7.2v Ni-Mh Mint 4200 4205 GPHC152M07 Battery Replacement for iRobot Braava 320 321 Mint 4200 4205 Floor Cleaner Robot 4408927 7.2V 2000mAh 10.8Wh Ni-MH Battery.compatible with Mint 4200 Robotic Vacuum Cleaner(The Battery color random,Blue,Green,Yellow.....) Replacement for iRobot Battery Model/Part Numbers: 4408927, GPRHC152M07. Compatible with the following iRobot Floor Cleaning/Mopping Robot Models: Braava 320, Braava 321, Mint 4200, Mint 4205. Battery will last up to 2-3 hours dry mopping and up to two hours damp mopping and fully charges in approx. 10-12 hours. Over charge and discharge, detection protection,Aging-Test for every battery before packing,High abrasion resistance shell.