Review on Maximize Your IRobot'S Efficiency With SPARKOLE'S 5300MAh Extended Life Lithium Ion Battery For Roomba 500-800 Series by Steve Yatnalkar

Got this for our roomba 877, been using daily for a month now and has worked great. No issues. It’s a little lighter than the original, don’t know if that matters. I didn’t care for the original battery, it just seemed slow to me.Update. I purchased this battery june 13 2021. As of nov 2022 it has reached the end of its life. It performed great and one day….roomba didn’t wake up. It served us well and will be missed. As for that original battery, it took a charge and is back in service. The lithium ion battery was definitely perkier and ran longer. I would buy another, but I’m not over ol’ sparky yet…. So, works great and mine lasted 1yr 5 mos of daily service. Not bad i guess.