Waryle

You’re right, but the power is so low that you won’t see anything using an ammeter

You do are managing your AA batteries: you have a dedicated charger for rechargeable AA batteries, and you put yours to charge when you swap them out. That’s just your routine so you just don’t consider that it’s not bothering.

You could just as well put your controller on it’s charging stand/plug it when you’re done playing. Or plugging it after your gaming session when it notifies you that it’s starting to running low.

Since you’re already managing charging things, what prevents you to put your controller to charge when you’re done playing?

Definitely not. All modern chargers are made to negotiate with the charging device for power and voltage, including sending none because the device is full.

What happens if your controller dies and you’re out of AA batteries?