I have the Hixon and Kratax AA(3500mWh) and AAA(1100mWh) batteries, they work wonderfully in everything i have.
The battery charger uses USB C and is the white Kratax one, it is far better than the Palo and other smart chargers i have tried and fully charges the AAA and AA batteries, where others do not.
The lights are red for charging and turn green when fully charged, just insert the battery, do not worry about putting it in backwards, the light goes off, though you might have to power off and back on again the charger. What is nice about the Kratax/Hixon batteries i have is that they have a light internally and it flashes on charge and goes off when fully charged. You can insert as many as you like from 1 to 4 as they are independent charging slots and can charge any combination of AAA or AA batteries.
The nice thing is that they have a slide so the battery always sits flat, with some other chargers the AA battery pops out as it is on an angle.
I have this plugged into a QC 3.0 USB adapter and it works fine.
Overall i like these batteries and the charger is fast and just works.
The only wish i had is that it could do with indication of how long is left to charge, however that is a nice to have, otherwise it does the job.