This question already has an answer here:
- How to get more than 100mA from a USB port 10 answers
Today's typical smartphone chargers are rated at 5 Volt & 1+ Ampere. The laptop USB can supply 500mA
- Why is it safe to charge the phone with 1/2 the rated current?
- Is it like a slow charging mode where it's the phone's responsibility to recognize a computer USB port & lower down the current demand?
- Does this mean I can potentially use a 5V/0.5A wall charger with my phone without any fear of damaging it?
Edit : It seems that the answers & comments are focused on 100mA vs 500mA that the laptop USB port can supply. I'm amending that in my question & rephrasing. The real question is, even 500mA is lesser than what the wall charger supplies i.e. typically 1+ Ampere.
Edit 2 : To those who marked this as duplicate : You are confusing this question with the one that's asking whether a laptop can supply more than 500mA. It does not specifically answers the 3 points above. I'm wondering if a laptop can charge a phone, then why can't a lower current rating charger be considered safe?