1998 Dodge Durango Volt Regulator Problem/Battery?

I never had a starting problem until one evening when I left my lights on overnight. The next morning when I realized that my battery has died I decided to use my AC Battery charger to jump my truck. It worked and the truck drove fine and it never stalled. However, the next following morning I barely was able to start my truck. When the truck is running my volt meter stays at a 14 volt reading and does not stall. I know my battery is not fully recharging but I do not think it is the alternator because the truck does not stall when it runs. Could I have damaged the volt regulator or maybe need to replace my battery or maybe both? Thanks!