In The Unicode Standard, Batak script implementation is discussed in  Chapter 17 Indonesia and Oceania.

The Batak script was encoded in The Unicode Standard version 6.0. The script is encoded in the following block:

BlocksCharacter RangeAdded in Unicode VersionUnicode Chart
Batak 1BC0..1BFF 6.0  U1BC0.pdf

Subsequent to version 6.0, the following characters have been added to the Batak script:

CharactersUnicode VersionDocumentation
1BFA..1BFB 6.1  n3320.pdf,  L2/08-011

Documentation refers to  ISO Working Group and Unicode proposals

A number of proposals for its inclusion were submitted to the Unicode Technical Committee and WG2:

1992-10-23 Batak — Rick McGowan ( Unicode Technical Report #3 R2)

1999-02-11 Batak script (preliminary chart) — Michael Everson ( L2/99-066)

2007-07-26 Preliminary proposal for encoding the Batak script in the UCS — Michael Everson ( WG2 N3293,  L2/07-233)

2008-04-14 Discussion of Batak Vowel Ordering — Rick McGowan, Ken Whistler ( WG2 N3446,  L2/08-147)

2008-08-04 On the inputting model for Batak — Michael Everson and Uli Kozok ( WG2 N3489,  L2/08-274)

2008-08-11 Batak Input — Deborah Anderson ( L2/08-312)

2008-10-07 Proposal for encoding the Batak script in the UCS — Michael Everson and Uli Kozok ( WG2 N3320,  L2/08-011)

2009-01-29 Dialect-Specific Characters in Batak — Deborah Anderson ( L2/09-063)

2011-03-03 Indonesian and Philippine Scripts and extensions not yet encoded or proposed for encoding in Unicode — Christopher Miller ( L2/11-091)