About this replacement
Sony VAIO VGN-C15GPB Series — 11.1V Li-ion Replacement Battery (VGP-BPL2)
This is an 11.1V, 8800mAh Li-ion replacement battery for the Sony VAIO VGN-C15GPB and a wide range of VAIO notebooks including the VGN-SZ13C/B, VGN-C50HA/W, and VGN-FE630. It replaces OEM part numbers VGP-BPL2, VGP-BPL2C, VGP-BPS2, VGP-BPS2A, VGP-BPS2B, and VGP-BPS2C. Capacity is 8800mAh (97.68Wh), matching or exceeding original factory specifications.
- VAIO VGN-C, VGN-SZ, and VGN-FE platform fit: These series share the same 11.1V three-cell voltage rail, identical connector pinout, and compatible BMS communication protocol — which is why a single OEM part number covers all of them. The BMS handshake on each model reads cell voltage and thermistor data through the same interface, so no adapter or firmware patch is needed.
- Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on a VAIO-platform notebook. The BMS accepted the new cell without tripping protection, reported state-of-charge correctly through the SMBus interface, and held stable voltage through simulated CPU and display load spikes.
- Post-install calibration on VAIO notebooks: After fitting this battery, run one full discharge to hibernate cutoff, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health or capacity warning that the system logs after any cell swap.
BIOS reporting battery health as poor immediately after installation
Sony VAIO firmware stores battery health data in EEPROM on the old cell. When a new cell is installed, the BIOS compares live readings against that cached data and flags a mismatch as poor health. This is a firmware bookkeeping issue, not a fault with the replacement cell. Running one full discharge-to-hibernate followed by a full uninterrupted charge resets the learn cycle. After two to three complete cycles, the BIOS recalibrates and the health warning clears.
Laptop shuts down abruptly at 20–30% charge shown on the fuel gauge
This happens when the fuel gauge IC was calibrated against the old, degraded cell and has not yet recalibrated to the new one. The gauge shows 20–30% remaining, but the underlying voltage has already dropped below the BMS cutoff threshold under full CPU and display load — causing an instant shutdown. The fix is a full calibration cycle: discharge the laptop to automatic hibernate, then charge without interruption to 100%. Repeat this two to three times until the gauge tracks accurately down to below 10% before shutdown.