{"product_id":"lenovo-thinkpad-x1-fold-gen-1-20rl000hpg-replacement-battery-772v-6400mah-li-polymer","title":"Lenovo ThinkPad X1 Fold Gen 1 Compatible Battery L19L4P70 7.72V","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eLenovo ThinkPad X1 Fold Gen 1 — 7.72V Li-Polymer Replacement Battery (L19L4P70)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 7.72V, 6400mAh (49.41Wh) Li-Polymer cell replaces the original L19L4P70 battery in the ThinkPad X1 Fold Gen 1 series. It fits the 20RL000HPG, 20RL0015IV, 20RL000YBM, 20RL001LYA, and 123 additional X1 Fold Gen 1 variants. Same voltage, same connector, same BMS handshake as the factory cell.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eX1 Fold Gen 1 platform fit:\u003c\/strong\u003e\n    Every 20RL-series model shares the same battery bay geometry, 7.72V rail, and L19-series BMS protocol. That common architecture means one cell covers the full production run without adapter or firmware workarounds.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell on a ThinkPad X1 Fold Gen 1 unit and confirmed the BMS handshake completed on first boot — Windows reported full Wh capacity within two charge cycles, and thermal cutoff thresholds matched factory spec.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-install calibration on the X1 Fold:\u003c\/strong\u003e\n    After fitting, run one full discharge down 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 X1 Fold cell\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe ThinkPad BIOS reads health data from the cell's EEPROM and compares it against the previous cell's logged cycle count and capacity history. A fresh cell has no accumulated data, so the BIOS flags it as degraded or unknown on first boot. This is a firmware interpretation issue, not a fault with the new cell. Run the battery learn cycle — full discharge to hibernate-cutoff followed by an uninterrupted charge to 100% — and the BIOS recalibrates against the new cell's EEPROM within two cycles.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eX1 Fold shutting down at 20–30% charge shown on screen\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe foldable display and CPU together draw peak current that a degraded or poorly calibrated cell cannot sustain at lower state-of-charge — voltage drops below the BMS cutoff threshold before the fuel gauge reaches 0%. The fuel gauge IC is reading stored EEPROM data from the old cell, so its percentage estimate is wrong. Recalibrate by running the full discharge-to-hibernate cycle once, which forces the fuel gauge IC to map the new cell's actual voltage curve. After that reset, the shutdown threshold should align to 5–8% remaining at approximately 6.0V under load.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43409570758746,"sku":"BWCS-LVF120NB-1","price":62.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43409570791514,"sku":"BWCS-LVF120NB-2","price":73.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43409570824282,"sku":"BWCS-LVF120NB-3","price":82.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-LVF120NB-1.webp?v=1779580060","url":"https:\/\/batteryweb.com\/products\/lenovo-thinkpad-x1-fold-gen-1-20rl000hpg-replacement-battery-772v-6400mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}