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Asus Transformer TF701T Replacement Battery C12P1305 3.8V

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Fits Asus Transformer TF701T tablet; replaces OEM part C12P1305.
3.8V, 8150mAh lithium-polymer cell delivers the full 30.97Wh capacity the display and WiFi module require under concurrent load.
Connector slides into the internal battery cavity with a two-pin JST interface; locking tab secures flush against the case frame.
We bench-tested this cell in the TF701T dock—fuel gauge accepted the new BMS signature after first insertion, no fault codes logged.
After installation, run one full discharge to automatic shutoff then charge uninterrupted to 100% to reset the fuel gauge IC calibration against the new cell.
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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

3.8V

Amp

8150mAh

Asus Transformer TF701T — 3.8V Li-Polymer Replacement Battery (C12P1305)

This 3.8V, 8150mAh Li-Polymer battery replaces the C12P1305 cell in the Asus Transformer Pad TF701T (K00C). It fits the 10.1-inch Android hybrid tablet directly. Voltage and capacity match the original specification exactly.

  • TF701T and K00C compatibility: Both model designations refer to the same hardware revision. They share the same connector pinout, the same BMS communication line, and the same charge IC on the motherboard. One battery covers both.
  • Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on the TF701T motherboard. The BMS handshake completed on first connection, charge IC accepted the cell without fault codes, and the protection circuit tripped correctly at low-voltage cutoff.
  • Fuel gauge recalibration after swap: The TF701T uses a fuel gauge IC that tracks charge state against the old cell's capacity curve. After fitting this battery, run one full discharge to automatic shutoff, then charge uninterrupted to 100%. This resets the IC against the new cell and clears the inaccurate percentage reading that appears post-installation.

TF701T shutting down at 15–25% battery remaining

The TF701T draws heaviest current when the display backlight is at full brightness and WiFi is actively transferring data. At around 15–25% state of charge, cell voltage drops fast under that combined load. The BMS reads this voltage cliff as a low-voltage condition and triggers an immediate shutdown before the percentage display catches up. Fitting a fresh cell reduces internal resistance, which flattens that voltage sag — but the fuel gauge IC still needs one full calibration cycle to report the correct cutoff point. Run the recalibration discharge described above, and the premature shutdowns stop.

Battery percentage jumping or stuck after replacement

After a cell swap, the fuel gauge IC on the TF701T is still calibrated to the capacity curve of the old, degraded battery. It will report incorrect percentages — often jumping from 40% to 10%, or locking at a fixed number while the tablet continues to run. This is not a fault with the replacement cell. Force the IC to relearn by discharging the tablet completely until it shuts off on its own, then plug in and charge to 100% without interruption. One full cycle is enough to recalibrate the gauge against the new 8150mAh cell.

Compatible Models

Transformer TF701T K00C TF701T

Replaces Part Numbers

C12P1305

Technical Specifications

Voltage3.8V
Amp Hours8150mAh
Capacity8150mAh
Rate30.97Wh
Net Weight131g /4.62 oz
Gross Weight271g /9.56 oz
Approximate Weight271g /9.56 oz
Dimension 197.49 x 90.99 x 3.38 mm

Product Highlights

  • Brand: Asus
  • 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 TF701T shows 100% charge but drops to 20% within the first hour of use — is the new battery faulty?

The cell is almost certainly fine. The fuel gauge IC on the TF701T holds its calibration data from the old, degraded battery, so its percentage readings are unreliable immediately after a swap. Discharge the tablet fully until it shuts off automatically, then charge it uninterrupted to 100%. That single cycle resets the IC against the new 8150mAh capacity curve and the percentage readings stabilise.

Fast charging stopped working after I replaced the battery on my TF701T — the charge rate is much slower than before.

The TF701T's charge IC requires one completed charge cycle before it fully negotiates the charge rate with a new cell. On the first charge after installation, the IC runs the new cell at a conservative current while it verifies cell behaviour. Plug in, let it charge to 100% without interruption, and disconnect. On the second charge cycle, the IC applies the normal charge rate. If the slow rate persists beyond two full cycles, check that the connector is fully seated — a partially connected cell causes the charge IC to throttle current as a fault response.

The TF701T gets noticeably warm near the top edge while charging the new battery — should I be concerned?

Warmth near the top edge is where the charge IC and power management circuitry sit on the TF701T motherboard, not where the battery itself is located. A new Li-Polymer cell draws higher current in the bulk charge phase than a degraded cell did, so the charge IC runs warmer than you may remember. This is normal behaviour during the first several charge cycles. If the tablet becomes hot to the touch or shows a charging error on screen, disconnect immediately and check the connector seating — but mild warmth through normal charging is not a fault condition.

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