{"product_id":"sony-vaio-vgn-u50-replacement-battery-111v-4200mah-li-ion","title":"Sony VAIO VGN-U50 Replacement Battery VGP-BPS1 11.1V 4200mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSony VAIO VGN-U50 \/ VGN-U70 Series — 11.1V Li-ion Replacement Battery (VGP-BPS1)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 11.1V, 4200mAh Li-ion battery replaces the VGP-BPS1 and VGP-BPL1 cells in the Sony VAIO U-series ultra-portable laptops. It fits the VGN-U50, VGN-U70, VGN-U8G, VGN-U8C, and related U-series models. Capacity is 46.62Wh — matched to the original Sony specification.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eVAIO U-series compatibility:\u003c\/strong\u003e\n    The VGN-U50, VGN-U70, VGN-U8G, and VGN-U8C all share the same 11.1V three-cell battery bay, connector pinout, and BMS handshake protocol — which is why one cell fits the full U-series lineup without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell on a VGN-U series unit and confirmed the BMS negotiated correctly, charge termination triggered at full capacity, and discharge protection cut in at the expected low-voltage threshold without premature shutdown.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle calibration on VAIO U-series:\u003c\/strong\u003e\n    After installing, 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 on this platform.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the VAIO VGN-U50 shuts down at 20–30% after a battery swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe VGN-U50 uses a fuel gauge IC that retains learned voltage-curve data from the previous cell. When a new cell is installed, the old curve causes the gauge to misread remaining capacity — the laptop thinks 20% is the floor and initiates shutdown even though charge remains. The fix is a full discharge-to-hibernate followed by an uninterrupted charge to 100%. After two or three full cycles, the fuel gauge IC recalibrates against the new cell's voltage profile and the cutoff point corrects itself.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBIOS reports battery health as \"poor\" or capacity as 0% immediately after install\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens because the BIOS reads health data from EEPROM fields written by the original cell — the new cell's EEPROM starts without a charge history, so the BIOS flags it as degraded. It is not a fault with the replacement cell. Run one full discharge-to-hibernate, then charge uninterrupted to 100% to initialize the learn cycle. After the first complete cycle, the BIOS health readout on the VGN-U series typically updates to reflect accurate capacity above 90%.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43410822561882,"sku":"BWCS-BPS1HB-1","price":67.99,"currency_code":"USD","in_stock":false},{"title":"Warranty 2 Year","offer_id":43410822594650,"sku":"BWCS-BPS1HB-2","price":79.99,"currency_code":"USD","in_stock":false},{"title":"Warranty 3 Year","offer_id":43410822627418,"sku":"BWCS-BPS1HB-3","price":87.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-BPS1HB-big.webp?v=1779581242","url":"https:\/\/batteryweb.com\/products\/sony-vaio-vgn-u50-replacement-battery-111v-4200mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}