Raspberry Pi 3 B+ can't be powered by battery using regulator 7805 and LM2596, requires higher current. Help!
LM2596 runs quite hot at 2.5A, I went with a more powerful "5A" XL4015 module that only gets warm when delivering 2.5A the price diference is only a few cents.

Set to 5V before connecting the Raspberry pi 
(you'll need a voltmeter)