To the Apple rep here. Worked in IT and hated my monthly rotation when I tested as a cust. supp. level 2 rep. It is stressful and I agree - be prepared to wait or have Apple call back. When I was looking for a job, I considered cust. supp. for a brief time and warned my spouse I'd be stressed out if I took the job, so again, I understand. But I'm a user and this is different.
Some counterfeit and third party power adapters and batteries may not be designed properly and could result in safety issues. To ensure you receive a genuine Apple battery during a battery replacement, we recommend visiting an Apple Store or Apple Authorized Service Provider. If you need a replacement adapter to charge your Apple device, we recommend getting an Apple power adapter.