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"C" specifically refers to the discharge capacity, that is the shortest time the battery can be safely completely discharged in quantified in fractions of one hour. Time is measured on a sexagecimal system, in units of 60, so it can be evenly divided 1, 2, 3, 4, 5, or 6 ways evenly. So a 20C battery can be discharged in 3 minutes, where a 30C battery can be discharged in 2 minutes, 60C in a minute flat. That way you can multiply to get the total amperage, a 5Ah, 20C cell can discharge in 3 minutes @ 100A, where a 5Ah 30C can discharge @ 150A in 2 minutes.

This is what I love about youtube.. It teaches me more then all of my years in school.. :D

Great tutorial!

When a 6 minute video from 5 years ago explains batteries better than my school did this entire year

The way you explain this tedious topic is simply crystal clear and straight forward . Thank you I finally learned it right!

I've been waiting for a long time to hear these terms and processes explained to me. Thanks!

took KZfaq forever but it finally recommended me something useful, this is probably the best explaination of Ah, A, Wh and C I've ever come across. Definitely looking at batteries in a much more reasonable way now.

Great vid, as always. Thanks for the mention!

This could be the best explanation/tutorial I've seen in ages. Another thing, that AA with 2Ah capacity could've been very expensive back in 2014. I barely see rechargeable AAs these days as 18650 is by far, has become the standard size for battery-powered tools.

I was looking at power packs and powerstation, and seeing they had nearly identical or only marginally different mah ratings (which is what I thought was their capacity) even though they were immensely different sizes and hundreds of dollars different in price, I was very confused and this video has been extremely helpful

its been more than a week trying to understand these three topics. well you just explained everything in 0.1 h

The best video about batteries and their units i've seen so far. Congratulations!

Thank you very much!! A tutorial well explained like no other. Now I know what others couldn’t explain .

Great video! I always wondered if a machine would only take a number of amps it needed, or if you had too many amps if it would fail. now I know thanks to you!

Took electronics in high school now years later been playing with solar and a multimeter. Great content for a refresher!

Wow! This video is very well done and clarified a lot. Thank you!!

Thank you so much for explaining it so nicely. You’ve answered quite a few things I’ve had on my mind.

A Masterpiece as always....! Ah has been a mystery for me for years untill now..

I used to watch you videos back then, man I learn a lot here

You've cleared my confusions...thanks.

this is great. nobody talks about how ampere and amp hours are different, and i was confused for long time until got it by myself.

Great video! Thanks for clarifying that the units do not actually work out when dealing with C ratings.

I was literally just researching this. Thank you so much!

I don't usually comment on these types of videos but this was sooo helpful thank you. We were given an assignment with this in it but it wasn't covered in any lectures.

thank you , I've got a circuits midterm in 6 hours and this helped!

well taught. appreciate the illustrations. will make me into a smarter and more capable shopper for sure.

I'm so glad to see your videos popping back up on my feed again. You're always clear, concise, and fun with your explanations. Keep up the stellar work!

Totally not an electrical engineer or electrician but stumbled across this and it was very clear! thanks man

Excellent tutorial. Same as battery advertised in Wh / V = Ah

I didn't even listen to it. I read your captions and everything made sense. Nice!

awesome video. Good job! I enjoyed every detail explained at an engineer level.

Very well produced video and accurate information. Bravo!

Excellent video. Difficult topic explained in clear and in understandable terms.

Great video!! Amp hours had me buggin'..lol. The last type battery you showed, we use those type in drone racing/freestyle and they're used in many RC hobbies. With high performance drones, the c rating is very important to us, the higher the better performance, unfortunately the cost goes up too. With an average race/freestyle drone you can hit speeds up to 70mph+ but there is also a lot of sharp turns, flips and all around changes of directions in seconds, which means the throttle stick is constantly moving. Each of the 4 motors can pull appx 15-20amps, and the speed controller chips that operate them are rated at about 40amps for buffer from bursts. So imagine the energy draw on the battery, from 0 to max and back down again, 30 times or so during a flight. What happens to us when battery starts to get low, at the end of a flight, we notice what we call voltage sag, looking at it on a flight data chart, you'll see throttle input increase, and as the quad starts to gain momentum, the battery can't handle it, and the voltage sags, just for a second or so, but in racing that's an eternity..lol. So the higher c rating of a battery, you get lower resistance and way less voltage sag near the tail end of your flight, sometimes when you need it most trying to race to the finish line.

Short, clear and informative. That was very good.

Well done tutorial on battery basics. Many are clueless.

Thanks for making this very clear for dummies like me to learn!

GREAT!.. NOW I UNDERSTAND CLEARLY ABOUT BATTERY CAPACITY IN HRS, WHRS AND C RATINGS THANKS BRO

Best explanation I ever had, really good please keep up good work for us "slow learners"

great explanation now I understand how this works and what's the difference in between

Brilliant video as usual, my brain loved it. So did I.

what a nice explanation. . this is what i was looking for..

I Learned so much from you, thanks for that! Things i Never thought i could grasp, now become clear to my aging Brain. Greetings from Germany !

