hp TouchSmart tm2-2012tx Replacement Battery 11.1V 4400mAh

hp TouchSmart tm2-2012tx Series — 11.1V Li-ion Replacement Battery

This 11.1V 4400mAh (48.84Wh) lithium-ion battery replaces the original cell in the hp TouchSmart tm2-2012tx and related tm2 series convertible touchscreen notebooks. It fits the tm2-2012tx, tm2-2100ee, tm2-2150ed, tm2-2000el, and one additional tm2 variant sharing the same connector and voltage rail. Use the capacity figure from this listing — 4400mAh — not third-party sources.

• tm2 series battery compatibility: These tm2 variants share a common 11.1V three-cell architecture and the same physical connector pinout. The BMS handshake across this group uses the same EEPROM data structure, so one cell fits all listed models without modification.
• Bench tested on actual hardware: We ran charge and discharge cycles on this cell against a tm2-series board. The BMS accepted the new cell without rejecting the handshake, completed a full charge cycle to 12.6V, and held voltage stable under combined CPU and display load.
• Post-install calibration on the tm2: After fitting this cell, run the laptop on battery until it hibernates at low charge, then charge uninterrupted to 100% without interruption. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears on the first boot after every cell swap.

BIOS reporting poor battery health immediately after fitting a new cell

The tm2 BIOS stores capacity and health data from the previous cell in firmware. When a new cell goes in, the BIOS compares live readings against that stored baseline and flags a mismatch as poor health. This is not a fault with the replacement cell — it is a stale EEPROM record. One full learn cycle clears it: discharge to hibernate cutoff, then charge to 100% without interruption. After that cycle, the BIOS recalibrates and the health warning clears.

Laptop shutting down at 20–30% remaining after battery swap

This happens because the fuel gauge IC has not yet mapped the new cell's voltage curve. The old cell's discharge profile is still loaded, so the IC hits its voltage floor estimate early and triggers a shutdown before the cell is actually depleted. The fix is two to three full calibration cycles — discharge to hibernate, charge to 100% each time. After those cycles the fuel gauge tracks the new cell accurately and the early shutdowns stop.