As of now, there is little research done on the language and is currently being studied and surveyed by organizations like FLI (Forum for Language Initiatives), a Pakistani linguistic resource center based in Islamabad.2 The language is currently unwritten however may finally have one in the near future.
Bateri at Ethnologue (18th ed., 2015) (subscription required) https://www.ethnologue.com/18/language/btv/ ↩
"FLI Bateri Status". https://fli-online.org/site/bateri/ ↩