Does it matter if the percentage of apple 12 cushion pool drops by one grid?

It doesn't matter. It is normal for the maximum capacity of Apple 12 battery to drop by one grid, because the battery is worn out. In fact, the maximum healthy capacity of this battery comes from the data of the battery chip, which records the charging and discharging information of the battery and controls the efficiency of the battery. However, the battery health of iPhone is only a reference, not the only criterion to judge the battery status.