For issues related to normal charge:

Handset not charging
Handset charging slowly
Charging not full

1. Please back up all of your data, clear the cache and flash to the latest OS version.
2. Check if the device has any battery drain issues. When the phone consumes battery faster, it results in slow charging.
3. Verify whether there are any third-party power management software apps downloaded, please uninstall these.

Finally, If the issue can not be solved using the steps listed above, we recommend applying for after-sales service.