadsidediagnostics1017 2 жыл бұрын

Great video and simple equations I guess this is best for a constantly measuring of a batteries life or as you have done a number of the same batteries I tried it with a 10w 63ohm resistor on some car batteries, they where all new and measure milli-ohms

@orfeous 3 жыл бұрын

Is this possible to do with a car battery as well? What power resistor to use then? And where did that 120ohm number come from?

@CamelCasee 2 жыл бұрын

For car batteries you'd need a much lower resistance probably less than 8 ohms and rated for tens of watts (resistor will get very hot if left connected for long). But cars are outside and experience wider temperature swings than indoors, cold in particular will reduce the cold cranking amps so a cold night may be required to get a better picture (let the battery sit out there all night in the freezing cold first).

@cactusland88 3 жыл бұрын

Very nice clean installation. I really liked the battery back-up system.

@Mikhabiniorozco677 3 жыл бұрын

Wow great..

@L6FT 3 жыл бұрын

Very educational and informative, thanks.

@ed-jf3xh 3 жыл бұрын

You do know that the manufacturer's specified internal resistance is 0.17 Ohms? Quite the difference from 2.91 Ohms. A dead short on a fully charged battery should yield a 73AH drain.

@clems6989 Жыл бұрын

Should if been in milliohms..

@srnunan4783 3 жыл бұрын

If the internal resistance was actually 3 Ohms all the time then it would be pulling 4A internally and be flat within 30 minutes when on the bench. The internal resistance is more likely to be <100mOhms. You did identify the dud batteries doing a 100mA load test and your two red dot batteries pulled down to 5v and 11.2v so that shows that open circuit voltage tells you nothing and a load test of some kind gives a better indication of State of health.

@CamelCasee 2 жыл бұрын

Internal resistance appears in series with the cells, not parallel.

@richiebeard994 3 жыл бұрын

Fantastic job brother. You even took the time to show the huge difference in brightness. You've convinced me to at least upgrade to a 180 Lumen for now until I can afford the 2000 Lumen upgrade!

@CorzIlla 3 жыл бұрын

link?

@torukojinnn6331 3 жыл бұрын

dude this is the best multimeter measuring internal resistance video ever! thanks so much with every tiny details great master respect from Turkey

@rt.honourablegentleman4689 3 жыл бұрын

A BIG thank you for this video! It was exactly what I searched for and your video fitted ALL the slots. Thanks for the Vaseline tip also! Perfect.

@smythie08 3 жыл бұрын

Nice vid but very sloppy with terminology and fine detail. This could be extremely confusing to "new to electronics" people and sight impaired people, otherwise well presented.

@davea4882 4 жыл бұрын

He did the math super fast in the vid. It was 0.1 amps then multiplied by 12v to get the wattage of 1.2. He uses that formula shown in the vid to get his readings. From what I've seen mostly used, Ohms(R) =(v1-v2) / (v1/ohms used for test) using the same drain method to get V2. The results should be in the milliohms for what I have read. The result should match closely to the battery specs, when new of course.

@hangnhat-my-uc-phamhuan4228 4 жыл бұрын

Grab bag 3 Vissit my home

@milesmoore5422 4 жыл бұрын

1.2 amps = 1.2 watts ?

@davea4882 4 жыл бұрын

@nitinkumar29 4 жыл бұрын

12V/7.2AH lead acid battery with 12.9V open circuit voltage that I suspect to be gone bad, when connected to a 10W 1R resistor showed 4.3V till I can see on multi meter, the connecting wire to resistor and resistor were very hot, I had to remove the wire. So it was passing 8.9A. It shouldn't be right. Too much of current passing through it.

@ΠάριςΑζής 4 жыл бұрын

A 1Ohm resistor connected across a 12V battery draws 12A from the battery, or consumes 144W of power. In order for it to withstand such power, it should be made of at least three times that power, that is, nearly a 450W one, instead of the 10W you used. The feeding cables should have been accordingly calculated for proper diameter or (better) cross section, securing low voltage drop for that current magnitude instead of their inadequacy causing overheating. Apart of all these above, there is nothing wrong with your test. In fact, using high current, makes it much more reliable as regards the health of the battery under test... The point is to do it correctly and safely...

@CamelCasee 2 жыл бұрын

@@ΠάριςΑζής Wrong, the terminal voltage dropped from 12.9v to 4.3v the moment he connected the load. The high internal series resistance of the battery meant the actual combined load resistance was higher than 1 ohm. Also you don't need such a high wattage resistor for tests like this, three times higher is for product design where the resistor will be dissipating such power reliably for long periods of time, the 10w resistor getting overwatted for a few seconds during tests isn't the end of the world as long as it's resistance doesn't change too much, if in doubt put it in distilled water for cooling. Although I'd probably have used a 10 ohm 15w instead.

@ΠάριςΑζής 2 жыл бұрын

@@CamelCasee Where exactly am I wrong? My comment is based on the hypothesis that the battery under test is healthy and the calculations are accordingly done. Apart from that, it is obvious that the result is due to high internal resistance. What do you think that would happen during testing a healthy battery under the conditions you suggest? Have you ever seen the load resistors used inside the test instruments of the market which use the same method of dynamic testing of batteries? Do you know their wattage? They also are used for a few seconds per test as you say...but take a look at one of them before putting such comments...

@Mag1cat Жыл бұрын

@@ΠάριςΑζής He used a 120 ohm resistor.

@MuhammadOkaLegiono 4 жыл бұрын

good job ... interested ...come back to my channel like

@Alfa011 4 жыл бұрын

Great informative video! Thanks. There is a lot of potential for these handheld radios and there is a Facebook group to promote their use. facebook.com/groups/626284211601283/ 73 2AT111

@marioianniello7127 4 жыл бұрын

Cheers for the video content! Excuse me for the intrusion, I would love your opinion. Have you researched - Rozardner Powerful Battery Reality (Sure I saw it on Google)? It is a smashing one off product for learning how to recondition an old battery without the normal expense. Ive heard some super things about it and my cousin after many years got amazing results with it.

@Rudy80417 4 жыл бұрын

Linear amplificator?

@glauciogv5225 4 жыл бұрын

Good video, interesting information.

@MrNigel1340 4 жыл бұрын

Thank you, a very informative and well laid out video, regards Doc Cox.

@overbuiltautomotive1299 4 жыл бұрын

use over charge to de-sulfate them use current limiting resistor or light bulb 12 volt on one leg of input voltage from charger then 5 times run to 11 volts recharging as normal every time ,,its a way work best on flooded as one just add water but if they do not dry out being sealed one can crack sulfation away and reform themn

@overbuiltautomotive1299 4 жыл бұрын

@Dodai Dibri just charge battery then run it dead but only to 10.5 --10 volts recharge it should get better capacity on say 5th time then charge it 24 hour to 2 weeks yep a bout it

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