For iRobot For iRobot Roomba 500 600 700 800 Series 14.4V 3500mAh Ni-MH Battery Replacement BAKXMM80489 0 Review(s)  $47.84 100% compatible replacement. High-quality Ni-MH battery replacement. Long battery life, high capacity – 3500mAh large capacity for long-time use. Intelligent program protection prevents overcharging. Compatibility with the original, No memory effect. Add to cart