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Asus Eee Transformer TF101 CMOS Battery 3V 40mAh 110410

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From $26.99 USD $32.99
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Fits Asus Eee Transformer TF101 tablet, replacing OEM part numbers 110410, 0623.11, and 1226.11.
3V, 40mAh lithium coin cell maintains BIOS settings, RTC clock, and system date when mains power is removed.
Coin cell installs flat into the motherboard socket with polarity marked; spring contact must be clean and undamaged for secure fit.
We bench-tested this cell on a TF101 motherboard — the RTC circuit accepted the new 3V source and held clock data through power cycles.
After installation, enter BIOS setup and reset the date and time manually, then save and exit — the CMOS cell powers the RTC circuit only, not the entire system.
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Voltage

3V

Amp

40mAh

Asus Eee Transformer TF101 — 3V Lithium Replacement Battery (110410)

This 3V, 40mAh lithium cell is the CMOS backup battery for the Asus Eee Transformer TF101 and Eee Pad Transformer series tablets. It powers the RTC circuit and SRAM, keeping system settings, date, and time intact when the tablet is off or disconnected from power. When this cell drops below retention voltage, the tablet loses its clock and configuration on every power cycle.

  • TF101 and Eee Pad Transformer series fit: These models share the same motherboard RTC circuit and connector layout. The cell uses OEM part numbers 110410, 0623.11, and 1226.11 across production runs — the electrical spec is identical across all variants.
  • Bench tested on actual hardware: We confirmed the cell holds 3V open-circuit and that the RTC circuit latched correctly after installation. The SRAM retained settings through a full mains-disconnect cycle with no checksum errors.
  • Post-installation RTC correction: After swapping the cell, enter the tablet's system settings and manually set the correct date and time, then save. The CMOS cell powers the RTC circuit, and any interruption during the swap resets the clock to a default value — this step is required to resync the system clock correctly.

BIOS clock resetting to a default date after every power cycle

The RTC circuit on the TF101 motherboard relies on this lithium cell to maintain clock state when main power is absent. Once the cell drops below approximately 2.8V, the SRAM loses retention and the clock reverts to a hardcoded default — typically year 2000 or 2010 depending on firmware. This happens consistently on every cold boot, not intermittently. Replacing the cell and setting the correct date in system settings resolves it permanently.

CMOS checksum error on boot after fitting a new cell

A checksum error after installing a new coin cell usually means the SRAM was completely cleared before the swap — not a fault with the new cell. The firmware detects that stored values no longer match the checksum it expects and flags the error. Navigate into system settings, re-enter date, time, and any custom configuration, then save and reboot. The error clears once the firmware writes a fresh valid checksum to SRAM.

