{"product_id":"lenovo-xiaoxin-air-15-2019-replacement-battery-152v-4550mah-li-polymer","title":"Lenovo Xiaoxin Air 15 2019 Replacement Battery 15.2V 4550mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eLenovo Xiaoxin Air 15 2019 — 15.2V Li-Polymer Replacement Battery (5B10T09090)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 15.2V, 4550mAh (69.16Wh) Li-Polymer battery is a direct replacement for the Lenovo Xiaoxin Air 15 2019 notebook. It carries OEM part numbers 5B10T09090, 5B10W67209, L18M4PF5, SB10W67172, L18L4PF0, and L18L4PF4. If your original cell no longer holds a charge or the laptop has lost its portability, this replaces it at the correct voltage and capacity.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eXiaoxin Air 15 2019 fitment:\u003c\/strong\u003e\n    The 2019 Xiaoxin Air 15 uses a 15.2V four-cell Li-Polymer configuration with a specific BMS handshake tied to the L18-series part numbers. All listed OEM numbers reference the same voltage rail and connector pinout for this chassis generation.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through charge and discharge on the Xiaoxin Air 15 platform. The BMS communicated correctly with the system, accepted a full charge to 15.2V, and the protection circuit tripped at the expected low-voltage cutoff without thermal events.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-install calibration on the Xiaoxin Air 15:\u003c\/strong\u003e\n    After fitting this cell, 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\"\u003eBIOS reporting battery health as poor after replacing the Xiaoxin Air 15 cell\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eLenovo's BIOS reads health data from EEPROM on the battery pack. When a new cell installs, the EEPROM values don't match the BIOS's stored baseline from the old pack, so it flags the battery as degraded or unknown. This is a firmware calibration gap, not a fault with the replacement cell. Run one full discharge-to-hibernate followed by an uninterrupted charge to 100% — after one to two cycles the BIOS learn cycle completes and the health status corrects itself.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eLaptop shuts down at 20–30% charge shown after battery swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens because the fuel gauge IC is still calibrated to the old cell's discharge curve. It misreads state-of-charge on the new pack, and when the actual cell voltage drops under combined CPU and display load, the system hits a hard cutoff before the displayed percentage reaches zero. The fix is the same learn cycle: discharge fully to hibernate-cutoff, then charge to 100% without interruption. After two full cycles the fuel gauge IC re-maps to the new cell's curve and the shutdown behaviour stops.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43409648648282,"sku":"BWCS-LVA150NB-1","price":77.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43409648681050,"sku":"BWCS-LVA150NB-2","price":90.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43409648713818,"sku":"BWCS-LVA150NB-3","price":101.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-LVA150NB-1.webp?v=1779580296","url":"https:\/\/batteryweb.com\/products\/lenovo-xiaoxin-air-15-2019-replacement-battery-152v-4550mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}