Question Need explanation about 5v 9v 12v on smartphone charger

Apr 12, 2021
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Hello, i just joined today and this is my first post. So, i buy a phone from my friend a week ago, it's Vivo V15. The problem is my current charger charge my new phone at very slow speed (only 15% overnight). Long story short, i search online for charger and got some number, 5v/3A 9v/2A and 12v/1.5A, what are these? I'm looking for 18w charger but got this instead.
 
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