After saying the magic words, the 43-gram, 4.7" x 1.9" x 0.13" battery mystically lifts off the rear case enclosure.

Between the larger battery and improvements in power efficiency, Apple touts a talk time of up to 24 hours on 3G, and 384 hours of standby time.

The battery found in the Plus is larger than the standard iPhone 6's 6.91 Wh, 1810 mAh battery—which explains the longer life, despite the much larger screen.