Review on Powerextra 7.2V 2200mAh Replacement Battery for iRobot Braava 320/321 & Mint 4200/4205 by Stefan Eddy

compared the size in all measurements it was the same but MUCH more capacity in mAh. I haven't done any actual testing as my MINT vacuum isn't working for reasons unknown. It has not been used for years and may have internal problems. I was pleasantly surprised that the battery that just came out of the box didn't need to be charged - the blue light on the vacuum came on immediately. But still had to charge it.