Nowadays , many phone support fast charging , so they are equipped charger and cables for fast charging , and we often buy some spare data cables , we not only condition whether these cables support fast charging but also the length of them , then the length of the phone data cable will affect the speed of the phone charging?
In theory , the shorter the cable , the smaller the resistance and the lower the power loss . oppositely , the longer the cable , the greater the power loss , so if follow this theory ,the charging speed of longer cable must be slower , but when you actually test it , you will find whatever the different length cables of same quality , the charging speed is almost same . what on earth factors affect the charging speed ?
Capacity of the battery
Apparently , larger battery capacity needs more time .
Charger
The charger determines the charging power ,the charging power is higher, the charging speed is faster, the charging power is generally marked on the plug .
Voltage drop of the data cable
Data cable connects cell phone and charger , because of the voltage drop although the current doesn`t decrease the voltage will drop , so there will be voltage difference between the two point of the data cable , if the resistance is over large the charging power will be lost on the cable , and affect the charging speed to a certain extent . the thinner the copper core in the cable , the larger the resistance which will more greater if it is not pure copper core .
Charging mode
Some phone could identify the charger and cable itself , if not standard charging equipment , may be have current limited , in addition , if choose data transfer mode when connect the phone cable to computer , although charging but the current will be much slowly because of the current limited . so if not need data transfer please choose charging mode when connect your phone to computer . and the over voltage fast charging phone will lower the charging speed as the heated after charging a period time .
Charging mode
Some mobile phones will identify the charger or charging cable by themselves. If it is not a standard charging device, there may be a problem of current limiting. In addition, many mobile phones are connected to the computer through charge cable for charging, if you choose to transfer data mode, although It will also charge, but the current will be limited and the charging will be slow. Therefore, if the mobile phone connected to the computer does not need to transmit data, please select the charging mode. In addition, the high-voltage fast-charging mobile phone will reduce the charging speed after charging for a period of time because of the heat of the fuselage.
In short, the length of the data line will affect the charging speed. This is certain, but if the quality of the data line is standard , the impact will be very little.