Review on Tenergy 7.2V 2000mAh Replacement Battery for iRobot Braava 380 380t 390 390t & Mint 5200 5200B 5200C – Enhanced Power and Durability! by Courtney Johnson

For new Brava/Mint this might work. But for me, the older Mint 5200, this robot doesn't work that well with a non-original battery. A few days later it stopped charging from the docking station, I had to charge directly. Then this direct charge failed. The Mint 5200 screamed the entire time it was charging (as if it was being unplugged and then plugged back in) this indicates the circuit is open-closed-open-closed-open and so on when charging this battery will. I called iRobot, they said my Mint now needs to be replaced as I have been out of warranty since 2014.