What are mAh, Ah, Wh?
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Hello everyone, welcome to the ZimZimDIY channel. For today, it's a short clip. I'll talk about a unit of measurement that measures battery capacity. For example, 18650 lithium batteries, we will see the manufacturer specify the capacity, such as 3,000 mAh. 3,000 mAh is 3Ah. What does the word "Hour" mean? In fact, it means that this battery can supply 3A of current to the load within 1 hour. After that, the battery will run out of power. But it doesn't supply a constant current of 3A to the load all the time. It depends on the resistance of the load that is connected. This means that if the load has a low resistance value, it will consume a high current from the battery. And vice versa, if the load has a high resistance value, it will consume a low current from the battery. For example, let's say I have a load that consumes half the current, consuming 1.5A, so the battery will last longer. The duration will increase to 2 hours and if the load draws a current of 0.75A, the battery will last for another 4 hours. You see, the battery will run out quickly or slowly depending on the load that draws current. We can roughly calculate the duration by taking the battery capacity / the amount of current drawn by the load, which will give you the hours of use. Now, if I have 2 batteries, one 3.2V 3Ah and the other 3.7V 3Ah, you will see that the current released is the same and the hours of use are the same. So how are they different? In fact, the difference is in the energy released. The one with higher voltage will provide more energy, but in fact, a single battery can supply more current than we think if the load is very low or has almost no resistance. Some batteries can discharge almost 10A. If we compare it to a human, think of some friends who are spenders and sustenance. When they get to spend, they will spend until they are broke, which is very dangerous. The battery will be damaged, it will heat up, and the wires or connected load can catch fire in a few seconds. Therefore, they have a C.rate value. The C.rate value refers to the ability to receive and / or discharge current safely in a short period of time. For example, this battery has a C.rate value = 1C, which means that if we take the C value x the battery capacity value, 1 x with a 3,000 mAh battery = this battery can charge or discharge at a maximum of 3A. But if the other battery has a C.rate value of 0.5, 3,000 mAh x 0.5 = this battery can charge or discharge at 1.5A. However, normally, we will not charge or use the full C.rate provided. This is the appropriate and safe method that I would like to recommend. For charging the battery, I use a current of about 1/3 of the C-rate value, which is enough to preserve the battery, especially for lithium-ion batteries. For this clip, I will present only this much. Thank you to all my friends who have followed and watched.
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