It did come with a battery pack however I have just used 2AA. I tryed charging the battery pack but it got very hot. If you use batteries, the only ones that really last at all and work the best are Duracell.
I ordered this camera used and it did come with a battery pack, but since it was used the battery pack was past its prime and it didn't really hold a charge like it should. The 2AA batteries work great in it. I am glad there are two options that you can go with. This camera is really fun to use and very easy. You will like it.
Battery pack you charge with computer usb port or I bought a AC plug in that you plug the USB into to charge HD Flip. I learned something here, I didnt know you could put batteries in it, I have never had any problems with charging in computer.