When the mobile phone is cold and shut down, it is actually the common fault of most mobile phones, which is related to the characteristics of lithium-ion batteries. Lithium battery depends on the mov
Nowadays, with the increasing popularity of smart phones and the continuous expansion of application scenarios and functions, smart phones have become an indispensable part of people's daily life.
The following waterproof grades refer to international applicable standards such as IEC 60529, GB 4208, GB / T 10485-2007, DIN 40050-9, ISO 20653, ISO 16750, etc1. Scope: the waterproof test includes