This happened to me not 2 months ago. Both the rear light indicator and the battery indicator came on. Mine turned out to be a bad alternator. My rear lights also happened to work properly as well.
When you started it, did it start alright? As in, did it start normally?
Also, are any of your interior lights dimming when you apply the brake?
If so, I would say first off, to be exactly sure, go get your battery and alternator tested at either Autozone or Advanced Auto Parts for free (and possibly the starter if it had trouble starting). Although I wouldn't put 100% stock in what they tell you, they usually are pretty accurate. I only say this because mine turned out to be the alternator that was bad and the test they did for me came out with a bad starter first, which was actually fine.
If it turns out to be the alternator, it isn't all that hard to buy and install yourself. I paid around $100 for a remanned alternator at Napa (not counting the core, which you'll get back if you bring in the old one obviously). The install took about 40 minutes, however it would've taken only around 20 minutes if only because mine was a bitch to line up the mount holes (it was a really
But I would say start with getting those tested and see what it comes out with. I hope I helped. Keep us updated.
EDIT: whoa, just realized this is from November...whoops