We can use standard flash chargers safely and efficiently. And non-standard flash charger, without any test is likely to lead to various problems. For example, it can lead to a long charging time, affect the durability of the mobile phone battery, and the safety of the mobile phone.
Operating the phone while charging is a discharge process. Operating the phone while charging means that charging and discharging cancel each other, and the charging time is naturally extended. Frequent charging and discharging of the mobile phone may affect the durability of the mobile phone battery, resulting in longer charging time. So we try not to use our phones while charging.