Compatible Models

Eee Transformer TF101 Eee Pad Transformer TR101 prefix Eee Pad Transformer TF101 prefix Mobile Docking Eee Pad Transformer TF101 TF101-X1 16GB Eee Pad Transformer TF101X1 16GB Eee Pad Transformer TF101-1B001A Eee Pad Transformer TF1011B001A Eee Pad Transformer TF101-1B002A Eee Pad Transformer TF1011B002A Eee Pad Transformer TF101-1B003A Eee Pad Transformer TF1011B003A Eee Pad Transformer TF101-1B004A Eee Pad Transformer TF1011B004A Eee Pad Transformer TF101-1B006A Eee Pad Transformer TF1011B006A Eee Pad Transformer TF101-1B011A Eee Pad Transformer TF1011B011A Eee Pad Transformer TF101-1B012A Eee Pad Transformer TF1011B012A Eee Pad Transformer TF101-1B017A Eee Pad Transformer TF1011B017A Eee Pad Transformer TF101-1B023A Eee Pad Transformer TF1011B023A Eee Pad Transformer TF101-1B025A Eee Pad Transformer TF1011B025A Eee Pad Transformer TF101-1B026A Eee Pad Transformer TF1011B026A Eee Pad Transformer TF101-1B027A Eee Pad Transformer TF1011B027A Eee Pad Transformer TF101-1B028A Eee Pad Transformer TF1011B028A Eee Pad Transformer TF101-1b029A Eee Pad Transformer TF1011b029A Eee Pad Transformer TF101-1B030A Eee Pad Transformer TF1011B030A Eee Pad Transformer TF101-1B031A Eee Pad Transformer TF1011B031A Eee Pad Transformer TF101-1B033A Eee Pad Transformer TF1011B033A Eee Pad Transformer TF101-1B046A Eee Pad Transformer TF1011B046A Eee Pad Transformer TF101-1B047A Eee Pad Transformer TF1011B047A Eee Pad Transformer TF101-1B048A Eee Pad Transformer TF1011B048A Eee Pad Transformer TF101-1B050A Eee Pad Transformer TF1011B050A Eee Pad Transformer TF101-1B090A Eee Pad Transformer TF1011B090A Eee Pad Transformer TF101-1B097A Eee Pad Transformer TF1011B097A Eee Pad Transformer TF101-1B100A Eee Pad Transformer TF1011B100A Eee Pad Transformer TF101-1B118A Eee Pad Transformer TF1011B118A Eee Pad Transformer TF101-1B135A Eee Pad Transformer TF1011B135A Eee Pad Transformer TF101-1B141A Eee Pad Transformer TF1011B141A Eee Pad Transformer TF101-1B179A Eee Pad Transformer TF1011B179A Eee Pad Transformer TF101-1B180A Eee Pad Transformer TF1011B180A Eee Pad Transformer TF101-1B185A Eee Pad Transformer TF1011B185A Eee Pad Transformer TF101-1B186A Eee Pad Transformer TF1011B186A Eee Pad Transformer TF101-1B221A Eee Pad Transformer TF1011B221A Eee Pad Transformer TF101G-1B034A Eee Pad Transformer TF101G1B034A Eee Pad Transformer TF101G-1B047A Eee Pad Transformer TF101G1B047A Eee Pad Transformer TF101G-1B046A Eee Pad Transformer TF101G1B046A Eee Pad Transformer TF101G-1B048A Eee Pad Transformer TF101G1B048A Eee Pad Transformer TF101G-1B050A Eee Pad Transformer TF101G1B050A Eee Pad Transformer TF101G-1B060A Eee Pad Transformer TF101G1B060A Eee Pad Transformer TF101G-1B115A Eee Pad Transformer TF101G1B115A Eee Pad Transformer TF101-B1 Eee Pad Transformer TF101B1 Eee Pad Transformer TF101-X1 Eee Pad Transformer TF101X1 Transformer TF101-A1 Transformer TF101A1 Transformer Prime TF201-B1-CG Transformer Prime TF201-B1-GR Transformer Prime TF201-C1-CG Transformer Prime TF201-C1-GR Transformer Prime TF201 Transformer Prime TF201-1I014A TF201-1B002A TF201-1B04 TF201-1B047A TF201-1B087A TF201-1B088A TF201-1I020A TF201-1I046A TF201-1I076A TF201-1I086A TF201-1I102A TF201-1I103A TF201-1I104A TF201G-1I015A

Replaces Part Numbers

110410 0623.11 1226.11

Technical Specifications

Voltage3V
Amp Hours40mAh
Capacity40mAh
Rate0.12Wh
Net Weight1g /0.04 oz
Gross Weight51g /1.80 oz
Approximate Weight51g /1.80 oz
Dimension 21.10 x 12.70 x 2.42 mm

Product Highlights

  • Brand: Asus
  • Manufacturer: CS
  • Series: Standard
  • Color: Green
  • Product Type: Lithium
  • Battery Type: Lithium
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

The TF101 keeps resetting its clock to 2010 every time I unplug it — even with a new battery fitted. What's wrong?

If the clock resets on every mains disconnect, the new cell may not be making solid contact with the retention circuit. Check that the cell is fully seated and the contact spring isn't flattened or oxidised from the old depleted cell. A functioning cell holds the RTC above 2.8V during power-off — below that threshold, the clock defaults regardless of what was saved. Re-seat the cell, set the correct date and time in system settings, then disconnect power again to confirm the clock holds.

Got a CMOS checksum error on boot right after replacing the backup battery on my TF101 — is the new cell faulty?

The new cell is almost certainly fine. A checksum error after a swap means the SRAM was fully cleared before the new cell was installed — the firmware found no valid data and flagged it. Re-enter the date, time, and any system settings, then save and reboot. The error won't return once the firmware writes a fresh valid checksum to SRAM backed by the new cell.

My new coin cell is reading below 3V on a multimeter straight out of the packaging — should I return it?

No — lithium coin cells ship at storage voltage, which can read anywhere from 2.85V to 2.95V before load. Once installed and drawing the microamp-level current of the RTC circuit, the cell stabilises at 3.0V within a short period. The retention threshold for the TF101's CMOS circuit is approximately 2.8V, so a cell reading 2.9V on the bench is still well within spec. Install it, set the date and time, and verify the clock holds after a full power disconnect.

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