What are the differences between battery mAh and Wh

What are the differences between mAh and Wh of batteries? One of the important factors restricting the development of smartphones is mobile phone batteries. Over the years, it can be said that the battery of the mobile phone has been in the same place, and the performance of the mobile phone has been improving, but the battery life is still not a good solution. Because of this, the mobile power market will be so hot. But for those who buy power banks, they don’t even know the unit of battery capacity. They even mistakenly think that 6000mAh mobile phone batteries are better than 5600mAh laptops. Once, my friend looked at the camera battery on my desk and said: Look, your camera battery is much larger than my portable power supply. In the picture above, the power bank on the left is 5200mAh, while the camera battery on the right is only 6600mAh. In terms of volume, the lithium battery on the right is at least twice that of the lithium battery on the left, but the 6600 is definitely not twice that of the 5200. Is this battery empty? Of course not. Is that a brick? No promise. In fact, if these two batteries are mobile phone batteries, then their capacity can still be compared with mAh. But if they are not the same type of products, direct comparison may be wrong. Are they all lithium batteries? Are they all the same? Why not? Although the lithium batteries are the same, careful friends will notice that the voltages of the two batteries are actually different. It is also because of the voltage. The simple magnitude of the number of milliamps is incomparable. The battery of this Lenovo notebook below is only 5600mAh, which is not as good as three millet batteries in number. The physical meaning of battery capacity refers to how much power the battery can hold or release. We often use Ah (ampere) or mAh (milliampere) to express. According to the meaning of current: Iu003dQ/t, we know that Qu003dIt, the current I is in mA (mA), t represents the time, the unit is hour (hour), so our battery capacity unit is mAh. In other words, if the capacity of a battery is 1000mAh, if the current when it is working is 100mA, it can theoretically supply power for 10 hours. However, we can see from the formula Qu003dIt that it does not involve voltage, so this unit only indicates how many Coulombs of charge can be contained in the battery. It is not clear how much work the battery can do, nor how much maximum power it can supply. Different types of products have different working voltages. So we often see a number in Wh's. The work that the battery can do is Wu003dUItu003dUQ, and the unit of voltage U*current I is W (watts), so W in the battery is represented by Wh, which indicates how much work the battery can do. The voltage of the above 6600 mA battery is 14.4v, 14.4×6600u003d95.04wh, and the work that can be done is 6.6×14.4×3600u003d342144j. The voltage of a general mobile phone is 3.7, so the above 5200mAh mobile power can theoretically do 3.7*5200u003d19.24wh, 3.7×5.2×3600u003d69264j. Wh is proportional to voltage, current and time. The milliampere-hour is generally used as a charging and discharging indicator of a battery. It is an indicator proportional to the charging (discharging) current and time of the battery. To make it comparable or convertible with Wh, the voltage of the battery must be known. Simply put, Whu003dmAh/1000×voltage. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: Talk about the common sense of digital camera battery maintenance