Packard Bell EasyNote TJ61 Compatible Battery 11.1V 4400mAh

Packard Bell EasyNote TJ61 Series — 11.1V Li-ion Replacement Battery (AS09A31)

This 11.1V Li-ion battery replaces OEM part AS09A31 and its cross-reference numbers across the EasyNote TJ61, TJ62, TJ63, and TJ64 series notebooks. Capacity is 4400mAh (48.84Wh). It fits the standard battery bay without modification and connects via the original multi-pin connector.

• TJ61–TJ64 platform fit: These four EasyNote models share the same battery bay dimensions, connector pinout, and BMS communication protocol — which is why a single cell covers all of them. The voltage rail and charge circuit are identical across the range.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a TJ-series unit. The BMS handshake completed correctly, charge termination triggered at the expected voltage, and the protection circuit tripped cleanly under short-circuit test conditions.
• First-cycle recalibration on EasyNote TJ series: After fitting this cell, run one full discharge to hibernate-cutoff, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning the EasyNote BIOS displays after every cell swap.

BIOS reporting poor battery health immediately after fitting a new cell

The EasyNote BIOS reads health data from EEPROM registers on the battery's fuel gauge IC. When a new cell goes in, that EEPROM holds factory default values rather than data calibrated to this specific notebook's charge history. The BIOS interprets that mismatch as degraded health and flags it immediately. Running one full discharge-to-hibernate followed by an uninterrupted full charge gives the fuel gauge IC the data it needs to write accurate state-of-charge values to EEPROM — after which the health warning clears.

EasyNote TJ shutting down at 20–30% charge shown on screen

This is a voltage cliff symptom. Under combined CPU and display load, the cell voltage drops faster than the fuel gauge IC predicted — and when it hits the BMS undervolt cutoff threshold, the laptop shuts off even though the OS is still showing charge remaining. The fuel gauge IC was calibrated to the old cell's discharge curve, not the new one. Run two to three full discharge-to-hibernate cycles and let the IC re-learn the curve against the new cell — the shutdowns will stop once the gauge tracks voltage accurately down to 11.1V nominal cutoff.