Higher display refresh rate – 120 Hz. 2.1x better performance in AnTuTu Benchmark (1282K versus 619K) Better camera quality (According to DxOMark rating) Delivers 66% higher peak brightness (1052 against 635 nits) 41% higher pixel density (460 vs 326 PPI) Shows 12% longer battery life (36:53 vs 33:01 hours) Waterproof body (IP68
A. Battery Drain Info: The iPhone battery will drain, unless it is plugged in and charging. With lots installed, the charge would be slower. As for how fast it would drain the battery, that would depend on the battery health and the volume (sound) you use. Go Here: iPhone Battery and Performance - Apple Support.
Major battery life improvements come to both iPhone 13 and iPhone 13 mini, made possible by A15 Bionic, more efficient components, a larger battery, and power optimizations from a deep integration of hardware and software. iPhone 13 delivers incredible all-day battery life, 4 offering up to two and a half more hours in a day than iPhone 12, andIx3Frf.