About this replacement
Samsung Q40 Pro U1400 Silver — 11.1V Li-ion Replacement Battery (SSB-Q30LS3/C)
This 11.1V, 2200mAh Li-ion battery replaces the original power cell in the Samsung Q40 Pro U1400 Silver and related Q30 series ultrabooks. It fits models using OEM part numbers SSB-Q30LS3/C, SSB-Q30LS3, and SSB-Q30LS3/E. Capacity is 24.42Wh — matching the original specification exactly.
- Q30 and Q40 series compatibility: These models share the same 11.1V three-cell configuration, connector pinout, and BMS communication protocol. That shared platform is why one cell covers the Q40 Pro U1400 Silver, Q30TWM 733, Q30 Silver 1100, Q30 LXC 1100, and over a dozen additional variants without modification.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on a Q30 series unit. The BMS handshake completed on first connection, charge current ramped normally, and the protection circuit responded correctly to over-discharge cutoff without tripping at an unexpected voltage threshold.
- Post-install calibration on Samsung ultrabooks: After fitting this battery, run the laptop down to automatic hibernate cutoff, then charge uninterrupted to 100%. Samsung's BIOS battery learn cycle resets against the new cell during that sequence and clears the false "poor health" flag that commonly appears after any cell swap on this platform.
BIOS reporting poor battery health immediately after replacement
Samsung's BIOS reads health data stored in the battery's EEPROM and compares it against learned charge history from the previous cell. A brand-new cell has no learned history, so the BIOS flags it as degraded or unknown — this is a data mismatch, not a fault with the replacement. Running one complete discharge-to-hibernate followed by a full uninterrupted charge lets the fuel gauge IC write fresh calibration data to EEPROM. After one or two cycles, the BIOS health indicator will update to reflect the actual cell state. No firmware update or BIOS reset is required — calibration cycling resolves it.
Laptop shutting down while the OS still shows 20–30% charge remaining
This symptom points to a voltage cliff — the cell voltage drops sharply under combined CPU and display load before the fuel gauge IC reaches its 0% threshold. The fuel gauge was calibrated against an aged cell that held voltage longer at low capacity, so its percentage readings no longer map accurately to the new cell's discharge curve. The fix is the same calibration cycle: discharge fully to hibernate cutoff, then charge to 100% without interruption. After two or three cycles the fuel gauge IC recalibrates its internal model and the early shutdowns stop.