Iqoo9 has been used for three months. How much battery health is left?

Iqoo9 has been used for three months, and the battery is healthy below 99. After using iqoo9 mobile phone for about two or three months, the battery health will drop to 99 or below, that is, after long-term use, the health and durability of some batteries will decrease and the battery density will be lost. Replacing a brand-new battery product can restore the mobile phone to a fully charged state.