Where is the suttas is 'sati' defined as present moment awareness? I read the following on the internet:


  About this unusual understanding of sati ("Sati is never present moment awareness") I hope the reader of this answer put some time
  reading the suttas to come to his/her own conclusion about what sati
  can refer to.


Where is the Palis suttas is 'sati' defined as 'present moment awareness'?
Sutta does not define that 'sati' as present moment awareness.
Mindfulness in Buddhist teaching is much more than the english meaning of mindfulness and the the general mindfulness taught in the west.
To understand the meaning of 'Sati' we should have a good understanding of the following two Suttas.

http://www.accesstoinsight.org/tipitaka/mn/mn.010.than.html

http://www.accesstoinsight.org/tipitaka/mn/mn.118.than.html