There's an adorable plastic pull tab underneath the battery. It's likely there for battery removal, but we aren't sure it's up to the task.

Forgoing the tab in favor of some spudgering, we're able to pry the 3.7 V, 0.8 Wh, 220 mAh battery off the back of the display assembly.

0.8 Wh is more than twice that of the iPod Nano 6th Generation's 0.39 Wh rating.