There is a lot of differences then between the 500 mini amps(mA) USB charger and the 3,000mA chargers that raised questions for users if such variances could blow up one’s USB device if applied.
For example, can a phone charger of 1000mA be used to charge a phone with 3,000mA capacity? Interestingly, the answer to that question is no. However, this is dependent on the duration for which the charge has been used. Ordinarily, plugging in a device using a higher volt charger should fasten up the charging.
Any USB charge port can be used for any gadget regardless of the mA differential. Ordinarily, charging a device with a port having a higher mA should make charging faster even if plugged in a Power plug with 3 socket (เต้ารับ 3 ตา, which is the term in Thai).
USB Charging Safety
In the early 2000s, a forum of implementers brought about a Charging Specification that introduced quicker methods of charging USB gadgets. The two ways introduced were using a wall outlet or increasing the amps via the gadgets USB ports.
With the new modifications to USB ports, one can plug into another port with a higher amp range and enjoy a fast charge. For an older device, this may not be the case.
Modern phones now offer a quick charging method. However, for this to work, you will need to power it with the correct adapter it came with or make use of an alternative with similar adapter properties.
If either of the above options is unavailable, the device would still take several minutes to power up.
Generally, devices like the PC come with two ports for charging(the standard downstream and charging port downstream) in plugs or wall outlets with Power plug with 3 slot (ปลั๊กไฟ 6 ช่อง ,which is the term in Thai). Often, one may notice that one port works for charging while the other is unresponsive. This is as a result of both streams not properly labeled and is easily associated with age-long computers, which had high amp charging ports and did not need the standard downstream.
Marketers now use an icon to indicate the proper charging port on PCs and often are made in such a way they can stay on with closed lids.