In Soundcore Liberty 2 There is a battery issue in it. The right earbud battery is not same as the left ones

Is it just my or common issue in Soundcore Liberty 2 There is a battery issue in it. The right earbud battery is not same as the left ones, the right earbud battery backup is 5.5 hrs and left earbuds battery backup is 8hrs there is a huge difference in it. Is my earbuds defective please help me with it…