HP Pavilion dv6 dv7 Replacement Battery 10.8V 6600mAh 484785-001

HP 540 / 541 Series — 10.8V Li-ion Replacement Battery (484785-001)

This 10.8V, 6600mAh Li-ion battery replaces the original cell in HP 540 and 541 notebooks. It also cross-references as HSTNN-DB51, 500014-001, KU530AA, HSTNN-OB51, 456623-001, 451545-361, and 451545-261. If your current battery no longer holds charge or Windows reports degraded health, this is the direct cell swap.

• HP 540 and 541 platform fit: Both notebooks share the same battery bay dimensions, connector pinout, and BMS communication protocol — that is why a single cell covers both models. The 10.8V rail matches the DC-DC converter input on the 540 and 541 motherboard exactly.
• Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on a 540 chassis. The BMS negotiated correctly with the HP EC firmware, charge current tapered properly at the 4.2V-per-cell threshold, and no protection trip occurred under sustained CPU and display load.
• First-cycle calibration on the HP 540: After fitting, run the laptop on battery until Windows triggers hibernate at the low-voltage cutoff — do not interrupt it. Then charge uninterrupted to 100%. This forces the BIOS battery learn cycle to reset against the new cell and clears the inaccurate health warning that appears after every cell swap.

BIOS reporting poor battery health immediately after swapping the 540 cell

The HP 540 BIOS reads health data stored in the battery's EEPROM, not live cell voltage. When you install a new cell, the EEPROM values from the old battery are gone and the firmware flags the health as unknown or poor until it builds new data. This is not a fault with the replacement cell. Run one full discharge-to-hibernate cycle followed by an uninterrupted charge to 100% — the BIOS learn cycle will populate fresh capacity data and the health warning clears on the next boot.

Laptop shuts off at 20–30% battery shown on the HP 540

This is a voltage-cliff problem, not a gauge problem. Under combined CPU and display load, cell voltage drops faster than the fuel gauge IC can recalculate — the system hits the under-voltage protection threshold before the percentage display catches up. It happens most often in the first few cycles before the gauge IC has calibrated against the new cell's actual discharge curve. Run two or three full discharge-to-hibernate cycles and the cut-off point will stabilise. If it persists past three cycles, check the charge adapter is delivering a stable 18.5V under load.