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Mijia 2C Cordless Vacuum Replacement Battery 14.4V 3200mAh

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From $49.99 USD $61.99
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Fits Xiaomi Mijia 2C vacuum cleaners, replaces OEM part P2051-4S1P-ZM.
This 14.4V 3200mAh lithium-ion pack delivers 46.08Wh to the motor assembly without voltage sag.
Connector slides into the battery slot with a single locking tab on the left side.
We bench-tested the BMS under sustained motor draw — no early cutoff, voltage held stable throughout discharge.
Do not leave this pack on the charging dock after reaching full charge — continuous trickle charging 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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By continuing with your purchase, you acknowledge and agree to the estimated 7–10 business day delivery timeframe.
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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.

Disclaimer

⚠️ 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

3200mAh

Mijia STYTJ04ZHM (2C) — 14.4V Li-ion Replacement Battery (P2051-4S1P-ZM)

This 14.4V 3200mAh Li-ion battery pack is a direct replacement for the Mijia 2C cordless stick vacuum (STYTJ04ZHM). It replaces OEM part P2051-4S1P-ZM and fits the Sweeping Vacuum Cleaner 2C platform. Capacity is rated at 46.08Wh — matched to the original specification.

  • 2C platform compatibility: The STYTJ04ZHM and Sweeping Vacuum Cleaner 2C share the same 14.4V four-cell series configuration and battery bay connector. The BMS communicates charge state to the vacuum's LED indicator, so the indicator reads accurately with this pack.
  • Bench tested on actual hardware: We ran this pack through charge and discharge cycles on the 2C motor platform. The BMS held overcurrent protection correctly under simulated blockage loads and allowed full recharge without faulting.
  • Dock charging habit on the Mijia 2C: Do not leave the vacuum sitting on the charging dock continuously. The 2C trickle-charges when docked and full — this accelerates capacity fade in Li-ion cells over weeks of standby. Charge to full, then remove from the dock.

Suction dropping before the battery indicator reaches low on the 2C

The Mijia 2C motor draws significantly more current when the filter is partially blocked — the cells sag under load even when charge level reads normal. At elevated draw, cell voltage can drop below the BMS cutoff threshold before the indicator registers low. Clean the filter first and test again. If suction recovers immediately after a filter clean, the battery is not the cause.

Motor cutting out and then recovering mid-clean

This is a BMS overcurrent trip, not a dead battery. When the vacuum sustains restricted suction — blocked nozzle, clogged filter, or heavy carpet fibres — the motor pulls above rated current long enough to trigger the BMS protection circuit. The pack shuts the output, then recovers once current demand drops. Clear the blockage, then power the vacuum on again. If trips continue on a clean filter with this replacement pack, check that resting pack voltage reads 16.4V or above after a full charge.

Compatible Models

2c STYTJ04ZHM Sweeping Vacuum Cleaner 2C

Replaces Part Numbers

P2051-4S1P-ZM

Technical Specifications

Voltage14.4V
Amp Hours3200mAh
Capacity3200mAh
Rate46.08Wh
Net Weight213g /7.51 oz
Gross Weight363g /12.80 oz
Approximate Weight363g /12.80 oz
Dimension 135.00 x 37.80 x 21.40mm

Product Highlights

  • Brand: Mijia
  • 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 Mijia 2C battery dies way faster than it used to — runtime dropped noticeably over a few months. Is the cell worn out or is something else draining it?

Continuous dock charging is the most common cause on the 2C — the trickle charge cycle slowly degrades Li-ion cells even when the vacuum is not in use. A partially blocked filter is the second cause: restricted airflow forces the motor to draw more current, burning through charge faster on every clean. Remove the filter and wash it before swapping the battery. If runtime recovers after a filter clean, the original cell may still have life left; if not, the replacement pack restores the rated 3200mAh capacity.

The Mijia 2C shows full charge on the indicator but suction drops off heavily within the first few minutes on carpet — what is happening?

Under heavy carpet load the motor current spikes, and an aged or partially degraded cell pack cannot maintain the voltage the motor needs — suction weakens even though charge level still reads high. This is voltage sag under load, not a capacity readout error. Fit the replacement pack and run the vacuum on carpet immediately to confirm the sag is gone. After fitting, a resting voltage of 16.4V on a full charge confirms the new cells are holding correctly.

I fitted the replacement battery but the Mijia 2C will not charge — the indicator does not respond when I put it on the dock.

The 2C charger expects a BMS handshake before it begins charging — if the pack was shipped in deep-discharge protection mode, the charger may not initiate. Connect the dock and leave it for ten to fifteen minutes without touching the vacuum; the BMS on a deeply discharged pack needs a low-current wake pulse before it accepts a full charge cycle. If the indicator still shows nothing, check that the dock connector pins are seating fully against the battery contacts. A successful wake will show the indicator cycling within twenty minutes of first dock contact.

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