My battery when down to 90% health after a month of use and I just checked it and its back at 97%, If it doesn't go under 80 % theres no need to lose sleep
Your battery health is referred to either as a percentage or in mah and represents your current full charge capacity (mAh) as compared with the ideal full charge capacity (100%). Be aware that battery readings are not 100% accurate, so if your brand new battery health is somewhat less than 100% or if it fluctuates up and down over time (100%, 96%, 99%, etc.), don't worry. This is completely normal.