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iRobot Braava Jet 240 Replacement Battery 3.6V 2900mAh

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From $38.99 USD $47.99
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Fits iRobot Braava Jet 240, 241, 244, 245 and replaces OEM part number 4446040.
3.6V 2900mAh Li-ion cell restores full cleaning cycles on hard-floor models without voltage sag.
Connector slides into the battery slot with locking tab; orientation is keyed and cannot reverse.
We bench-tested this cell in a Braava Jet 240 — BMS accepted handshake on first insertion, charge curve stable, no fault codes.
Do not leave this battery on the dock continuously after a full charge — trickle-charge cycles degrade capacity faster than removing and storing the pack full.
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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.

Delivery and Shipping

🔹 Most orders ship the next day, and we use FedEx, UPS, Purolator and other carriers to get them to you. Lithium batteries have to ship by ground only, not air or USPS. Make sure your address is right before you order, because if we have to send it back, you pay for shipping again.

Disclaimer

⚠️ Disclaimer: All product names, trademarks, and registered trademarks belong to their respective owners.

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

Voltage

3.6V

Amp

2900mAh

iRobot Braava Jet 240 Series — 3.6V Li-ion Replacement Battery (4446040)

This 3.6V, 2900mAh Li-ion battery replaces part number 4446040 in the iRobot Braava Jet 240, 241, 244, and 245 floor mopping robots. It fits the same connector and BMS interface as the original cell. Capacity is rated at 10.44Wh, matching the stock specification from the factory.

  • Braava Jet 240 series compatibility: The 240, 241, 244, and 245 share the same battery bay geometry, connector pinout, and BMS handshake protocol. A single cell covers all four variants without modification.
  • Bench tested on actual hardware: We cycled this battery through the Braava Jet 240's standard wet-mopping sequence. The BMS held stable voltage across both spray-and-scrub and dry-sweep modes, with no mid-cycle cutoff detected.
  • Avoid leaving the Braava Jet 240 on its charging pad indefinitely: This robot uses a trickle-hold charge once full. Extended dock time at 100% accelerates Li-ion cell degradation — charge the unit, then remove it from the pad once the indicator confirms full charge.

Why the Braava Jet 240 stops mid-clean without a low-battery warning

The Braava Jet 240's BMS monitors cell voltage in real time. When an aging cell drops voltage faster than the indicator circuit can update, the robot shuts down before the low-battery LED triggers. This is a BMS protection event, not a sensor fault. A degraded cell can read 30–40% capacity on the indicator yet collapse under the spray-pump and drive-motor load simultaneously. Replacing the cell resolves the mismatch between reported and actual state of charge.

Braava Jet 240 not responding to charger after long storage

Li-ion cells left discharged for extended periods drop below the BMS recovery threshold — typically around 2.5V per cell. At that voltage, the protection circuit locks out charging as a safety measure. Some chargers will not attempt a recovery charge and simply show no activity. To attempt recovery, connect the robot to the official charger and leave it for 30–60 minutes without interruption — some BMS units will trickle-wake from a near-zero state. If the charger still shows no response after that window, the original cell is beyond recovery and replacement is the correct next step.

Compatible Models

Braava Jet 240 Braava Jet 241 Braava Jet 244 Braava Jet 245 Braava Jet Mopping Robot

Replaces Part Numbers

4446040 BC674

Technical Specifications

Voltage3.6V
Amp Hours2900mAh
Capacity2900mAh
Rate10.44Wh
Net Weight82g /2.89 oz
Gross Weight152g /5.36 oz
Approximate Weight152g /5.36 oz
Dimension 82.70 x 38.00 x 43.00mm

Product Highlights

  • Brand: iRobot
  • Manufacturer: CS
  • Series: Standard
  • Color: Blue
  • Product Type: Li-ion
  • Battery Type: Li-ion
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

My Braava Jet 240 shuts off partway through a mopping cycle even though the battery indicator still shows charge — what's happening?

This is a voltage-collapse issue, not an indicator fault. As Li-ion cells age, internal resistance rises — when the spray pump and drive motors pull current simultaneously, the cell voltage drops sharply below the BMS cutoff threshold even if the indicator still reads partial charge. The indicator reads resting voltage, not load voltage, so the gap between the two widens as the cell degrades. Replacing the battery resolves this; a healthy cell should hold above 3.2V under normal mopping load.

The Braava Jet 240 seems to clean for noticeably less time than it used to — could the charging pad be the cause?

Continuous dock charging is a common cause of capacity fade in this robot. The Braava Jet 240's charger switches to trickle-hold once the cell reaches full charge, and leaving it in that state for days or weeks at a time degrades Li-ion cell capacity faster than regular charge-and-discharge cycles. The fix going forward is to charge the unit fully, then remove it from the pad and store it off-dock. If capacity has already dropped significantly, a replacement cell restores the original charge-holding capability.

My replacement battery for the Braava Jet 240 is installed correctly but the robot won't start — the charger shows it's full, but pressing the button does nothing.

The Braava Jet 240's control board expects a BMS handshake before enabling the drive system. If the replacement cell's BMS doesn't complete that handshake — often caused by a deeply discharged cell on arrival — the board stays locked even if the charger light shows green. Leave the robot on the charger for a full uninterrupted hour, then press and hold the clean button for five seconds. If it still doesn't respond, check that the battery connector is fully seated; a partial connection can pass enough current to satisfy the charger but not the motor controller.

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