{"product_id":"lenovo-thinkpad-p1-gen-4-20y3000kms-replacement-battery-1548v-5650mah-li-polymer","title":"Lenovo ThinkPad P1 Gen 4 5B11B79217 15.48V Replacement Battery","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eLenovo ThinkPad P1 Gen 4 \/ X1 Extreme Gen 5 — 15.48V Li-Polymer Replacement Battery (5B11B79217)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 15.48V, 5650mAh (87.46Wh) Li-Polymer battery for the Lenovo ThinkPad P1 Gen 4 and ThinkPad X1 Extreme Gen 5 mobile workstation series. It replaces OEM part numbers including 5B11B79217, L20D4P75, L20M4P75, and SB11B79216. The battery slots into the same bay as the original and connects to the same BMS interface on the motherboard.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eThinkPad P1 Gen 4 and X1 Extreme Gen 5 compatibility:\u003c\/strong\u003e\n    Both platforms share the same 15.48V four-cell Li-Polymer architecture, identical connector pinout, and the same Lenovo BMS handshake protocol — which is why a single cell part covers both lines.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell on a ThinkPad P1 Gen 4 motherboard and confirmed the BMS authenticated correctly, charge current ramped as expected, and no fault codes were thrown in Lenovo Vantage.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-install calibration on ThinkPad P1 Gen 4:\u003c\/strong\u003e\n    After fitting this cell, run one full discharge to hibernate cutoff, then charge uninterrupted to 100%. This forces the BIOS battery learn cycle to reset against the new cell data and clears the inaccurate health warning that appears after every cell swap.\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 immediately after replacement\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe ThinkPad BIOS stores battery health data in EEPROM on the motherboard, not on the cell itself. When a new cell goes in, the BIOS compares live readings against the degraded baseline it built for the old cell, which makes the new battery look worse than it is. Running the battery learn cycle — full discharge to hibernate cutoff, then a single uninterrupted charge to 100% — forces the BIOS to rewrite that baseline against the new cell's actual voltage curve. After one or two cycles, Lenovo Vantage and the BIOS health screen should read normal.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eLaptop shuts down at 20–30% shown on the fuel gauge\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the fuel gauge IC hasn't yet mapped the new cell's voltage-to-capacity curve. Under full CPU plus discrete GPU load, the cell hits a voltage cliff that the uncalibrated gauge hasn't accounted for, so the system cuts out while the display still shows charge remaining. It is not a faulty cell — it is the fuel gauge IC working from stale data. Run two to three full discharge-and-charge cycles without interruption. By the third cycle the gauge IC will have recalibrated and the reported percentage will track actual cell voltage accurately down to the low single digits.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43409550245978,"sku":"BWCS-LPD142NB-1","price":98.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43409550278746,"sku":"BWCS-LPD142NB-2","price":116.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43409550311514,"sku":"BWCS-LPD142NB-3","price":129.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-LPD142NB-1.webp?v=1779580030","url":"https:\/\/batteryweb.com\/products\/lenovo-thinkpad-p1-gen-4-20y3000kms-replacement-battery-1548v-5650mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}