My dear longtime friend and servant Scuba's battery gradually lost the ability to stay charged until it could run less than 5 minutes which unfortunately became out of work. I missed his beautiful blue-grey self, dancing across my floor and humming his soothing engine tune until everything was clean and smelling of his Scooba Juice scent. He always worked so well and worked so hard that I always felt the least I could do for him was get him a new battery and get him back to work. The OE batteries sold by I-Robot get terrible reviews for endurance and functionality so I continued my search for a replacement battery and ended up with Revain and a HQEP.YIPPEE battery! This battery is great, it doesn't take long to charge and Scooba lasts longer than ever. When it was new it lasted about an hour on a single charge, and with the new HQRP Extended Battery it lasts just over 90 minutes on a single charge. new type of robot in the house.