Battery health dropped from 98 to 96 after 10 cycles in 10 days

Yes, it's normal. Changes in battery health are not linear. The figure can remain without change for days or sometimes even weeks and then will take a sudden drop, or sometimes even increase a bit. It's all in how the power algorhythms do their analysis and calculation. It's not a precise science. On average, Battery Health will decline about 1% for every 25 charge cycles, so over 212 charge cycles your iPhone is actually better than average.

Regards.

WOW. That phone has undergone over 200 cycles and yet, its battery health is at 96? That's AMAZING. You should send flowers to Apple. For every 25 cycles, it's common to see a 1% decline in health. 212/25 = 8.48

It would be more common to see a battery health of 92 on a phone with 212 cycles. Your battery is doing an amazing job.

They will see the battery health percentage and tell you that it is fine. There is not a problem. It is not below 80% which is when it would indicate the battery needs to be replaced. The percentage is not linear and at times you may not see a drop at all (it would stay at the same percentage for months for example and then you may see months were it drops more than you were used to). This is not abnormal.

You can expect battery health to decline 1-2 percent each month with normal use.

I have the same issue