Battery Simple Pack for Comfort / Motion / Delta P / Temp IP68 / Pulse IP68 / Dry Contact IP68 (Description: Li-SOCl2 Battery Pack D18.5 3.6V 3.8Ah 13.68Wh Li 1.0g / ER18505H soldered with 36mm cable + Molex 51021 connector) 8€/pcs