You tried 14500 batteries in a regular AA battery charger? I'm not a battery expert, but your AA charger probably won't supply enough voltage and may employ charging algorithms that are not suited to the 14500 batteries. Maybe I'm paranoid but i would not put batteries in a charger unless I know for a fact it was designed for the batteries I'm trying to charge. It's a really bad idea to experiment like that unless you know alot about electrical engineering and battery chemistry. If you put batteries in charger the charger wasn't designed to charge, the batteries could explode.
The Pila charger charges at 600 mA, which is extremely close to the rated mah of your batteries (which is obvious because it only took about an hour to charge the batteries). Ideally, you'd want the charger to take 2 or 3 hours to charge. I think the Pila may be a little strong for those batteries, but it should still work. 1 hour charging will generate heat and is hard on the batteries. Always charge with the top cover open to let heat escape.