Hello Sataporn, Thank you for contacting Technical Support. Sataporn, if you suspect that the battery has been swollen, then you may replace the unit as per the article TS2358. As the unit is still within 3 years from it's date of purchase, so there is no of CS code to replace the unit. Please refer the article TS2358 and proceed as per the article. And, as per the case 733904640, we do not see any CS code being issued to replace the unit. Case#: 734111211 Regards, Pavan. If you would like to send us a reply, please ensure the "Status" field is selected as "Open" and "Escalate To" field is selected as "Apple”. If you feel your issue is now resolved, please ensure the “Status” field is selected as “Closed”