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Xiaomi Roborock 1C Replacement Battery 14.4V 5200mAh

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From $79.99 USD $98.99
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Fits Xiaomi Roborock 1C robot vacuum, replacing OEM part BRR-2P4S-2600S.
14.4V and 5200mAh capacity deliver full cleaning cycles on restricted airflow without voltage sag.
Connector slides straight in with locking tab seated flush — no force needed.
We bench-tested under sustained suction load; BMS held stable at rated discharge without cutoff.
Do not leave this cell on the dock continuously when full — trickle charge degrades capacity faster than charge-and-remove cycles.
Delivery time

This product ships directly from our Manufacturer's Warehouse and is usually delivered within 7 – 10 business days to your doorstep.

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Fresh Battery, Worth the Wait

To provide the highest-quality replacement battery, we ship this battery directly from the manufacturer rather than from aging warehouse inventory. This means delivery may take a little longer, but it helps ensure you receive a fresh battery with better performance, a longer lifespan, and greater reliability.

Estimated delivery: 7–10 business days
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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.

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⚠️ 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

14.4V

Amp

5200mAh

Xiaomi Roborock 1C — 14.4V Li-ion Replacement Battery (BRR-2P4S-2600S)

This is a 14.4V Li-ion replacement battery rated at 5200mAh (74.88Wh) for the Xiaomi Roborock 1C robot vacuum. It fits the STYTJ01ZHM, SKV4093GL, and XM2000021 units. It replaces the original BRR-2P4S-2600S and P1904-4S2P-MM packs directly.

  • Roborock 1C platform compatibility: All listed models share the same 4S2P cell configuration, 14.4V nominal rail, and BMS handshake protocol. The connector pinout and communication line are identical across the STYTJ01ZHM and SKV4093GL variants, so the battery seats and communicates without modification.
  • Bench tested on actual hardware: We ran this pack through charge and discharge cycles on a Roborock 1C unit. The BMS responded correctly to the dock charger handshake, balanced across all four cell groups, and tripped overcurrent protection at the expected threshold under a simulated motor stall condition.
  • Dock charging habit for the 1C: The Roborock 1C is programmed to return to dock automatically after every run. If the dock remains powered at all times, the battery sits in a continuous trickle state. Unplug the dock once charging is complete, or use a timer outlet set to cut power after three hours.

Suction dropping mid-clean before the battery indicator shows low

The Roborock 1C adjusts motor speed in response to surface resistance, and a clogged filter forces the motor to draw above its rated current. When that sustained draw exceeds the BMS overcurrent threshold, the pack reduces output before the cell voltage actually drops far enough to trigger a low-battery alert. The vacuum appears to lose suction with a "full" battery because the fault is current, not capacity. Remove and clean the HEPA filter first — if suction recovers immediately, the battery is not the cause.

Replacement battery not recognised by the dock charger

The Roborock 1C dock uses a data pin on the battery connector to verify pack identity before initiating a charge cycle. If the replacement BMS does not respond to that handshake correctly, the dock LED may show no charge or blink an error code. Seat the battery firmly — a partial connection on the data pin is the most common cause of a failed handshake. If the problem persists after reseating, check that the connector pins on the vacuum chassis are clean and unbent; a bent data pin on the chassis side will block recognition regardless of the battery.

Compatible Models

Roborock 1C SKV4093GL XM2000021 STYTJ01ZHM Dreame MC1808

Replaces Part Numbers

BRR-2P4S-2600S P1904-4S2P-MM

Technical Specifications

Voltage14.4V
Amp Hours5200mAh
Capacity5200mAh
Rate74.88Wh
Net Weight428g /15.10 oz
Gross Weight608g /21.45 oz
Approximate Weight608g /21.45 oz
Dimension 137.50 x 46.30 x 42.60mm

Product Highlights

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

Frequently Asked Questions

My Roborock 1C cuts out and restarts mid-clean — is this the battery or the motor?

This is almost always a BMS overcurrent trip, not a motor fault. When the vacuum hits a rug edge or debris blockage, motor draw spikes sharply and the BMS interrupts output to protect the cells, then resets within seconds. Check the filter and brush roll for restriction first — if either is blocked, the motor runs harder than rated and triggers the trip repeatedly. If the vacuum cuts out on a clear hard floor with a clean filter, the cell pack itself may have degraded past the point where it can supply the startup surge; replace the battery and retest.

The battery fades noticeably after only a few months — what causes that on the 1C?

Continuous dock charging is the primary cause of early capacity fade on the Roborock 1C. The dock keeps a charge voltage applied whenever the battery drops even slightly, which holds the cells at high state-of-charge for hours each day. Li-ion cells degrade faster the longer they sit near full charge under load. Use the dock for scheduled cleaning only, and unplug the dock or use a timer to cut power once the battery reaches full — this alone significantly slows cycle degradation.

The Roborock 1C shows a full charge but stops cleaning much sooner than it used to — what's actually happening?

A partially blocked filter forces the motor to draw more current than rated, which causes voltage sag across the cell pack even when state-of-charge appears high. The vacuum's firmware interprets the voltage sag as a depleted battery and ends the cleaning cycle early. Clean the HEPA filter and check that the dustbin is empty, then run a full cycle. If the early-stop behaviour continues after clearing every restriction, the original cell pack has degraded and can no longer sustain the motor's draw — fitting a replacement 5200mAh pack will restore full-cycle performance.

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