We were just having a discussion about the Braille = Deka connection on another forum. The Deka version of the Braille is less than 1/2 the cost. For example...
Braille B2618, $208 MSRP:
Braille Battery USA      Lighter • Stronger • Faster - B2618
Deka ETX18L, $80 shipped from Tri-state:
Tri State Battery Online Catalog