Great price for a little charger. Now cheaper than it was before.
Does not come with a power supply.
Only slot #4 support 2000mA current
1000mA can only be used with one or two batteries on the charger.
700mA can be used with up to 3 batteries.
500mA can be used with all four batteries.
In case you need more power per slot (and an included power supply) I would go for the LiitoKala Lii-500 for $24.63 at TomTop ( https://www.tomtop.com/p-l2141eu-1.html ) But is has a EU Adapter.
I wouldn't trust this with a AAA, let alone an 18650 (or several).In circumstances where you're dealing with what is literally a miniature explosive if charged incorrectly, you should really spend your money wisely.