Intro
Slow charging? Fast charging? Super flash charging? Many people may not be particularly clear about the three concepts of slow charging, fast charging and super flash charging for mobile phones. Today, I will introduce to you how to distinguish these three charging methods in a simple and easy-to-understand way, and learn some basic knowledge about mobile phone charging.
For current mobile phones, the main difference between slow charging, fast charging and super flash charging lies in different charging agreements and charging cables. Different chargers have different charging powers to provide different charging speeds.
Slow charging [standard charging]
With the standard USB charging protocol, usually the output is 5v [volt] 1a [ampere] or 5v2a, 5w or 10w, charging speed is slow,
Typically, if a 5000 mAh battery is charged with a 5W charger, the required charging time is calculated as follows:
Generally, the battery voltage of a mobile phone is 3.7V or 4.2V. Taking 3.7V as an example, first we have to calculate the charging current:
I = P/U = 5W/3.7V≈1.35A =1350mA
According to charging time = power/current, we can get:
t = 5000mAh / 1350mA ≈ 3.7h
In fact, it usually takes 3 minutes for this 5W charger to charge a 5000mAh battery to 1%. Taking into account factors such as energy loss during the charging process, the actual charging time may be around 4-5 hours.
Fast charging
The charging power is between 18W and 27W, which is increased by increasing the voltage or current, or both. Common protocols include QC and PD, and common chargers are 9v2a, 9v3a, etc.
Calculate the time required to fully charge a 5000 mAh battery using 18W fast charging, also considering the mobile phone battery voltage to be 3.7V.
First, according to the formulaCalculate the charging current,
Then calculate the charging time according to charging time = power / current.
Generally speaking, with a charging speed of 18W, a 5000mAh battery can be charged to 1% in about one minute, and to 35% in 40 minutes. Considering practical factors such as loss during the charging process, it may take about 1.2-1.5 hours to fully charge.
Super Flash Charging [Super Fast Charging]
The charging speed is extremely fast, with a common charging power of 40-50w, and it can reach 120w charging power in a short time. However, mobile phone manufacturers generally claim max67w, max120w, and use higher voltage and current. This is basically a private protocol of mobile phone manufacturers. The chargers of various mobile phone manufacturers are not compatible with this super fast charging. Only by using the manufacturer’s own dedicated charger and charging cable to charge their own mobile phones can the super flash charging power be achieved.
This super fast charging is dynamic power charging, with a maximum of 67w or 120w. It is difficult to calculate. According to the manufacturer’s publicity, it takes 20-30 minutes to fully charge 80%.
The above three charging methods display different charging icons on the phone notification bar. The common methods are:
slow charge
A lightning symbol appears next to the battery icon in the notification bar.
Fast charging
Displays two lightning symbols.
Super fast charging
A large lightning symbol or a gold charging logo will be displayed, and the words “Max 67W” or “Super Fast Charge Turbo” will be displayed.
Some mobile phones will display different colored charging icons to distinguish the charging speed.
Fast charging vs Flash Charging: advantages and diadvantages
Fast charging
Increase voltage, decrease current
Advantages : Because of the low current, it has strong compatibility and does not have high requirements for mobile phone chargers and data cables.
(You can use a charger that supports flash charging technology, which will not cause substantial damage to the phone battery)
Disadvantages: Increasing the voltage will generate higher heat, causing the phone to heat up and affecting battery life
Flash Charging
Lower the voltage, increase the current
Advantages: When charging with flash charging, the heat will be transferred to the charging head, so it is safer.
Disadvantages: Due to the large current, a special charging head and data cable are required, so the cost is higher and the price is also higher.
Here are some suggestions! ☛☛☛Everyone should choose the appropriate charging method according to different needs and mobile phone brands!
Warm tips on mobile charging
◆Do not cover anything on your mobilephones during charging
When the phone is being charged,it is in high temperature. If you cover the phone with something while charging, it will affect the heat dissipation.
◆Don’t play your mobilephones while charging
Playing with your phone while charging will keep the charger in working condition, which may cause aging and even lead to accidents such as electric shock, fire, and explosion.
◆Connect the power supply first and then the mobile phone
The correct steps to charge a mobile phone are to first plug the charger into the socket, and then plug the data cable into the mobile phone.
◆Do not use computer USB to charge your phone for a long time
This will damage the mobile phone’s lithium battery and shorten the battery life.
