Macbook Air (M1) battery health

I've been using my Macbook Air(M1) for a year and I recently I found out that the battery is draining rapidly when unplugged. I've checked the cycle count which is 163 which seems to be normal ,but the maximum capacity dropped to 86% which doesn't seems okay to me. Most of the times I use my macbook with the power adapter so I don't expect the battery health to drop that much . May I know if this battery condition is normal or should I send in for repair?