iRobot Original Li-ion Battery 3300mAh/14.4V Roomba 680, 690, 890 and 900 Series
iRobot Roomba 500 - 900 series and iRobot Braava 240 - 380 Original Battery | Lazada
Amazon.co.jp: [Genuine Product] iRobot Roomba Lithium Ion Battery and 800,900 Series Compatible Filters (2 Pieces) Set (Compatible with 800/900 Series) : Home & Kitchen