Careful with that one. The Pila is not designed to charge 3.0. Doing so may appear to work, but isn't safe. A lot of the sizes that are available in 3 or 3.2v are also available in 3.7v, so the size is generally not enough info to know which charger.
That's true, good catch, erich. All mine are 3.7 (rated), so they charge fine. There are, however, hobby chargers that have selectable volts and amps for charging many different batts. I'm not familiar enough with them to know if they will do 2 different batteries at the same time. The Pila will, though, charge virtually any 3.7 batteries, even 2 different sizes at the same time. (For example, an 18650 and a 14500)
I should correct my mention of CR123a types as being too general. Specifically, I use it for 16340's and 18350's, rated at 3.7v for the Screwdrivers (along with 14500's and 18650's, rated at 3.7v for the REOs)
ETA: I should add, too, that I always keep an eye on them as they charge, as well as checking them with a meter before and after charging.