My battery capacity on my Macbook Air has dropped to 96% after 23 cycles

Yes, this would be considered "normal." Apple does not consider that a Mac laptop's battery would require replacement unless it cannot maintain, at least, an 80% charge after 1000 full recharging cycles.

Ambient & actual operating temperatures are factors, but this is typical for any batteries.

The following support articles may provide some helpful insight on what to expect from these batteries.

Ref:

• Batteries - Maximizing Performance - Apple
• About battery health management in Mac notebooks - Apple Support
• Determine battery cycle count for Mac laptops - Apple Support