🔋 Battery amp-hour, watt-hour and C rating tutorial

🔋 Battery amp-hour, watt-hour and C rating tutorial

A guide to battery capacity measurement including amp-hours, watt-hours, C ratings and more.
Website: http://www.afrotechmods.com/
The Amp Hour podcast: http://www.theamphour.com/

50 Comments

  1. Vaishali Gadgil on August 30, 2021 at 10:27 pm

    We need more videos like this

  2. Simon's Stuff on August 30, 2021 at 10:31 pm

    A bit too short,agree?

  3. Metal Monkey on August 30, 2021 at 10:34 pm

    Why is C rating confusing? It is a rating to tell you how much power a battery can supply in a single instance. You wouldn’t put a low C battery in a quad-copter that draws high amps for its motors, for example, and you wouldn’t pay for a high C overkill battery just to run something like a powered microphone that is only going to draw a handful of mA at any given time.
    It’s still measured in amps, because you can draw more amps from battery B, in your example, and therefore run more things from it, or higher demand things from it, at any given time without risking damage (for less time before needing a charge as they have the same AH capacity).
    It SHOULD be measured in amps! How else would YOU measure it?

  4. Merin Mary Josy on August 30, 2021 at 10:35 pm

    well explained

  5. Mashhor Alshrieef on August 30, 2021 at 10:37 pm

    Hey there,

    I am trying to make a solar energy system. I’m trying to build it based on a 48v battery and 2 pvs each 170w (Voc 34.6 v) connected in series.
    1 ) what my pv system should be 12 v or 24 ?
    2) charger controls should be 12v or 24v and how am I going to manage that knowing the battery is 48v?
    3) my inverter is 2.5 kw. should i pick 12v or 24v ?
    4) Does the current of the charge controller need to match the current of the battery ? and if one higher or less than the other would make any difference? if my CC max output is 30 amp and the battery current is 40ah would that still work? does the current of the battery have to mach the current of the inverter?

    Thank you very much for your help and looking for forward hearing from you

  6. Afrotechmods on August 30, 2021 at 10:38 pm

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  7. john hopkins on August 30, 2021 at 10:42 pm

    Interesting add on might be: "How to measure the internal resistance of a battery"

  8. Kannan Majeev on August 30, 2021 at 10:43 pm

    the c rated mentioned in a pack is for one cell or for the whole pack?

  9. E C on August 30, 2021 at 10:44 pm

    Sp the higher the C rating the better right?

  10. Sagar Puri on August 30, 2021 at 10:44 pm

    Can you please tell what does mmAh in smartphone battery means.

  11. Alex Z on August 30, 2021 at 10:46 pm

    Theoretically I can carry a 3KWH battery on an airplane because a 30V 100WH battery has 3KWH in it. Of course this is not true since 3.8V is the unspoken voltage for most consumer electronic devices.

  12. Avinash Maurya on August 30, 2021 at 10:50 pm

    Is there any formulae for maximum current can a battery handle?
    Suppose 9V battery for e.g Hi Watt 9 V battery.

  13. Hawaii Dogs on August 30, 2021 at 10:51 pm

    Ty sir

  14. Johnny Greeko on August 30, 2021 at 10:52 pm

    Can you explain, if you have a battery with no information written on the battery itself, how do you find the rating on it? I have batteries that are just silver with no info on them. Thanks.

  15. hair✓ ꤶ✅☑️✔✔️ on August 30, 2021 at 10:54 pm

    Mah

  16. rahul ambade on August 30, 2021 at 10:55 pm

    Can you please share base of C rating calculation. Hence, I am confused.

  17. Official Basem AlOtaibi on August 30, 2021 at 10:55 pm

    I have a power bank with 90k mah. How long will it last if I use it to turn on a screen with 5A and 250v? Please I need answer

  18. llelen on August 30, 2021 at 10:56 pm

    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.

  19. NoClassRoll on August 30, 2021 at 10:56 pm

    Thanks

  20. ram udu on August 30, 2021 at 10:57 pm

    I have lipo with 11.1v 2200mah 30c battery used for my quad I want to make a li ion pack Iam confused which li ion cells should I use and in which configuration

    Hi bro I have a quad with spec
    920kv motor with 1045 propeller 30a Simonk esc
    Apm2.8
    Djif450 frame
    M8n GPS and fsi6 to and rx

    Currently I’m using 11.1v 2200mah battery Ian getting a flight time of 3 min when I hang my mobile phone to record video without gimbal

    Can u plz suggest which li ion cells should I use and in which configuration Pls help me out

  21. james dean on August 30, 2021 at 10:57 pm

    What determines the discharge rate of a battery? I understand the capacity is a factor, but what else? You showed those 2 rc batteries which looked the same and were sized the same. 20c and 40c. What exactly makes one 40C?

