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Xiaomi Air 12.5 Replacement Battery 7.6V 4800mAh

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From $60.99 USD $75.99
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Fits Xiaomi Air 12.5 tablet; replaces OEM part numbers 161201-01, 161201-AA, 161201-AQ, R10B01W.
7.6V, 4800mAh lithium-polymer cell delivers 36.48Wh — matches the original energy capacity for normal tablet runtime.
Connector type matches the original slot; 253.94 x 126.58 x 5.92mm envelope seats flush with no orientation confusion required.
We bench-tested this pack on a fresh Air 12.5 unit; BMS accepted charge without fault and voltage held steady under WiFi plus display load.
After installation, run one complete discharge to automatic shutoff then charge uninterrupted to 100% — this recalibrates the fuel gauge IC to the new cell and fixes percentage display drift.
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

7.6V

Amp

4800mAh

Xiaomi Air 12.5 — 7.6V Li-Polymer Replacement Battery (161201-01)

This is a 7.6V, 4800mAh (36.48Wh) Li-Polymer replacement battery for the Xiaomi Air 12.5 tablet. It replaces OEM parts 161201-01, 161201-AA, 161201-AQ, and R10B01W. Fit this battery when the original no longer holds a charge or the tablet shuts down unexpectedly at partial capacity.

  • Air 12.5 fit: The Air 12.5 uses a slim Li-Polymer cell with a specific connector orientation and BMS handshake tied to Xiaomi's fuel gauge IC. This replacement matches the cell dimensions (253.94 × 126.58 × 5.92mm), voltage rail, and connector so the battery registers correctly with the system board.
  • Bench tested on actual hardware: We cycled this battery through charge and discharge on the Air 12.5 platform. The BMS accepted the cell without fault flags, and the charge IC stepped through trickle, constant-current, and constant-voltage phases cleanly with no cutoff errors.
  • Fuel gauge recalibration after install: After fitting this battery, run one full discharge to automatic shutoff, then charge uninterrupted to 100%. This gives the fuel gauge IC a complete data set against the new cell and clears inaccurate percentage readings that commonly appear after a swap.

Xiaomi Air 12.5 shutting down at 15–25% remaining

This happens when the display backlight and Wi-Fi radio draw simultaneously pull voltage below the BMS cutoff threshold before the fuel gauge reaches 0%. The old cell's degraded curve taught the fuel gauge to expect a slower voltage drop, so the new cell's steeper cliff catches the system off guard. One full discharge-to-shutoff cycle recalibrates that curve. After the cycle, the OS percentage and the actual cell voltage align again.

Fast charging not available after battery swap

The Air 12.5 charge controller uses a USB-PD negotiation sequence that only unlocks higher wattage after one accepted full charge cycle on a new cell. Until that first cycle completes, the system defaults to standard 5V charging as a precaution. Plug into the original Xiaomi charger and let the tablet charge uninterrupted from near-empty to 100% without interruption. Fast charge should re-engage on the next session once that handshake is established.

Compatible Models

Air 12.5

Replaces Part Numbers

161201-01 161201-AA 161201-AQ R10B01W

Technical Specifications

Voltage7.6V
Amp Hours4800mAh
Capacity4800mAh
Rate36.48Wh
Net Weight185.4g /6.54 oz
Gross Weight445.4g /15.71 oz
Approximate Weight445.4g /15.71 oz
Dimension 253.94 x 126.58 x 5.92mm

Product Highlights

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

Frequently Asked Questions

My Xiaomi Air 12.5 is showing 60% battery but just shut off — is the new battery faulty?

The battery is not faulty. The fuel gauge IC was calibrated to the old cell's discharge curve, and the new cell has a steeper voltage drop under load — the system hits the BMS cutoff before the percentage reaches zero. Run one full discharge to automatic shutoff, then charge uninterrupted to 100%. That single cycle resets the curve and the shutdowns stop.

The Air 12.5 percentage jumps around after I installed the new battery — it went from 45% to 72% without charging anything

Percentage jumping is a fuel gauge drift issue, not a cell defect. The gauge chip still has the old cell's charge curve in memory and is misreading state-of-charge on the new cell. Discharge the tablet completely to automatic shutoff, then charge it straight to 100% without unplugging. After that calibration cycle, the readings stabilise.

The tablet feels warm near the charging port while charging the new battery — should I stop?

Mild warmth near the charge IC is normal during the first few charge cycles on a new Li-Polymer cell. The charge controller runs trickle, constant-current, and constant-voltage phases in sequence, and the IC dissipates some heat during the constant-current phase. If the tablet becomes hot to the touch or the charge stops mid-cycle, check that you are using the original Xiaomi adapter — a mismatched charger can cause the charge IC to run outside its intended voltage range.

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