I've seen hundreds of battery widgets. Maybe more. Still, I've been using Circle Battery Widget for what seems like eons. It's installed on every device I own/have owned, and it ends up on every device that I test, too. Why? Because it's simple, customizable, and tells me what I want to know at a glance. Not only that, but I think the circular graph is an excellent way to output the remaining battery percent.
Then, thanks to a tip from the developer of the app, Battery Widget? Reborn! (no, I'm not a big fan of the punctuation in the name of the app, but that's a moot point) fell into my lap and a new love was born.