Eventually, we're able to pull out the 3.8 V, 2100 mAh battery.

Just like Apple did with the iPhone 5, LG is utilizing a 3.8 V battery to power the Nexus 4.

Unlike Apple, however, LG manufactures their own battery.

Strangely enough, Google doesn't list any specifications for the battery on their product page. We'll have to rely on real-world tests to see what kind of battery life users can expect to achieve.