Review on Hanaix 4800MAh Replacement Battery IRobot by Miranda Warren

Longer runtime than factory battery. Slightly heavier than the original. The user manual recommends fully charging before installation. Use Roomba (1, 2, 3 times) without charging until it turns off, fully charge again, and don't charge until it stops. This is a cycle. Do this 3 times to get the battery working, then you can leave it charging when not in use.