About this replacement
iRobot Braava Jet M6 — 10.8V Li-ion Replacement Battery (ALB-C)
This is a 10.8V, 2600mAh Li-ion replacement battery for the iRobot Braava Jet M6 robot mop. It fits models M611020, M612880, and M612680, among others. The battery powers the mop's drive motors and cleaning cycle from the same voltage rail as the original cell.
- M6 series compatibility: The Braava Jet M6 and its regional model variants — M611020, M612880, M612680 — all share the same 10.8V battery architecture and ALB-C form factor. The BMS handshake and connector are identical across this series, so one cell covers all listed models.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the M6 platform. The BMS accepted the replacement without error codes, held voltage through a full cleaning cycle, and the dock charger recognised it normally on the first seating.
- Dock charging behaviour on the M6: The Braava Jet M6 parks on its dock between uses, which means it can stay on continuous trickle charge for days. Li-ion cells degrade faster under prolonged float charge. Remove the mop from the dock once the charge is complete, rather than leaving it docked indefinitely.
Why the Braava Jet M6 stops mid-clean on a new battery
The M6's BMS monitors cell voltage in real time during motor operation. If the drive motors or pump draw more current than the BMS threshold — caused by a partially blocked water nozzle or a dirty tank filter — the BMS will cut power to protect the cell. This can happen even with a fresh battery at full charge. Clear the nozzle and rinse the water filter before attributing a mid-cycle shutoff to the battery itself.
Braava Jet M6 showing "Please charge" immediately after docking
This happens when the dock contacts or the battery terminals have residue from water vapour or cleaning solution — both common in a robot mop environment. The charger cannot complete the BMS handshake through a resistive contact and reports the battery as flat. Wipe the gold dock contacts and the corresponding battery terminals with a dry cloth, then reseat the mop firmly. If the error clears, the cell voltage should read above 10.0V within the first few minutes of charge.