We've been using the trash can for about a year. We never need to buy any battery since we've been using the included AC adaptor. Also, we can stuff more garbage in this trash can than our old 13 gallon to save on trash bags. We love the touch free feature of the lid to reduce hand washing after putting in trash and save on water. Since we don't touch it, it is still working the way when we first used it. I really look forward to using it for years to come without buying another step-on trash can. Overall, we consider this trash can an eco product in additional to our recycling effort to save our planet. You should join us and use this trash can!