Deda di2 battery adapter for seatpillar the innovative deda battery adapter dba for seatpost offers a handy and light system for new generation of shimano di2 internal batteries the adapter fixing system inside the seatpost tube allows a safe battery installation material elastomer in thermoplastic rubber length 70mm diameter 272 e 316mm weight 10g 272mm finish black compatible with all deda elementi seatposts with 272mm and 316mm diameter