Dell Latitude XT 11.1V Replacement Battery 451-10498

Dell Latitude XT / XT2 — 11.1V Li-ion Replacement Battery (451-10498)

This 11.1V 3300mAh (36.63Wh) Li-ion battery replaces the original cell in the Dell Latitude XT and XT2 ultraportable notebook. It matches OEM part numbers 451-10498, FW273, 312-0650, PU536, MR369, PU501, and 0PU501. The connector, BMS handshake, and voltage rail are matched to what the Latitude XT platform expects.

• Latitude XT and XT2 compatibility: Both models run the same 11.1V three-cell configuration and use the same SMBus BMS protocol. The connector pinout and charge termination logic are identical across the XT and XT2, so one battery covers both generations.
• Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on the Latitude XT platform. The BMS handshook correctly on first connection, charge termination triggered at the expected 12.6V ceiling, and the OS read capacity without throwing an unknown device error.
• BIOS learn cycle after install: After fitting this battery, run the laptop down to hibernate cutoff 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 Dell notebooks.

BIOS reporting battery health as poor after replacement

Dell's BIOS reads health data from the battery's EEPROM, which stores cycle count and rated capacity from the previous cell. When a new battery arrives, the EEPROM data doesn't yet match the BIOS's learned values, so it flags the cell as degraded. This isn't a fault with the replacement — it's a calibration mismatch. One full discharge-to-hibernate followed by a full uninterrupted charge writes fresh data to the learn cycle and clears the warning.

Latitude XT shutting down at 20–30% charge shown

This happens when the fuel gauge IC hasn't calibrated against the new cell's actual voltage curve. Under full CPU and display load, the cell voltage drops faster than the uncalibrated gauge expects, and the system interprets that voltage cliff as a critical low-battery event. The shutdown is a firmware protection response, not a defective battery. Run two full discharge-to-hibernate and full-recharge cycles — after the second cycle the gauge tracks the real voltage curve and the early shutdowns stop.