About this replacement
Dell Studio XPS 16 — 11.1V Li-ion Replacement Battery (312-0815)
This is an 11.1V, 4400mAh Li-ion replacement battery for the Dell Studio XPS 16, Studio XPS 1640, Studio XPS M1640, and Studio XPS 16 1647. It replaces OEM parts 312-0815, X411C, W303C, U011C, 312-0814, and W298C. If your original battery no longer holds charge or has failed entirely, this cell restores unplugged use to the notebook.
- Studio XPS 16 series fit: The 1640 and 1647 share the same battery bay dimensions, connector pinout, and BMS handshake protocol — one cell covers both board revisions without modification.
- Bench tested on actual hardware: We cycled this cell on a Studio XPS 1640 and confirmed the BMS completed charge handshake, reported state-of-charge correctly to the OS, and held voltage under combined CPU and GPU load without triggering protection cutoff.
- Post-install discharge cycle on the Studio XPS 16: After fitting this cell, run one full discharge to hibernate-cutoff then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap.
BIOS reporting battery health as poor after replacing the cell
The Studio XPS BIOS reads battery health from EEPROM data stored on the battery's fuel gauge IC. When a new cell is installed, that EEPROM carries factory baseline figures — not values calibrated to your specific board. The BIOS compares current state against the old cell's learned data and flags a mismatch as degraded health. Running two full discharge-to-hibernate and uninterrupted charge cycles gives the fuel gauge IC enough data to overwrite those baseline figures with accurate readings.
Laptop shuts down at 20–30% charge shown on the meter
This happens when the fuel gauge IC hasn't yet calibrated against the new cell's actual voltage curve. The OS reads a fuel gauge estimate, not live cell voltage — so the percentage shown can be several points higher than the real remaining capacity. Under full CPU and display load, the cell hits its low-voltage cutoff before the meter reaches zero. Run two complete discharge cycles to calibrate the gauge; after that, shutdowns should align with 5% or below.