2. What is the biggest thickness of the Markyn curved battery? According to the dimension, what the biggest capacity we can make?

The max. Thickness should be less than3mm, it is hard to control if more than3mm. According to the following format you can get the capacity from your needed dimension:

Capacity=TXWX(H-8X0.1)

Note:  Height is less than45mm, thickness is between 1 and2.5mm.