Hello guys, I wonder if you can help me at all. I have received a battery charger pack (6000mAh) for mobile phones, tablets and cameras, here is a screenshot of it
It has several connectors and can charge differend brands like apple android etc. OK, so I have a OPO device with android (battery 3100mAh), and I'd like to use the battery pack to charge it but as you can see from the picture it has 2 outputs: 5V 1A and 5V 2.1A. Unfortunately electronics isn't my thing, so I had a look on google but frankly I got more confused than before, and read that i need to make sure I use the right voltage otherwise I screw the phone battery: so, my question is, which output should I use with my OPO phone, and, more generally, which output is used for which device? Is there a rule of thumb of some kind?