About this replacement
HP Pavilion tx1080EA Series — 7.2V Li-ion Replacement Battery (441131-001)
This 7.2V, 8800mAh (63.36Wh) Li-ion cell replaces the original battery in the HP Pavilion tx1080EA and the broader tx1200–tx1300 convertible tablet notebook series. It matches the OEM voltage rail and connector pinout used across this platform. Capacity figures come from the product data, not web search.
- tx1000 series platform fit: The tx1080EA, tx1204au, tx1219au, tx1307au, and 260+ related models share the same 7.2V dual-cell architecture, identical connector housing, and BMS communication protocol — which is why one cell works across all of them.
- Bench tested on actual hardware: We ran this cell through full charge and load cycles on a tx-series unit. The BMS handshake completed without fault codes, charge acceptance reached rated capacity, and the protection circuit tripped cleanly at the expected low-voltage threshold under CPU and display load.
- Post-install discharge cycle on the tx1080EA: After fitting this cell, run the laptop on battery until it hibernates, then charge uninterrupted to 100%. The tx-series BIOS uses a battery learn cycle to recalibrate its fuel gauge IC against the new cell — skipping this step leaves the health indicator stuck on the old cell's degraded EEPROM data.
BIOS reporting poor battery health immediately after fitting a new cell
The tx1080EA's BIOS reads health data from EEPROM embedded in the battery's BMS circuit. When you swap cells, the new cell carries its own EEPROM baseline — but the BIOS compares it against the charge history it cached from the old pack. This mismatch triggers a false "degraded" or "poor health" flag. One full discharge-to-hibernate followed by a complete uninterrupted charge resets the learn cycle and clears the warning. If the flag persists after two full cycles, check that the cell voltage at full charge reads 8.3–8.4V at the connector.
Laptop shuts down at 20–30% battery shown on screen
This happens when the fuel gauge IC has not yet calibrated against the new cell's actual discharge curve. The percentage displayed reflects the old cell's voltage-to-capacity mapping, so the system hits the hardware low-voltage cutoff before the gauge reaches 0%. It is not a fault with the replacement cell. Run two full discharge-to-hibernate and full-charge cycles without interruption — after the second cycle, the fuel gauge IC recalibrates and the shutdowns stop. Confirm the cell is holding above 6.8V under load during the second calibration cycle.