Roborock 1C Robot Vacuum Replacement Battery 14.4V 5200mAh

Roborock 1C / Q7 Max Series — 14.4V Li-ion Replacement Battery

This is a 14.4V, 5200mAh (74.88Wh) Li-ion replacement battery for the Roborock 1C robot vacuum and compatible models including the Q7 Max, Q7 Max+, and S5. It fits the internal battery bay and connects to the vacuum's power management board via the original multi-pin connector. Capacity figures come from product data — not inflated web listings.

• 1C, Q7 Max, Q7 Max+ and S5 compatibility: These models share a 14.4V nominal architecture and the same physical bay dimensions. The BMS handshake protocol across this lineup accepts cells at the same charge and discharge thresholds, so one pack covers all listed variants without modification.
• Bench tested on actual hardware: We ran this pack on a 1C chassis and monitored BMS behaviour through full charge and discharge cycles. The protection circuit tripped correctly at low-voltage cutoff and reset cleanly on dock reconnect — no latched faults observed.
• Dock charge discipline for robot vacuums: Roborock robot vacuums left on the dock continuously expose the pack to sustained trickle current. This accelerates capacity fade faster than regular charge-and-remove cycles. Charge to full, then undock the unit if it will sit unused for more than a day or two.

Suction dropping before the battery indicator reaches low

When the filter or brush roll is partially blocked, the motor draws above its rated current to maintain fan speed. The BMS reads this as an overcurrent condition and reduces output voltage to protect the cell. The result looks like a battery problem — suction falls off noticeably — but the indicator may still show two or three bars. Clear the filter and check the brush roll before assuming the pack is at fault. A clean filter brings motor draw back within spec and restores full suction at the same charge level.

Robot vacuum not charging after a replacement battery is fitted

Some Roborock models perform a BMS handshake on dock contact before allowing charge current to flow. If the replacement pack's protection board does not respond within the expected window, the charger holds back and the indicator stays dark. Re-seat the battery connector firmly — a partially seated pin breaks the handshake signal even if the unit powers on. If the problem persists, place the vacuum on the dock, wait 90 seconds, then lift and re-dock. The charger controller retries the handshake on dock re-contact and will typically begin charging at 14.4V input.