After more than 3 years of use, my iRobot 780 not turned on its base and struggled in his task after a quarter of an hour. The battery replacement had therefore become imperative. In use, this replacement battery proves nickel. It is more powerful than the original battery, nothing to say, our Roomba walked away even more. Only slight reservation, the shipping container: a simple bubble envelope. A little means for protection, knowing that battery does not like shocks.