The Galaxy S21 series seems to be in development. Today, the batteries of the Galaxy S21 and Galaxy S21+ have been leaked through 3C certification.
The first certification is for the Galaxy S21+, which includes a 4660mAh battery. The EB-BG996ABY battery consists of the model G996 of Galaxy S21+, which also indicates that this is the Galaxy S21+ battery.
The second certification is for the Galaxy S21, which includes a 3880mAh battery. The model number EB-BG991ABY also consists of the model G991 of the Galaxy S21.
Surprisingly, neither battery is manufactured by Samsung. The applicant for both batteries is Ningde Amperex Technology Limited, which is a famous Chinese battery manufacturer. Both certifications were issued on September 3.
Previously, it was reported that the Galaxy S21 series would include three variants: S21, S21+, and S21 ultra. The Galaxy S21 series will have a codename Unbound with the following variants: M1, N2, and O3. The O3 variant may arrive with an S Pen, which seems to be Galaxy S21 Ultra.
Currently, there is no more leak or official statement regarding the phone.