Is this in use:
I just had a batch of grapes.
"A bunch of grapes" is possible.
A vineyard might find that it had a batch (part of a crop) of grapes which went off or were unusable in some way. I have no idea if the term is used in a technical way in viniculture. However, the usual term, as bhaisahab said, is "a bunch of grapes". Like this one.
Remember - if you don't use correct capitalisation, punctuation and spacing, anything you write will be incorrect.