{"product_id":"lenovo-y9000k-2020-replacement-battery-1536v-5250mah-li-polymer","title":"Lenovo Y9000K Compatible Battery 15.36V 5250mAh L19M4PC2","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eLenovo Legion Y9000K 2020 — 15.36V Li-Polymer Replacement Battery (L19M4PC2)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 15.36V, 5250mAh (80.64Wh) lithium-polymer cell replaces the factory battery in the Lenovo Legion Y9000K 2020 and related Legion 7 \/ Legion 7i 15-inch platforms. It also fits the Y7000 2020 and other models sharing the L19M4PC2 \/ L19C4PC2 OEM part numbers. Voltage, connector pinout, and BMS communication protocol match the original spec.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eLegion 7 \/ Y9000K platform fitment:\u003c\/strong\u003e\n    These models share a common 15.36V four-cell architecture, the same physical connector, and an identical BMS handshake sequence. That is why a single cell covers the Y9000K 2020, Legion 7 15IMH, Legion 7i 15IMH, and Y7000 2020 — the voltage rail and EEPROM communication spec are identical across the lineup.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell on a Legion 7i 15IMH chassis and monitored BMS handshake, charge acceptance, and ACPI reporting through a full charge cycle. The BMS completed cell recognition without error flags, and ACPI battery data populated correctly within the first charge session.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle reset procedure:\u003c\/strong\u003e\n    After fitting this cell, run the laptop unplugged until it reaches hibernate cutoff — do not interrupt. Then charge uninterrupted to 100%. This single discharge-charge cycle resets the BIOS battery learn cycle and clears the inaccurate health or capacity warning that appears after every cell swap on Legion hardware.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Legion Y9000K shuts down at 20–30% after a battery swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe Legion BIOS uses stored discharge curves from the old cell to predict when voltage will collapse. A new cell has a different curve, so the firmware misjudges the knee point and triggers a protective shutdown well above actual depletion. This is not a fault in the replacement cell — it is a calibration mismatch between fresh chemistry and stale BIOS data. Running two to three full discharge-to-hibernate, then charge-to-100% cycles forces the fuel gauge IC to rebuild its model against the new cell. After those cycles, the shutdown point drops back to the correct low-battery threshold — typically around 5% remaining.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBIOS reporting 0% capacity or \"battery unknown\" on first boot after install\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Legion BIOS reads EEPROM data embedded in the battery's BMS to populate health, Wh rating, and charge state. On a cold install, the BMS and BIOS have not yet completed their handshake, so the system reports 0% or flags the battery as unknown. Plug in AC power and leave the laptop on for at least 10 minutes without rebooting — this allows the ACPI battery driver to complete the initial EEPROM read. If the 0% reading persists after that window, remove AC, hold the power button for 15 seconds to clear the BIOS power state, then reconnect and boot.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43409654317146,"sku":"BWCS-LVN715NB-1","price":111.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43409654349914,"sku":"BWCS-LVN715NB-2","price":128.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43409654382682,"sku":"BWCS-LVN715NB-3","price":141.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-LVN715NB-1.webp?v=1779580311","url":"https:\/\/batteryweb.com\/products\/lenovo-y9000k-2020-replacement-battery-1536v-5250mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}