About this replacement
Sony VAIO VPC-EA20 / VPC-EB / VPC-EC Series — 11.1V Li-ion Replacement Battery (VGP-BPS22)
This is an 11.1V, 4400mAh (48.84Wh) Li-ion replacement battery for the Sony VAIO VPC-EA20, VPC-EB10, VPC-EB20, VPC-EC20, and over 160 additional VAIO models. It replaces OEM part numbers VGP-BPS22, VGP-BPS22A, VGP-BPL22, VGP-BPS22/A, and VGP-BPS22A/P. Install it when the original cell no longer holds a useful charge or the VAIO refuses to run on battery at all.
- VPC-EA / VPC-EB / VPC-EC platform fit: These three series share the same 11.1V three-cell battery architecture, identical connector pinout, and the same BMS handshake protocol — which is why a single part number covers all of them. Swapping within the family requires no firmware change or hardware modification.
- Bench tested on actual hardware: We ran this cell on a VPC-EB unit. The BMS accepted charge immediately, the fuel gauge IC initialised correctly within the first full cycle, and the protection circuit tripped at the expected low-voltage threshold without a hard shutdown at mid-charge.
- First cycle after installation: After fitting, run the laptop down to hibernate cutoff on battery — do not plug in early — then charge uninterrupted to 100%. This forces the BIOS battery learn cycle to reset against the new cell and clears the inaccurate health warning that appears after every cell swap on VAIO hardware.
Why the VAIO BIOS reports poor battery health immediately after replacement
The VPC series BIOS stores battery health data in EEPROM and compares it against the new cell's reported state on first boot. Because the replacement cell has no charge history written to it, the BIOS flags it as degraded or unknown — not because anything is wrong, but because the learn cycle hasn't run yet. One full discharge-to-hibernate followed by an uninterrupted charge to 100% writes the baseline data the BIOS expects. After one or two cycles, the health indicator corrects itself without any driver or firmware intervention.
VAIO shutting down at 20–30% charge shown on the indicator
This symptom almost always points to the fuel gauge IC still running calibration data from the old, degraded cell — not a fault with the new battery. Under combined CPU and display load, the voltage drops faster than the uncalibrated gauge predicts, and the BMS cuts power before the displayed percentage reaches zero. Run two full discharge-to-hibernate cycles back-to-back, charging fully between each. After the second cycle, the fuel gauge IC recalibrates against the actual voltage curve of the new cell and the early shutdowns stop. If the issue persists after two cycles, check the BIOS battery report — a correctly recalibrated cell will show capacity above 4000mAh at 11.1V nominal.