The standard voltage of lithium-ion batteries is 3.7V, and the maximum charging voltage is about 4.2V.
The standard voltage of the phone's lithium-ion battery Samsung laptop is 3.8V and the maximum limited charging voltage is around 4.35V. The standard voltage for lithium-ion batteries is 3.8V and it is perfectly possible to use a charger producing 5 V. I am currently using a Samsung mobile phone. The battery inside the phone is the same as your photo and the charger is a 5V/1A square head.
Why is it used this way? Indeed:
1. To fully charge the battery at 4.35V, the charger voltage must be higher than the battery's 4.2V voltage. To ensure the battery is fully charged, if the charger voltage is also 4.35V, there will be no voltage difference between the battery and the charger, and no current will flow through it.
2. LThe output of the charger is 5V. After inputting the mobile phone, part of it is diverted to the mobile phone and part of it is used to charge the battery. This will reduce tension and tension. the battery charge is no longer lower than 5V.
2. There is also a lithium battery itself with a battery protection board. When charged to a voltage of 4.35V, it will automatically disconnect and no longer charge the battery.
For this reason, Samsung's original cell phone charger uses a charger that outputs 5V/1A.