The S5 Mini's battery must be installed by the user before firing up for the first time. We pop it in—and then claw it back out for some analysis.

Our initial analysis says it's smaller than the battery from our Galaxy S5, but we flip them over to make sure.

Yep, it's smaller.

The Galaxy S5 Mini's lithium-ion battery is rated at 2100 mAh, 3.85 V, and 8.09 Wh.

Then again, the iPhone 5S's diminutive battery clocks in at just 1440 mAh.

Capacity is one thing; how you use it is another. Will the Mini's smaller screen and slower processor make up for the lower capacity battery?