iPhone 6s battery, one-year warranty

Description of the battery for iPhone 6S device, 12-month battery warranty, at Rezan Store. It is recommended to install and change the battery by a specialist for your safety. It shows the battery charge level, but the battery health percentage in the settings does not appear. However, the battery works correctly, and the reason for the absence of the battery level percentage is due to a system from the device's manufacturer. (A message appears on modern devices after changing the battery indicating that the device cannot verify the battery). Ignore this message and use the battery, and do not worry.