The phrase "a batch of about" is correct and usable in written English.
It can be used when referring to an approximate quantity or group of items or people.
Example: "We prepared a batch of about twenty cookies for the bake sale."
Alternatives: "a group of approximately" or "a collection of around".
The Humvees observed near the front of the fighting were part of a batch of about 100 sent to Ukraine earlier this year.
From a batch of about 20, it was whittled down to two contenders - The Siege of Krishnapur by JG Farrell and The Black Prince by Iris Murdoch, with Farrell winning by a whisker.
The clams, on this morning a batch of about 7,300 mostly large chowders freshly dug by hand in Greenwich Cove in Connecticut and rushed in sacks to the West Avenue dock on the shores of Great South Bay, would once have been coals to Newcastle.
When the photographer and fine artist Graham MacIndoe found a batch of about 30 heroin bags in his personal storage, he was understandably a bit alarmed.
The RDD contractor also generated a batch of about 300 random numbers from marketing sources to increase the number of calls to households with women aged 65 years and older.
Later we encounter the Sargents, also friends of the Blodgetts, in a batch of stories about lonely characters making an effort to connect with distant loved ones.
There were traces of this dissatisfaction on the group's last album, "A Little Bit Longer," which was released last summer, particularly on the track "Video Girl," a shocking lump of cynicism dropped cold in the middle of a batch of songs about enthusiastic, incomprehensible love.
Later, MacIndoe found a second batch of about 50 to 60 glassine bags stashed in a book.
A new batch of about 50,000 tickets to events in the Olympic Park - including 25,000 hockey tickets plus seats for diving, water polo and basketball - are on sale, Locog has said.
One sowed doubt about one of Cohen's central claims, that Trump talked to friend and adviser Roger Stone about WikiLeaks's plan to dump a batch of damaging emails about the Hillary Clinton campaign before they were released.
Carter told the Commons defence committee that the remaining cadets of an initial batch of about 300 would leave "within days".
