I was skeptical at first—how could a third-party battery possibly compete with the OEM one? But this 4500mAh Ni-MH replacement proved me wrong. My Roomba 650 went from barely lasting 15 minutes to cleaning non-stop for nearly 45 minutes. The difference was night and day.

The installation was hilariously DIY—no instructions, just two screws and a strap to yank out the old battery. Pro tip: Loosening the case screw slightly fixed my initial Error Code 3 glitch (weird but true). The included side brushes were a sweet bonus, though they only fit my neighbor’s 600 series.

Charging feels faster than the original, and there’s no ‘memory effect’ anxiety—I can top it up anytime. After 3 months, it still holds charge like a champ, though my Roomba now requires a gentle nudge to dock properly (blame the bot, not the battery).

For the price of a fancy dinner, this battery resurrected my ‘lazy maid’ Roomba. Just remember to charge it monthly if unused—unless you enjoy playing robotic defibrillator with your vacuum.