How can I solve the problem of using an old charger to charge new devices?

If you use an existing charger, the charger may fail to provide sufficient charging energy for the device. Therefore, your device may be unable to charge, or it may take longer to fully power the battery.

(* Reference: Use a charger with the same output current as the current value required by your device.
Example: Galaxy S2: 0.7A, Galaxy S3: 1A, Galaxy S4: 2A, Note 2: 2A, Tab2 10.1: 2.5A)

After the above operations are completed, if the device is still unable to charge properly, please send the device and charger to the nearby authorized Samsung service center, the relevant service center information
In addition, be sure to use a charger recognized by Samsung. A charger or cable that is not recognized by Samsung may cause a battery explosion or damage to the device, and no warranty will be incurred for any losses.