I'm a Vowel AND a Battery - WOO!

Strange conversations can be heard in an office after hours:
e: So Erin, how are you doing?
e²: Oh, not too badly. Yourself?
e: Yeah, the same.
e²: No kidding? You know, you probably shouldn't be talking to yourself.
e: So they say, but I heard that talking to yourself is perfectly normal and perfectly sane.
e²: Unless you...
e: Exactly, unless you answer yourself.
e²: Wow, you're rude! You even interrupt yourself.
e: Whatever. Shouldn't you be working already? I really don't want to stay much later if there's only you for company.
e²: Tell me about it! I know exactly how you feel. If you think you have it rough, you should try being in my shoes.
e: Ugh, you're in heels. Nasty toe pinching, arch aching, e-vile shoes that throw your back out of alignment.
e²: Don't blame me! You're the one who put them on your feet.
e: Oh sure, how is it that they always become my feet and my fault when they hurt... but your feet when they're getting a massage?
...
e: No response, huh? Exactly. Anyway, you can catch your own ride home, but I'm heading out.
...
...
e²: (Stupid head)
e: I heard that!