Apex domains cannot have CNAME records.
Question and response
Question
dig great-batteries.com. NS
Answer
great-batteries.com. 5 NS ns-127.awsdns-15.com.
great-batteries.com. 5 NS ns-446.awsdns-55.com.
great-batteries.com. 5 NS ns-1099.awsdns-09.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0