Are backup chargers compatible with smartphones?

Question

Batteries

As a solution to the problem of a small battery, I decided to get a "pocket charger". Examples:
dx.com/ru/p/portable-6800mah-external-emergency-po...
dx.com/ru/p/2-x-aa-batteries-emergency-power-charg...
dx.com/ ru/p/all-in-one-mobile-phone-charger-2880
However, nothing is said there about the compatibility of this charger with different models of smartphones (I'm looking for, for example, Sony Xperia V). And I don’t want to kill my battery or something else at all, because the question is: how to find out the compatibility of these chargers with a specific phone?

Answer 1

Take the charger from your phone. It says something like "Out: 5V - 1A". Here are the parameters and navigate.
If your phone is charging from USB, then 0.5A (500mA) will be enough for you, it will probably charge more slowly.

Answer 2

In phones with Li-On batteries, the charger is built into the phone, and outside is a regular power supply (or even a USB computer). From the computer, the phone takes no more than 0.5A (due to USB restrictions), from the charger up to 2A can. The phone determines this by closed or open signals D + and D- USB (for charging with a higher current - closed).
So there is no point in writing about compatibility, the main thing, as they wrote above, is to provide the required current with an external charger and keep the voltage stable.