XRobot XR510 Replacement Battery 14.4V 3500mAh Ni-MH

XRobot XR510 — 14.4V Ni-MH Replacement Battery

This is a 14.4V, 3500mAh Ni-MH replacement battery for the XRobot XR510 robotic vacuum cleaner. It slots into the XR510's battery bay and powers the drive motors, brush roll, and suction fan. Capacity is rated at 50.4Wh — matching the original cell specification.

• XR510 platform fit: The XR510 runs a 14.4V Ni-MH pack with a specific cell count and connector orientation. This replacement matches that voltage rail and physical form factor — 90.06 × 69.53 × 45.45mm — so the battery bay closes and contacts seat correctly.
• Bench tested on actual hardware: We ran this pack through charge and discharge cycles on the XR510 platform. The BMS responded normally to the vacuum's charge termination signal, and current draw across the drive motor and suction fan stayed within rated band throughout the cycle.
• Dock charging discipline on the XR510: Remove the XR510 from its charging dock once the charge cycle completes. Robotic vacuums left on continuous dock contact receive a sustained trickle that degrades Ni-MH cells faster than partial-discharge cycling — capacity fade shows up within weeks, not months.

Suction dropping before the battery indicator reaches low on the XR510

The XR510's suction fan motor draws harder when the filter is partially blocked — resistance goes up, current goes up, and the pack voltage sags under the load. A Ni-MH battery with degraded cells hits that voltage sag point earlier in the discharge curve than a fresh pack. The indicator reads charge state, not load-adjusted voltage, so the light still shows adequate charge while suction has already dropped. Clean or replace the filter first, then assess whether the battery itself needs replacing — a blocked filter alone causes this symptom on a good pack.

XR510 motor cutting out mid-cycle then restarting on its own

This is a BMS overcurrent trip, not a flat battery. When the XR510 encounters thick carpet or a partial blockage, the brush roll and suction motor spike current draw simultaneously. If the pack's BMS detects sustained current above its threshold, it opens the circuit — the vacuum goes silent, then resets after a few seconds once the BMS cools and re-closes. The fix is to clear any blockage at the brush roll and confirm the filter is clean before assuming the battery is the cause. A replacement pack will trip the same way if the underlying restriction is still present — check the filter and brush roll first.