Review on Hanaix 4800MAh Replacement Battery IRobot by Brandi Walker

What is the larger battery in the 4000? The costs are higher. day, and to charge it he worked an hour and 15 minutes. It then takes another three to four hours to recharge. If you unplug it and leave it overnight and presumably it was fully charged, plug it in in the morning and it's dead again, it takes another three to four hours to charge it, it won't hold a charge. I wish I could send it back but I can't reach people right now