Great explanation to calculate battery life and understand C ratings!

Your videos are awesome. Could you please make a video explaining what it means for a electrical component to draw too much current?

great demonstration. i think im startin to get it now..

Simple and clear explanation. Thanks!

I like to think of the C rating as implicitly in units of per-hour (1/hour or hour^-1), so that a 2C rating means you could (in theory) discharge such a battery twice in one hour (or once in half an hour). This way, you have a calculation such as 2.2 Ah x 20/hour, and the hours obviously cancel out, leaving a measure of current.

thanks about the explanation, Finally I know about C rate and relation to Amper Hours. The video have helped me understand my problem

Magnificent and easy to understand. Thank you.

Thanks, your videos are so informative! Keep it up!

Thank you! you answered a lot of my questions

Thanks for this great video, it has helped me to disperse some of my questions.

Great explanation! A lot of people today are so confused with (Ah) and (A). These are the things the people need to know when buying power banks, vape batteries etc.

Good voice, clearly speech and very good videos.

Thanks for the valuable information you provided. Can you explain what does​ the "initial current less than 60A" written on the side of a Gel 200Ah battery mean?

u really rocked it bro.....it is very easy to understand by way u teach...

Just learned more in 6 minutes than in 3 years of high school Electronics class. Subbed.

That certainly cleared up a few things, I've been curious as to what the amp hours thingy on batteries actually meant. Had to watch some of this a few times before I got it.

Thats very informative.Thankyou for posting in a very "understandable" way.

Very clarifying video, thank you very much!

I will have to watch it a couple more times. My head is spinning. Good instruction. If I were smarter I could say you made it easier to understand

Thanks for the excellent tutorial it really saves time

I'm so glad you're making videos again. I have a question. Why do rechargeable batteries have mAh ratings on them but non-rechargeable ones do not? Aren't regular chemical batteries also able to deliver a set amount of current in amp hours?

Amazing explanation! Thanks for sharing! :) Now everything is clear.

Thanks for the video. Immediately clarify the areas I could not understand.

Amazing video, exactly what I was looking for.

I'm currently testing my surprisingly large collection of AA and AAA batteries with a RS232 logging multimeter and 3.2 ohm load. This makes about 200 ma current draw. I'm logging the data to a computer and working out the total amp-hour capacity of the batteries to estimate their overall maximum charge. Seems to be working pretty good. I'm measuring mA not volts. (If i had arduino or two DMM i'd do both at the same time). Thanks for the vid.

Great tutorial as always.

this is a great video. thank you. I have a question. I have a cordless vacuum, its rechargeable battery pack needs to be replaced, however, it has been discontinued. It is 4.8v 1.3Ah. I wonder I can simply get 4 AA rechargeable batteries bundled up to replace this old one? thank you very much

This is great. Thank you.

Hello, thanks for this awesome learning material. This is really helpful for query regarding Amph

We need more videos on batteries like this!

Perfect! Clear and to the point.

Can you do a video about how you acquired your knowledge (education, career, etc)? I'm taking electrician classes right now so I'm curious. Also, your videos are awesome.

Thanks for the video! So great 😍👏 I was looking for this information.

This taught me more that my school ever can. Im defnitely wathing your vids and subbing. Dont know if you already make videos on normal electronics and electric topics in physics for school, if not you should cause you'd make a great teacher :P

No.. Thank you for Making & uploading this video and many others 👍👍

Very, very good post thank you. The internal impedance has really changed my thoughts on a battery bank. A subtle but important note, thank you!

thank you for this fantastic video!

Outstanding. Thank you very much!

Excellent as always.

4:35 - yes that's right! coz in the context of physics, power = work done / time. so obviously work must be in the unit Joule thus Power has to do with energy.

nicely done the explanation.

Very useful information. Thank You.

Great video and it was really helpful. Thanks

Amazing explanation thank you

Well explained! Thanks!

Excellent video - thank you

If I'm using a Li-ion battery with a limit of 4 A, feeding a circuit with a duty cycle of 80% consuming an average of 3.5 A, is the battery going to behave as if it's consuming 4.4 A and therefore opening the circuit? Would a buck converter fix this? If I manage to increase the frequency of the PWM, can I trick the current monitor by having an on-time smaller than its over-current detection delay time? Thanks for all your videos, you're amazing!

Thank you very helpful, by the way are you the voice of 'Talky the toaster' from Red Dwarf TV show?

Great video. I'd like to have seen a little more mention of the hazard of over discharging some batteries. Venting a Li-Po is bad lol.

Very nice explenation. Thanks for Your videos.

Wow, very informative video, thanks a ton!

wait, so if i have 2 identical battries with same eletrodes/ chemistry/chemicals nominal voltage etc but one of the battries has more capacity the higher capacity battery would have a lower c rating?

Very educational video. Thank you.

I Think that was a beautiful and useful video, thanks a lot for your effort :D

A great tutorial for a beginner. I like the way of explain and I'm gonna like and also subscribe to your channel.

Thanks for the information!