Rechargeable battery gives you 25% more cleaning time than Braava 320 or Mint 4200, lasting up to four hours dry mopping and up to two and a half hours damp mopping on a single charge. Battery charges in as fast as four hours with the adapter or in just two hours with the Turbo Charge Cradle. Compatible with Braava 380t and Mint 5200. What's In The Box: 1 2000 mAh NiMH Battery For Braava 380t or Mint 5200 The iRobot limited warranty shall not apply to failures or problems which are caused by products or equipment not authorized by iRobot Corporation.