iRobot Braava 380 Replacement Battery 7.2V 1500mAh GPRHC202N026

iRobot Braava 380 Series — 7.2V Ni-MH Replacement Battery (GPRHC202N026)

This is a 7.2V, 1500mAh Ni-MH replacement battery for the iRobot Braava 380, 380T, 381, and 5200B hard floor mopping robots. It slots into the battery compartment and restores power to the automated wet and dry mopping cycle. Capacity is rated at 1500mAh (10.8Wh), matching the original specification.

• Braava 380 series compatibility: The 380, 380T, 381, and 5200B all share the same battery bay dimensions and 7.2V power rail. The BMS handshake protocol is identical across these variants, so the same cell works across the group without modification.
• Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on a Braava 380T. The BMS accepted the charge without fault codes, voltage held steady through both wet and dry mopping sequences, and cutoff triggered cleanly at the low-voltage threshold.
• Ni-MH cycle care for mopping robots: The Braava 380 charges the battery inside the unit between sessions. Do not leave the robot plugged in on the charging cradle indefinitely after a full charge — Ni-MH cells develop capacity fade faster under continuous trickle charge than when stored off the charger between uses.

Why the Braava 380 stops mid-cycle before the battery indicator drops to low

Ni-MH cells deliver a relatively flat discharge curve until voltage drops sharply near depletion. The Braava's BMS monitors this voltage curve and cuts power when the cell can no longer sustain the motor load — this can happen abruptly rather than gradually. An aged cell hits this drop-off point much earlier in the cycle because usable capacity has shrunk even though the battery appeared charged. Replacing the cell resets the full discharge range and restores consistent mid-cycle performance.

Braava 380 shows a full charge but stops working after a few passes

This is a classic symptom of capacity fade in a degraded Ni-MH pack — the charger reads voltage as acceptable, but the cell can no longer hold charge across a full work cycle. Internally, individual cells in the pack have lost capacity unevenly, so the pack voltage looks healthy at rest but collapses under load. The fix is replacing the battery, not reconditioning. After fitting the new cell, run a full charge to 7.2V before the first mopping session.