VGP-BPS33 Sony VAIO Fit 14 Compatible Battery 11.1V 3700mAh

Sony SVT-14118CC Series — 11.1V Li-Polymer Replacement Battery (VGP-BPS33)

This 11.1V, 3700mAh Li-Polymer battery replaces the VGP-BPS33 cell in the Sony VAIO Fit 14 lineup. It fits the SVT-14118CC, SVT14118CCS, SVT-1511M1E, and SVT-14 series notebooks. Capacity is 41.07Wh, matching the original specification.

• SVT-14 series compatibility: These models share a common 11.1V three-cell Li-Polymer architecture, the same physical connector pinout, and an identical BMS handshake protocol — which is why one part number covers the full SVT-14 range.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the SVT-14 platform. The BMS handshake completed correctly, the BIOS accepted the cell without flagging an unknown battery, and the charge circuit reached full termination voltage without tripping early cutoff.
• First-cycle calibration on the SVT-14: After fitting the new cell, run one full discharge until the laptop hibernates, then charge uninterrupted to 100%. This forces the BIOS battery learn cycle to reset against the new cell's actual capacity and clears the inaccurate health warning that appears after every cell swap on VAIO firmware.

BIOS reporting poor battery health immediately after fitting the VGP-BPS33

VAIO firmware reads health data from EEPROM metadata left over by the previous cell. When a new cell is installed, that stored data conflicts with the fresh chemistry, so the BIOS flags degraded health before a single cycle has run. The fuel gauge IC has not yet mapped its charge curve against the replacement cell's actual discharge profile. Running the full discharge-to-hibernate then charge-to-100% sequence resets the learn cycle and overwrites the stale EEPROM figures. After one to two full cycles, the health indicator normalises and the reported capacity aligns with 41.07Wh.

Laptop shuts down at 20–30% charge shown on the SVT-14

This happens when the fuel gauge IC is still calibrated to the old cell's voltage-versus-capacity curve. At 20–30% indicated, the new cell's actual voltage under combined CPU and display load drops faster than the uncalibrated gauge predicts, hitting the low-voltage cutoff before the displayed percentage reaches zero. It is a calibration gap, not a fault with the replacement cell. Run two full discharge-to-hibernate cycles with the screen at full brightness and a steady CPU load to force the gauge to re-learn the voltage cliff. After those cycles the shutdown threshold should align with a displayed charge below 5%.