Can I connect my mobile phone charger (5V 6A) to my laptop (input 15V 3A)? Because maybe because of Volt
No, that's not how it works. The plug polarity and the voltage must already match. If the power supply is more than 3 amps, that's fine.
What are you hoping for from the venture? In any case, the laptop will NOT be charged with it.
No chance…
Too little voltage & some laptop power supplies send an adapter ID because of the available power of the power supply… Buy a used original power supply (& avoid cheap garbage from China)
Too little voltage & some laptop power supplies also send an adapter ID because of the available power of the power supply…