The Xiaomi 15 is IP68 water-resistant, and every device undergoes rigorous waterproof inspection before leaving the factory, so there is no need to worry about its waterproof performance. Regarding the slight gaps at the four corners of the battery cover, these are designed to balance manufacturing tolerances and enhance drop resistance. These gaps do not affect the waterproofing and remain within our quality standards. Please rest assured and enjoy your device. Thank you for your support.