We all have USB powered gadgets like the iPad, or a smartphone like iPhone etc which have the option of charging either through the wall chargers or the computer USB ports. But do you know that there is a lot of difference in charging and its speed when it comes to both of these charging methods? Not sure about you but I didn’t know this until the wall charger of my iPhone went faulty.
It was when my apple wall charger became faulty, that I started charging my phone with the computer USB port. Although I knew that USB charging takes more time than electric charging but what I didn’t know was that the battery started depleting twice faster than before. The day I got a new wall charger for it, I realized that it was not the battery but the mode of charging that was the reason behind.
Before going deep into this topic let us first discuss about USB port charging. There have been 3 types of USB ports till now, USB 1.0, USB 2.0 and USB 3.0 among which USB 2.0 is the most common port these days. If we talk about the current specifications that USB 2.0 have, it is as follows. USB 2.0 is capable of delivering charging up to 500mA (0.5A) whereas USB 3.0 can charge the devices with charging up to 900mA (0.9 A).
On the other hand, wall charging with the dedicated charger speeds up charging as the Ampere rating for it is higher than the computer port charging. Charging through wall charger can deliver current up to 2.1A (my iPhone charger charges at 5V and at 1A) which means faster charging.
Will it blow the battery if charged on a higher rating?
As per extremetech, you can plug any USB device into any USB cable and into any USB port, and nothing will blow up — and in fact, using a more powerful charger should speed up battery charging. This means nothing will blow up.
Well in case you still have doubts, you can read the actual post here.