Super easy to install. If you follow the instructions about how to charge the battery your Roomba will run longer.Charge it fully and then run down fully 4 times and then set it on your schedule. The battery will last longer over the 4 times you train the battery. My run time lasted 3+ hours the second time I charged it after 2+ hours run time the first time. I will revisit this later but in my experience it works out better than the original battery ever did.