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

New product can work for 4 hours. I almost never use this robot... maybe once every 3 weeks. Either way, this battery lasts 4 hours new, just like an OEM battery. At eight months, we'll be lucky if he gets out of the fridge and into the sink before he dies. If we go back to OEM, even at 3 times the price, it lasts 3 years, just like the original battery. Much luck.