Effekta battery 12V 20Ah (suitable for cyclical use). - Dim. (LxWxH) 181mmx77mmx167mm. - Weight: 5700 gram. - Sunk flat poles with a 5.6mm hole. - for Ventus ct, Ventus 2ct, Ventus 2cxt, Duo and many other gliders. Replaces BT 12-18.