found something in the Acer warranty that caught my interest, item no. 6f
http://www.acer.com.my/ac/en/MY/content/warranty

This warranty shall be rendered null and void if :
The Product is not purchased from Acer or through Acer's authorized distributors and resellers.

how to check if the seller is authorized?

where to check what component/hardware is included in the extended warranty? i read before the built in battery is not