HP 2133 Mini-Note 10.8V Replacement Battery 482262-001

HP 2133 Mini-Note — 10.8V Li-ion Replacement Battery (482262-001)

This is a 10.8V, 2600mAh (28.08Wh) Li-ion replacement battery for the HP 2133 Mini-Note subnotebook. It fits the 2133 series including KX868AT, KR939UT variants, and associated SKUs listed under OEM part numbers 482262-001, KU528AA, HSTNN-DB63, HSTNN-IB63, and HSTNN-IB64. It restores battery operation to units where the original cell has degraded or failed entirely.

• 2133 Mini-Note platform fitment: All 2133 Mini-Note variants share the same 10.8V three-cell battery bay, connector pinout, and BMS handshake protocol. The OEM part numbers KU528AA and HSTNN-IB63/IB64 are interchangeable across this platform — the EEPROM signature is identical across units.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a 2133 Mini-Note unit. The BMS handshake completed correctly, charge current stepped down as expected near full capacity, and the protection circuit tripped at the correct low-voltage threshold without requiring a manual reset.
• Post-install calibration on the 2133 Mini-Note: After fitting this cell, run one full discharge to hibernate cutoff, then charge uninterrupted to 100%. The 2133's BIOS battery learn cycle resets on this sequence. Skipping it leaves the fuel gauge IC working against stale EEPROM data from the old cell, which causes inaccurate state-of-charge readings for the first several sessions.

Why the 2133 Mini-Note BIOS reports poor battery health after a cell swap

The HP 2133 stores battery health data in EEPROM on the battery's embedded controller — not in the BIOS itself. When a new cell is installed, the BIOS reads residual health metrics written by the old cell and flags them as degraded. This is not a fault with the replacement cell. Running a full discharge-to-hibernate then an uninterrupted charge to 100% forces the fuel gauge IC to rewrite the EEPROM baseline against the new cell's actual chemistry. After one or two complete cycles, the health warning clears and the reported capacity aligns with the 28.08Wh rating.

HP 2133 Mini-Note shutting down at 20–30% charge shown

This happens when the cell voltage drops below the minimum threshold under combined CPU and display load before the OS fuel gauge reaches zero. The fuel gauge IC is calibrated against a different discharge curve than the new cell delivers, so it reads 20–30% remaining while the actual cell voltage is already at cutoff. It is not a faulty cell — it is a calibration mismatch. Run a full discharge to hibernate and a full uninterrupted charge twice; after those cycles the fuel gauge re-maps to the new cell's voltage curve and the early shutdowns stop.