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Asus Transformer Book T100 Replacement Battery C12N1320 3.8V

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From $46.99 USD $57.99
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Fits Asus Transformer Book T100, T100T, T100TA tablet; replaces OEM part C12N1320, 0B200-00720300, 0B200-00720100, 0B200-00720400.
Voltage 3.8V, capacity 8150mAh Li-Polymer; delivers 30.97Wh to restore full tablet runtime on WiFi and standby.
Connector seats flush into the tablet's internal battery slot with standard polarity; no locking tab present on this form factor.
We charged the cell in an Asus dock charger and monitored BMS response; voltage climbed steady to 4.2V with no fault codes.
After installation, run one full discharge to automatic shutoff then charge uninterrupted to 100% — this resets the fuel gauge IC calibration against the new cell and resolves inaccurate percentage display that appears after a swap.
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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 Book T100 Series — 3.8V Li-Polymer Replacement Battery (C12N1320)

This is a 3.8V, 8150mAh (30.97Wh) Li-Polymer battery for the tablet portion of the Asus Transformer Book T100 series. It fits the T100, T100T, and T100TA — the 10-inch detachable tablet that pairs with a keyboard dock. When the original cell degrades and the tablet stops holding charge, this swap restores it to a working state.

  • T100 series tablet bay fitment: The T100, T100T, and T100TA all use the same tablet chassis with the same connector position and BMS handshake protocol. OEM part numbers C12N1320, 0B200-00720300, 0B200-00720100, and 0B200-00720400 all cross-reference to this cell configuration.
  • Bench tested on actual hardware: We ran this battery through charge and discharge cycles on T100TA hardware. The BMS accepted the cell, charge IC negotiated correctly, and the fuel gauge reported voltage without fault flags during the test cycle.
  • Post-swap fuel gauge reset: After installing this battery, run the tablet down to automatic shutoff — do not force it off — then charge uninterrupted to 100%. This single full cycle lets the fuel gauge IC recalibrate against the new cell's actual voltage curve.

Tablet showing wrong battery percentage after battery swap

The T100's fuel gauge IC learns the charge curve of the cell it was calibrated against. Swap the physical cell without recalibrating and the IC keeps reading against the old cell's profile. This causes the percentage display to jump, stall, or report full charge at a lower actual voltage. One complete discharge-to-shutoff followed by an uninterrupted charge to 100% resets the calibration reference and corrects the display.

T100 tablet shutting down unexpectedly at 15–25% remaining

The display backlight and active WiFi together pull a combined load that causes a brief voltage sag on a partially discharged cell. If the BMS detects the cell voltage drop below its cutoff threshold during that sag — even momentarily — it trips and shuts the tablet down before the percentage gauge reaches zero. This is not a defective battery; it reflects a miscalibrated fuel gauge reading the state of charge too optimistically. Run one full discharge cycle and confirm the cell rests above 3.6V at the 20% mark after recalibration.

Compatible Models

Transformer Book T100 Transformer Book T100T Transformer Book T100TA T100 T100T T100TA Transformer Book T100T Windows tablet Transformer Book T100TAF-DK008B Transformer Book T100TAF-DK025B Transformer Book T100TAM-DK014B Transformer Book T100TAM-DK026B Transformer Book T100TAF-DK006B Transformer Book T100TA-DK005PA Transformer Book T100TAF-DK024B Transformer Book T100TA-DK007PA Transformer Book T100TAM-DK013B Transformer Book T100TAM-DK016B Transformer Book T100TAF-DK001B Transformer Book T100TAM-DK564S Transformer Book T100TA-DK007H Transformer Book T100TA-DK026H Transformer Book T100TA-DK053H Transformer Book T100TA-DK003P Transformer Book T100TA-DK048H Transformer Book T100TA-DK003H Transformer Book T100TA3740 Transformer Book T100TA-DK005H Transformer Book T100TA3735 Transformer Book T100TA-DK002H Transformer Book T100TC Transformer Book T101TA T100T TABLET Transformer Book T100TAF Transformer Book T100TAM

Replaces Part Numbers

C12N1320 0B200-00720300 0B200-00720100 0B200-00720400

Technical Specifications

Voltage3.8V
Amp Hours8150mAh
Capacity8150mAh
Rate30.97Wh
Net Weight115g /4.06 oz
Gross Weight255g /8.99 oz
Approximate Weight255g /8.99 oz
Dimension 180.80 x 96.00 x 3.00mm

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 T100 tablet says 100% charged but dies within an hour — is the new battery faulty?

Almost certainly not. The fuel gauge IC on the T100 is calibrated to the old cell's voltage curve, so it reads the new cell inaccurately from the start. Run the tablet down to automatic shutoff without plugging in, then charge it uninterrupted to 100%. After that single cycle, the IC recalibrates against the new cell and the reported percentage aligns with actual capacity.

Fast charging stopped working after I replaced the battery on my T100 — what happened?

The T100's charge IC needs one completed charge cycle to fully negotiate with a new cell before it allows higher charge rates. On the first charge after a swap, the IC defaults to a conservative rate as a precaution. Plug in, let it charge fully to 100% without interruption, then unplug and repeat — most users see the normal charge rate return on the second cycle. If it does not, confirm you are using the original Asus charger, as third-party adapters can prevent the charge IC from stepping up the rate.

The T100 tablet feels warm while charging after the battery swap — should I be concerned?

Mild warmth during the first few charge cycles after a swap is normal. The charge IC runs a conditioning pass on a new cell, which generates slightly more heat than steady-state charging. If the tablet becomes hot to the touch or the heat persists beyond the first two or three charges, check that the replacement part number matches C12N1320 and that nothing is obstructing the back of the tablet during charging. Surface temperature should normalise to pre-swap levels once the cell is broken in.

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