Fast charging on USB.

Thread Starter

stanlo45

Joined Mar 10, 2010
1
I noticed that my Samsung charger outputs 9v at 1.25A while charging my mobile.
Is this correct/OK?
Its the original charger that came with the phone. Samsung A21usbCharge.jpeg
 

MisterBill2

Joined Jan 23, 2018
12,690
Probably the charging connector is not a USB type connector.
Prior to most adopting the USB connection every brand wanted their charging connectors to be different and non-compatible with any others. So all at once 5 volts is it. Prior to that none were 5 volts.
 

Ya’akov

Joined Jan 27, 2019
6,260
Probably the charging connector is not a USB type connector.
Prior to most adopting the USB connection every brand wanted their charging connectors to be different and non-compatible with any others. So all at once 5 volts is it. Prior to that none were 5 volts.
No, it uses USB and negotiates the voltage. It's just another proprietary fast charge scheme that was finally obsoleted by USB C PD.

This is a Samsung Adaptive Charger:
1660459797590.png
 

Reloadron

Joined Jan 15, 2015
6,817
I noticed that my Samsung charger outputs 9v at 1.25A while charging my mobile.
Is this correct/OK?
Its the original charger that came with the phone. Samsung A21View attachment 273666
Yes it is, as Ya'akov Explains. The unit should have in five print EP-TA20 Input 100 - 240 VAC 50~60 Hz, Output 9 VDC 1.67 Amp or 5 VDC 2.0 amp. Your phone uses the newer USB C PD connector. The phone, as mentioned, negotiates the voltage. Good phone and charger. If I were you I would get a few extra charging cables for the phone.

Ron
 

Jon Chandler

Joined Jun 12, 2008
293
It looks like the A21 doesn't use USB-C PD (Power Delievery) changing but the older QI protocol, at up to 15 watts. At any rate, 9 volts is normal.
 
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