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There might be a question in our mind while charging a phone. “Can my normal charging phone be fast charged with a fast charger” so we buy a quick charge 2.0 or 3.0 rated charger but there is one question that comes once again in our mind. “Battery might get damage if I charge a normal charging phone with quick charger”. But is it true, Let’s see the answer below?
Technically:
A USB fast charger supports two output modes
- 5V (Default)
- 9V (on request)
- 12V (on request)
Any USB device connecting to the charger will receive 5V and can draw maximum 1.8A, so the output is within the USB standard specification.
To receive 9V, the device needs to talk to the charger and ask it to switch to 9V.
If the device cannot do this (=no fast charging support) it will keep receiving “normal” USB power.
You can use it also for other phones or devices, without any risk of damage.
The fast charging mode (higher power output) is only enabled if a phone is requesting it from the charger.
Without this request, the charger will behave like any other USB power supply.
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According to Android Central
Quick Charge 2.0 or 3.0 is a licensed technology from Qualcomm, there are lots of third-party companies making accessories that support the technology already. All you really need to look for if you’re searching for a supported third-party accessory is the Quick Charge 2.0 logo, the circle with a lightning bolt and typically “Quick Charge 2.0 or 3.0” in the great big font on the packaging. You may see just the circular logo on the accessory if you’ve already taken everything out of the box, but it’s usually pretty easy to identify these chargers without hunting for the voltage and amperage outputs.
More Technical
Qualcomm says that Quick Charge can charge about 75% faster than conventional chargers. Qualcomm is about 75% faster than regular chargers with a 5V 1A electrical output, which is already much more powerful than the plain 5V 0.5A USB.
Quick Charge 3.0 was launched in 2015 and is mostly a power-efficiency optimization that charges at the same speed as QC 2.0 but generates much less heat while doing so. It charges 2X faster than QC 1.0 and is 38% more “efficient” as QC 2.0.
Quick Charge 2.0 (QC2.0) chargers can support 5V, 9V or 12V (volts) and up to 3A (Ampere) and 60W (see the QC2.0 video demo).
Quick charge 1.0 could support 5V and 2A (10W). Many chargers on the market support 5V 1A, and standard computer USB ports output a minimum of 5V, 0.5A. There are many more variations that land somewhere in between.