  22. Sujan Pal on August 30, 2021 at 10:58 pm

    Good

  23. Orli Saez on August 30, 2021 at 10:58 pm

    Short, clear and informative. That was very good.

  24. Bou Run on August 30, 2021 at 10:58 pm

    thanks brother

  25. RASWANTH KRISHNA on August 30, 2021 at 11:00 pm

    Noice 👍🏾

  26. Etchi Sinoga on August 30, 2021 at 11:01 pm

    Hello Dear Sir: I have a 12v 200AH GEL solar battery, what are the characteristics of a battery charger capable of charging my accumulator without damaging it? I would like to have explanations from you with detailed calculations to make my choices independently when faced with any type of battery.
    I want your advice before choosing a suitable charger.
    Please answer me.

  27. My True Love is My FR-S on August 30, 2021 at 11:02 pm

    WHY TF Don’t companies advertise wh instead of mah? I never understood that crap and it causes so much confusion

  28. Sister Carla on August 30, 2021 at 11:02 pm

    So if I want to buy a solar panel what should I take as mAh ?

  29. nothing on August 30, 2021 at 11:04 pm

    Not me trying to understand batteries LOL

  30. Nandanie Munindradasa on August 30, 2021 at 11:04 pm

    Hello. If you take out 40 A for 1 hour from a 12 v 40 Ah car battery what would be the terminal voltage at the end of 1 hour.

  31. A Christian on August 30, 2021 at 11:05 pm

    1:24 well not quite. Ah is not linear. A 70 Ah battery will not give you 70A for an hour or 1A for 70 hours. The Ah is based on a C rate. People can look up Peukert’s Law.

  32. K S LAM on August 30, 2021 at 11:07 pm

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

  33. Etchi Sinoga on August 30, 2021 at 11:09 pm

    Hello Dear Sir: I have a 12v 200AH GEL solar battery, what are the characteristics of a battery charger capable of charging my accumulator without damaging it? I would like to have explanations from you with detailed calculations to make my choices independently when faced with any type of battery.
    I want your advice before choosing a suitable charger.
    Please answer me.

  34. Francis John Contreras on August 30, 2021 at 11:09 pm

    Great video! I need help on NiMh batteries. I am into the hobby of Tamiya Mini 4wd and batteries make a great deal on our races. I normally use 2x Fujitsu AA NiMh batteries (min. 1.2v 1900mAh) on our cars. What we need to achieve is a high consistent current delivery and as well as the batteries needs to last longer. Batteries shouldn’t self discharge so quickly as well. We normally charge the battery on smart chargers (we don’t normally charge the batteries individually, it’s a series of 4-6 cells per 100watts channel charger) for .2A – .3A. We also cycle them with a discharge rating of .5A and a voltage cut-off of .9V (multiplied how many cells we are charging per tray) and same charge rating. My question is how do we ‘break-in’ a new battery and how do we charge and cycle them?

  35. Daniel Garcia on August 30, 2021 at 11:09 pm

    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

  36. Sυиѕнуи· ·Яƒƒ on August 30, 2021 at 11:10 pm

    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.

  37. TheDeterminer on August 30, 2021 at 11:10 pm

    So the Capacity of a Battery (Ah) is directly proportional to how many electrons it can hold at once?

  38. NIL on August 30, 2021 at 11:10 pm

    Thank again lol

  39. Gazi Salah Uddin on August 30, 2021 at 11:11 pm

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

  40. Arun Kamal on August 30, 2021 at 11:11 pm

    Well explained 👍

  41. Newfie Led Man on August 30, 2021 at 11:11 pm

    thanks Great Video.
    keep them coming

  42. Ravi Paswan on August 30, 2021 at 11:11 pm

    Very well explained 👍🏻😊

  43. ASIF ARMAN on August 30, 2021 at 11:14 pm

    In case of lead acid battery can discharge 120amp in 30 seconds.

  44. Jef Du Bin on August 30, 2021 at 11:15 pm

    wait wat??

  45. Brian Willess on August 30, 2021 at 11:19 pm

    Mess up
    https://www.merriam-webster.com/dictionary/screw
    9a vulgar : an act of sexual intercourse

  46. BUILD ROBOT on August 30, 2021 at 11:19 pm

    I learn more things then college. Thank u guys

  47. Batteryand charger on August 30, 2021 at 11:20 pm

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  48. Bob Adkins on August 30, 2021 at 11:21 pm

    The standard should be watt-hours, not ampere-hours. It just makes more sense. Of course it would be at a reasonable percentage of voltage.

  49. rea hermoso on August 30, 2021 at 11:22 pm

    greetings thank you very much on your channel

  50. white Light on August 30, 2021 at 11:26 pm

    Sir
    1 Ampere=6.28×10^18

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