Yup that's not a mistake, 4 days of battery life! This is my review of the Ulefone Power 2!
Ulefone Power 2 Specs:
5.5" 1920x1080 px IPS LCD from Sharp
MediaTek MTK6750T Octacore Processor
4GB RAM, 64GB ROM
Android 7.0 Nougat
6050 mAh Battery
220g, 15.50 x 7.76 x 0.99 cm