Generally, people just need to fully charge their phones once in a day. OISLE's design conception is to find a perfect balance between practicability and exquisiteness, and with the best quality.
For iPhone 5 5S SE (charging about 1.5 - 2.0 times)
For iPhone 6 6s 7 8 Plus X (charging about 1 - 1.3 times)
For iPhone XS MAX XR (charging about 80%-90%)