Dell Precision 15 3560 F3T9T Replacement Battery 15.2V 4100mAh

Dell Precision 15 3560 F3T9T — 15.2V Li-Polymer Replacement Battery (075X16)

This 15.2V, 4100mAh (62.32Wh) lithium-polymer battery replaces the original cell in the Dell Precision 15 3560 mobile workstation. It also fits the Latitude 14 5420 and several other Dell platforms sharing the same connector and BMS handshake. OEM part numbers 075X16 and RJ40G both cross-reference to this cell.

• Precision 15 3560 and Latitude 14 5420 platform fit: Both lines share the same 15.2V four-cell Li-Polymer architecture, identical 5-pin SMBus connector, and the same BMS authentication sequence — so one cell covers the full cluster without modification.
• Bench tested on actual hardware: We cycled this cell through charge, full discharge to BMS cutoff, and back to 100% on a Precision 15 3560. The BMS negotiated correctly on first contact, and the fuel gauge IC locked in after two complete cycles with no voltage deviation at the connector.
• Post-swap BIOS learn cycle: After fitting this battery, run a single full discharge until the laptop hibernates on its own, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the false "battery health poor" warning that appears after every cell replacement — it is a calibration flag, not a fault.

BIOS reporting battery health as poor immediately after replacement

Dell's BIOS reads health data from the EEPROM embedded in the battery's BMS, not from live cell voltage. When a new cell arrives, the EEPROM ships with factory-default charge cycle data that the BIOS flags as degraded relative to its expected baseline. This is not a fault with the replacement cell — it is a mismatch between stored EEPROM state and the BIOS learn table. Run one full discharge to hibernate cutoff, then a full uninterrupted charge to 100%. After that cycle, the BIOS recalculates and clears the warning.

Laptop shutting down at 20–30% charge shown on screen

This happens when the fuel gauge IC has not yet calibrated against the new cell's actual discharge curve. The OS is reading a predicted state-of-charge based on the old cell's profile, so the percentage shown is ahead of where the new cell actually sits under load. When the Precision fires up both the CPU and display at full draw, voltage drops faster than the uncalibrated gauge predicts — and the BMS cuts power before the screen reads zero. Two full discharge-to-hibernate cycles recalibrate the gauge IC; after that, the cutoff should align within 5% of the displayed value.