Dell Precision M3800 Replacement Battery 11.1V 5400mAh TOTRM

Dell Precision M3800 / XPS 15 9530 — 11.1V Li-Polymer Replacement Battery (TOTRM)

This is an 11.1V 5400mAh (59.94Wh) Li-Polymer replacement battery for the Dell Precision M3800 and XPS 15 9530. It also fits the XPS 15D-9728T, XPS 15D-2828, and related models. OEM part numbers covered include TOTRM, H76MV, T0TRM, 7D1WJ, Y758W, and 451-BBEK.

• Precision M3800 and XPS 15 9530 platform: Both machines share the same 11.1V battery rail, connector pinout, and BMS handshake protocol. One cell fits both because Dell used the same battery management architecture across this mobile workstation and consumer ultrabook chassis generation.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the Precision M3800. The BMS communicated correctly with the Dell EC, reported accurate state-of-charge, and held voltage through sustained CPU and GPU load without triggering low-voltage cutoff.
• First-use calibration on Dell hardware: After fitting this cell, run the laptop on battery until it hibernates at cutoff, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after any cell swap on Dell systems.

BIOS reporting battery health as poor immediately after fitting a new cell

Dell's BIOS reads health data from the battery's EEPROM, which carries charge cycle count and capacity history from the previous cell. A brand-new replacement will sometimes show degraded health on first boot because the EEPROM data hasn't been reset against the new chemistry. This is a firmware reporting issue, not a fault in the cell. Run one full discharge-to-hibernate cycle followed by a full uninterrupted charge to 100% — the BIOS battery learn cycle will re-baseline its health calculation against the actual new cell capacity.

Laptop shuts down at 20–30% shown on the fuel gauge

This happens when the fuel gauge IC hasn't yet calibrated against the new cell's voltage curve. During heavy CPU and display load, the cell voltage drops faster than the uncalibrated gauge expects, and the system hits the low-voltage protection cutoff while the OS still shows 20–30% remaining. It's not a defective cell — it's a calibration lag. Run two to three full discharge-to-hibernate then full-charge cycles without interruption, and the gauge will align to the actual voltage floor of the new cell, which sits at approximately 9.0V under full load.