Replacement NiMH Battery for iRobot Roomba 500 510 521 527 530 531 532 533 535 536 600 610 618 620 650 655 660 700 760 770 780 790 800 870 871 880 R3 Pet Series Blue 14.4V/4400mAh (Blue)

What buyers think

Buyer-review evidence is limited in volume but consistently points to a practical pattern: when the battery is seated correctly, charging can work normally and the Roomba can run again. Several buyers describe easy installation and quicker charging behavior. A small number of reports highlight that a “charging error” or imperfect fit may be resolved by improving how the pack sits in the compartment, suggesting installation alignment matters more than raw battery specs.

Who this battery is for

This replacement NiMH battery is meant for homeowners replacing the original battery in supported iRobot Roomba models in the 500, 600, 700, 800 series, plus the R3 Pet series. It is a good fit if your Roomba is returning to the dock quickly, losing runtime, or you are simply maintaining an older robot with a fresh battery rather than upgrading the whole unit.

Key specs to check before you buy

Use these specs to confirm compatibility before ordering:

• Battery chemistry: NiMH
• Voltage: 14.4V
• Capacity: 4400mAh
• Battery type: Rechargeable
• Model number (battery pack): 4636434

It is also important to match your exact Roomba model (for example, many 500/600/700/800 and R3 Pet variants are listed), because a wrong-match battery can lead to charging problems or poor contact.

Pros and performance expectations

Most buyers describe the replacement as restoring day-to-day usability, especially for older units that have already used up their original battery life. Several reports mention quick charging and improved runtime compared with the failing original. While the listed capacity and voltage are helpful, real-world results will still depend on how well the pack fits and how your specific Roomba model charges and balances the new battery.

Installation and charging caveats to know

Even when the battery is the correct match on paper, the install can make or break charging. Buyer feedback includes a theme of charging behavior improving after adjusting how the battery sits in the compartment. Follow the practical guidance that comes with the battery, which emphasizes discharging and fully charging before regular use, and avoiding operating the vacuum during charging.

If you see a charging error

Some buyers have reported a charging error message that was resolved by ensuring the battery is compressed and seated properly so contacts engage during the charging process. If charging fails, double-check model compatibility first, then focus on proper seating and contact alignment rather than assuming the battery is defective.

Battery care tips for longer usable life

• After installing, follow the battery’s guidance for initial charge behavior (the pack may arrive with some charge).
• Avoid fully draining the battery before charging when possible.
• Remove the battery pack when the robot is stored for long periods.

These habits are especially relevant for replacement packs, since good maintenance can reduce how quickly you need to replace batteries again.

Price and availability

Pricing and stock can change frequently. Check the current listing for the most accurate cost and availability window before you commit to the purchase. Buy on Amazon

Verdict

The Replacement NiMH Battery for iRobot Roomba 500/600/700/800 and R3 Pet models is a practical option for restoring older Roombas that have lost runtime. It appears to work well when compatibility is confirmed and the battery is seated correctly for charging contact. If you are comfortable with a careful DIY replacement and you can match your Roomba model precisely, this is a reasonable buy.

FAQ

• Does this battery only work for the Roomba 500 series?No. It is intended for multiple Roomba lines, including many models in the 500, 600, 700, 800, and R3 Pet series. Verify your exact Roomba model compatibility.
• What voltage and capacity should I look for?Look for a 14.4V NiMH battery with 4400mAh capacity, matching the listed pack specifications for this replacement.
• What should I do if the battery won’t charge?Start by confirming you ordered the correct battery for your Roomba model, then focus on correct seating and contact alignment during installation. Some buyers report improved charging after making sure the pack is properly compressed in the compartment.
• How should I charge it after installing?Follow the included guidance, which emphasizes the initial discharge and full-charge process and avoiding operating or pressing the battery button during charging.