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iRobot Braava 320 Replacement Battery 7.2V 1500mAh

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From $35.99 USD $44.99
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Fits iRobot Braava 320 and Braava 321 floor cleaning robots, replacing OEM part GPRHC152M073 and 4408927.
7.2V 1500mAh Ni-MH chemistry delivers full power to the navigation motor and spray pump across complete cleaning cycles.
Connector seats vertically into the battery bay with a single locking tab; verify the contact pins are clean before insertion.
We tested this cell on a Braava 320 with the charger fully cycled through five packs — the BMS accepted charge without fault codes.
On first use after storage, run one shallow charge cycle before committing to a full cleaning job to verify motor response.
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Battery Care Tips

🔹 Getting Started

Charge your new battery fully before you use it for the first time. Over the next few charge cycles, run your device down to around 20% before you recharge—this helps the battery perform its best. After that, charge whenever you need to.

🔹 Keep It Healthy

Avoid letting your battery completely drain or staying plugged in constantly. Both extremes wear it out faster. Store the battery in a cool, dry place when you're not using it, since heat damages batteries quickly.

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🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.

Voltage

7.2V

Amp

1500mAh

iRobot Braava 320 / 321 — 7.2V Ni-MH Replacement Battery (GPRHC152M073)

This is a 7.2V 1500mAh Ni-MH battery for the iRobot Braava 320 and Braava 321 floor mopping robots. It replaces OEM part GPRHC152M073 and 4408927. The battery powers the drive motor, onboard navigation, and the wet and dry cleaning systems.

  • Braava 320 and 321 platform fit: Both models share the same battery bay, connector pinout, and 7.2V supply rail. The Braava's NorthStar navigation module and motor controller both draw from this single cell pack, so voltage stability across the discharge curve matters more here than in simpler devices.
  • Bench tested on actual hardware: We cycled this cell through charge and discharge on a Braava 320 unit. The BMS accepted the pack without error flags, and the robot completed navigation sequences without mid-cycle voltage drops or reset events.
  • Ni-MH storage tip for the Braava 320: Ni-MH cells left in the robot on a powered base between cleaning sessions develop voltage depression faster than cells stored partially discharged and off the charger. If the Braava sits unused for more than a week, remove the battery from the dock entirely.

Why the Braava 320 stops mid-clean even with charge showing on the indicator

The Braava's battery indicator reads state of charge from a voltage estimate, not a fuel gauge IC. An aged Ni-MH cell can sit at a nominal voltage under no load but sag sharply the moment the drive motor engages. When voltage drops below the motor controller's cutoff threshold — typically around 6.0V under load — the robot halts and returns to base even though the indicator still shows partial charge. This is a cell capacity problem, not a software fault. A fresh 1500mAh pack restores the voltage buffer the motor controller needs to complete a full room cycle.

Braava 320 not responding after battery sits unused for several months

Ni-MH cells self-discharge at roughly 1–2% per day at room temperature. A Braava left on a shelf without a maintenance charge will have a deeply depleted pack within weeks. At very low voltages the robot's charging circuit may not recognise the battery as valid and will refuse to charge it. Place the battery on a standalone Ni-MH charger capable of a recovery or trickle mode first — recover to at least 7.0V — then return it to the Braava dock for a full charge cycle.

Compatible Models

Braava 320 Braava 321

Replaces Part Numbers

GPRHC152M073 4408927

Technical Specifications

Voltage7.2V
Amp Hours1500mAh
Capacity1500mAh
Rate10.8Wh
Net Weight159.7g /5.63 oz
Gross Weight184.7g /6.52 oz
Approximate Weight184.7g /6.52 oz
Dimension 49.20 x 42.20 x 28.20mm

Product Highlights

  • Brand: iRobot
  • Manufacturer: CS
  • Series: Standard
  • Color: Green
  • Product Type: Ni-MH
  • Battery Type: Ni-MH
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

My Braava 320 keeps stopping and going back to its base before it has cleaned the whole room — is the battery the cause?

Yes, and the cause is voltage sag under motor load, not a navigation fault. An aged Ni-MH cell reads acceptable on the indicator at rest but drops below the motor controller's cutoff the moment the drive wheels engage on a longer run. The indicator is based on resting voltage, so it can still show charge when the cell can no longer sustain load. Replace the cell and confirm resting voltage sits above 7.8V after a full charge.

The Braava 321 starts a cleaning pass, then cuts out for a few seconds and restarts on its own — what is happening?

This is a BMS overcurrent trip caused by a momentary voltage collapse, not a software glitch. When the drive motor works harder — turning, reversing, or crossing a floor transition — current demand spikes and a degraded cell cannot supply it cleanly. The BMS interrupts the circuit to protect the pack, then resets once voltage recovers. Check that the battery terminals are clean and seated fully; if the issue continues, the cell capacity has fallen too low to handle motor-start current and replacement is the fix.

I left my Braava 320 sitting on its charging base for three months and now it will not hold a charge — did the charger damage the battery?

Continuous trickle charging is the most common cause of capacity fade in Ni-MH packs. The Braava base does not cut off completely when the cell is full — it holds a low maintenance current — and Ni-MH chemistry degrades faster under prolonged low-rate charge than Li-ion does. The result is a cell that charges quickly, reads full, and then drains within minutes of use. Going forward, charge the replacement pack to full, then remove it from the base and store the robot unplugged until the next use.

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