Is it possible to perform a batch deletion of subscribers?

Yes, it is possible to perform a batch deletion on large numbers of subscribers, in the same way that you can perform batch registration.

You can sort your subscribers according to various data fields. For example, you can download a list of subscribers whose email addresses have produced delivery errors x amount of times. Since that file is automatically downloaded in CSV format, you can then use the same file to perform a batch deletion of those addresses. It's flexible and easy.