Advent 4490 Replacement Battery 11.1V 4400mAh J10-3S2200

Advent 4490 / 4214 Series — 11.1V Li-ion Replacement Battery (J10-3S2200-G1B1)

This is an 11.1V 4400mAh (48.84Wh) Li-ion battery for the Advent 4490, 4214ES, and 4214 notebook computers. It replaces OEM part numbers in the J10-3S2200 and J10-3S4400 families, which share the same connector, cell configuration, and BMS protocol across these models. Capacity figure is taken from the product data — not web search estimates.

• 4490, 4214ES, and 4214 compatibility: These three models share the same 3S2 cell arrangement and connector pinout. The BMS handshake across the series uses the same SMBus address, so the same pack works across all three without hardware modification.
• Bench tested on actual hardware: We ran this pack through charge-discharge cycles on the 4490 platform. The BMS communicated correctly over SMBus, charge termination triggered at the right cut-off voltage, and the protection circuit responded to over-discharge conditions as expected.
• BIOS learn cycle after installation: After fitting this battery, run the laptop down to hibernate cut-off on a single discharge, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap on these models.

Why the Advent 4490 shuts down at 20–30% remaining after a battery swap

The fuel gauge IC in the Advent 4490 stores charge data calibrated to the old cell's specific capacity curve. When a new cell goes in, the IC is still referencing the old discharge profile, so its remaining-charge estimate diverges from reality fast. Under combined CPU and display load, the new cell hits a voltage drop the IC wasn't expecting, and the system interprets it as a critical low-battery event. Running two full discharge-to-hibernate, then charge-to-100% cycles recalibrates the IC against the actual cell and eliminates the premature shutdowns.

BIOS reporting battery as "unknown" or 0% immediately after fitting

This happens when the EEPROM data on the replacement cell doesn't match the Wh or cycle-count values the BIOS cached from the original pack. The BIOS flags the mismatch as an unrecognised battery rather than accepting the new cell's SMBus data. It is not a fault with the battery or the laptop. Power off completely, remove the AC adapter, hold the power button for 15 seconds to drain residual board voltage, then reconnect AC and boot — this forces the BIOS to re-read the SMBus registers from scratch and accept the new cell's reported values.