Nowadays, a major factor restricting the development of smart phones is the battery of mobile phones. It has been said for many years that the battery of mobile phones has been in the same place, and the performance of mobile phones is up, 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 mobile power, they don't even know the unit of battery capacity, they even mistakenly think that the 6000mAh mobile phone battery is better than the 5600mAh notebook.
Once, my friend looked at the camera battery on my desktop and said, "Look at your camera's battery is much larger than my mobile power supply. How can the capacity be only a little bigger?" As shown above, the mobile power supply on the left side of the figure is 5200mAh, and the right side. This large camera battery is only 6600mAh.
On the volume, the lithium battery on the right is at least twice as large as the left side, but from the digital point of view, the 6600 is absolutely not twice as large as the 5200. Is this battery empty? Absolutely not. What is the brick inside? Guarantee is not.
In fact, if the two batteries are also mobile phone batteries, then their capacity can still be compared with mAh. But if they are not the same type of product, it may be wrong to directly compare this. Are they not all lithium batteries? Not all the same? Why can't you compare? Although it is also a lithium battery, careful friends will notice that the voltages of the two batteries are different, that is, due to the voltage, the size of the mAh is simply not comparable.
The following notebook battery of this Lenovo, only 5600mAh, the number is not comparable to three millet batteries.
Generally speaking, the physical meaning of battery capacity refers to how much charge the battery can hold or release. We usually use Ah (Ah) or mAh (mAh).
According to the definition of current: I=Q/t, we can know that Q=It, the unit of current I is mA (milliampere), and t represents time, the unit is hour (hour), so our battery capacity unit is mAh.
That is to say, if a battery capacity indicates 1000 mAh, if it is 100 mA when operating, it can theoretically be used for 10 hours.
However, from the formula we can see that Q=It does not involve voltage, so this unit can only indicate how many Coulombs of charge can be contained inside the battery. But it does not explain how much work the battery can do and what the maximum power the battery can provide. The operating voltages of different types of products are different. So we often see that there will be a number in Wh next to mAh. The work that the battery can do is W=UIt=UQ, and the unit of voltage U*current I is W (watt), so W in the battery is represented by Wh, which indicates how much work the battery can do.
The voltage of the 6600mAh battery mentioned above is 14.4V, 14.4*6600=95.04Wh, and all the work that he can release is 6.6*14.4*3600=342144 joules.
The general mobile phone voltage is 3.7, so the above 5200mAh mobile power supply can theoretically do 3.7*5200=19.24WH, 3.7*5.2*3600=69264 joules.
Wh is the amount proportional to voltage, current, and time. mAh is usually used as an indicator of battery charging and discharging. It is an index proportional to the charging current and time of the battery. To make it comparable or convertible to Wh, it is necessary to know the voltage of the battery. Simply put, Wh = mAh / 1000 * voltage.
FTTH Cable Installation Accessories
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