XS Power A3400 12V BCI Group 34 AGM Starting Battery, Max Amps 3,300A CA: 1,150
Amazon.com: 3300mah 48Wh Replacement Parts 3300 Lithium Ion Battery for iRobot Roomba 985/980/960/600/800 Series Robots 614/615/640/652/665/670/671/675/677/680/685/690/695/801/805/850/860/877/890/891/895 : Home & Kitchen
AKKU 22704: Li-ion battery, 18650, 3.7 V, 3300 mAh, includes MicroUSB chargi at reichelt elektronik