Portable Sanyo NC-MDU01 USB AA/AAA charger
This little charger is about as basic as they come while still being a smart charger. It came in a bundle deal with 2 batteries and I picked it up around 2010. Still works great and I keep it in my backpack at all times for charging in a pinch. Only downside.. Can’t charge AA and AAA at the same time, can only do one or three other type of battery. Thankfully, I’ve never needed to do that, so no complaints here.