Choosing the right zener diode?
I want to make a power bank kind of thing that can charge my laptop. Its not at all efficient and a powerbank or rechargable batteries would be better but its a challenge kinda thing. Due to my research I found out that zener diodes can not only prevent backflow but also limit the current. So I was wondering if you guys could help me choose a zener diode. I have attached a picture of the schematics. Please don't comment saying that its not efficient and stuff, I know that. ( Extra info: laptop requires 20 volts 2 amps)
Thanks in advance :).