Batch Five units first entered service in August 2015. These buses were powered by the Volvo D9B310 EC06B engine (9,364cc) which is Euro V compliant with the use of Selective Catalytic Reduction (SCR) technology, requiring the use of Adblue. All Batch Five units were fitted with the 6-speed ZF EcoLife 6AP 1403B automatic transmission automatic transmission. They were registered from SBS1Z onwards, which was previously used by its predecessor's (Singapore Bus Service, or SBS) historical fleet.
Air-conditioning was supplied by Denso of Japan. Batch Five units had revised interior features as compared to previous batches, including a new straight staircase and headrests on side-facing priority seats (similar to the Volgren-bodied B10TLs). All Batch Five units have a full low-floor interior configuration on the lower deck, and had their EDS supplied by LECIP.
With orders totaling up to 1,415 B9TL WEG2 buses for SBS Transit and expected to be fully delivered by 2017, this makes SBS Transit one of the largest Volvo B9TL operators in the world.