Got a Deka also with no issue, but that be said, my last one was a Wal-Mart special that went over 2.5 years with no issue and the only reason I changed it was due to going on long trip and figured, did not want no issue. But it started the Mastiff right up, never failed and was cheap.
Also all my previous we Big Dog labeled and never had issue with them either.
Oh most of the batteries will be AGM (Absorption Glass Mat), even the original BD was! AGM are pretty much the some as old lead acid but have mats in them verse free floating acid, and are designed to never need servicing and not leak acid like the regular lead cell.