Get up early in the morning and start a new day's work. You unplug the fully charged Android phone from the charger and gently press the button to sync the email. When you lazy to take a shower and check the emails you receive, you suddenly notice that the phone's power has instantly returned to 90% - right? 10 minutes of power consumption in less than 10 minutes, this battery is too weak, right? !

Yes, today's smartphone users generally complain that the battery is too weak compared to the previous phone, and the fact is true – if you accidentally put the S40 phone at home a few years ago, come back to your phone in a week. Still running tenaciously. Looking at the latest smartphones, it's hard to see instances with standby times longer than two days.

Why is there such a big gap? Because early mobile phones usually only make calls, today's mobile phones have many functions such as sending and receiving mail, browsing the web, GPS navigation, browsing pictures, and enjoying videos. The early mobile phone screen was only 128x128 black and white small screen, now the mobile phone. But it can be equipped with a 4.3-inch large color screen - the ultimate cost of all these changes is the geometrically rising power consumption.

Interestingly, the battery charging technology has also increased the user's misunderstanding of the battery: early mobile phones have obvious defects in the design of charging protection - when the battery is saturated, it will only reduce the input power and always keep the battery In the maximum state of charge. In the short term, this approach does allow the battery to reach its maximum value, but staying in this state for a long time can cause damage to the battery. Authority battery Battery University website this explanation: "keep the battery charge state at the maximum time to be as short as possible, otherwise the output voltage of the power supply battery accelerate corrosion, this effect especially at higher temperatures obvious".

The reason why many mobile phones will drop 10% in a short time after unplugging the charger, because the current battery will be charged once the charge reaches 100%. The function will immediately cut off the charge from the charger. The amount of power and the battery's power is automatically consumed slowly, until the battery drops to about 90%, it will continue to open the charging process again. In most cases, the battery power may be exactly 90% at the moment you unplug the charger, so it seems to be a good idea to quickly power down 10%. Because of this, the meaning of charging the phone all night is not that big - it just makes your battery continue to experience the cycle of charging and discharging.

Why are mobile phone manufacturers so designed? Because there are only three options available to them:

Option 1: Using the old charging technology, always keep the battery power at the highest value of 100% (as was the case with early battery charging solutions). However, as mentioned earlier, this immature charging method will damage the battery and reduce battery life, so it has now been eliminated.
Option 2: Use the new charging technology and use the accurate power statistics function (just like the power statistics program of the blue data line just now).
Option 3: Use new charging technology and use inaccurate power statistics (ie, the current Android system's own power statistics program).

Focus on the second and third options, which will make a large number of users feel uneasy - because no consumer is willing to see the phone plugged in the charger no matter how much, but the total display is about 90% That is, the total charge is not full. They will doubt the charger or the battery itself in the first place. In comparison, the phenomenon of quick power-down after unplugging the charger caused by the third solution will be noticed by the consumers, but in fact, consumers who actually complain that the battery or the charger itself has problems will be much less. The right is taken lightly, which is why the third option is adopted instead of the second option.

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