{"product_id":"lenovo-xiaoxin-v4000-replacement-battery-144v-2200mah-li-ion","title":"Lenovo XiaoXin V4000 Compatible Battery 14.4V L14S4A01","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eLenovo XiaoXin V4000 \/ Z51 Series — 14.4V Li-ion Replacement Battery (L14S4A01)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 14.4V, 2200mAh (31.68Wh) Li-ion replacement battery for the Lenovo XiaoXin V4000, Y50C, Z51, and Z51-70 notebooks. It slots into the same bay as the original L14S4A01 cell and connects via the same BMS-managed connector. Install it when the original unit no longer holds charge or the system reports critical battery failure.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eXiaoXin V4000 \/ Z51 platform fit:\u003c\/strong\u003e\n    These models share a common 14.4V four-cell architecture, the same physical connector pinout, and identical BMS handshake protocol — which is why one part number covers all of them.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran charge-discharge cycles on this cell using a Z51-70 unit. The BMS accepted the cell without fault flags, balanced all four cells within spec, and the protection circuit tripped correctly at the rated low-voltage cutoff.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-install calibration on Lenovo IdeaPad firmware:\u003c\/strong\u003e\n    After fitting, run the laptop on battery until it reaches hibernate cutoff — do not interrupt. 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 firmware line.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Z51 shuts down at 20–30% shown after a battery swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe Z51 and XiaoXin V4000 use a fuel gauge IC that retains capacity data calibrated to the old cell. When a new cell is installed, the IC's stored curve no longer matches the new cell's actual voltage-to-capacity relationship. Under full CPU and display load, voltage drops faster than the gauge predicts, and the system hits the low-voltage hardware cutoff before the reported percentage reaches zero. One full discharge-to-hibernate cycle followed by an uninterrupted charge to 100% forces the IC to recalibrate against the new cell.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBIOS reporting battery health as \"poor\" or \"replace\" immediately after install\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLenovo's BIOS reads battery health from EEPROM data carried over from the previous cell's wear history — not from live readings off the new cell. The \"poor\" flag is stale data, not a fault with the replacement. Run Lenovo Vantage or the built-in battery diagnostic, then complete one full learn cycle: discharge to hibernate, charge uninterrupted to 100%. After the learn cycle completes, the BIOS re-reads actual cell data and the health status updates to normal.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43409735909466,"sku":"BWCS-LVZ517NB-1","price":100.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43409735942234,"sku":"BWCS-LVZ517NB-2","price":115.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43409735975002,"sku":"BWCS-LVZ517NB-3","price":125.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-LVZ517NB-1.webp?v=1779580625","url":"https:\/\/batteryweb.com\/products\/lenovo-xiaoxin-v4000-replacement-battery-144v-2200mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}