{"product_id":"lenovo-yoga-duet-2020-replacement-battery-77v-5250mah-li-polymer","title":"Lenovo Yoga Duet 2020 Replacement Battery 7.7V 5250mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eLenovo Yoga Duet 2020 — 7.7V Li-Polymer Replacement Battery (L19C4PD8)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 7.7V, 5250mAh (40.43Wh) Li-Polymer battery for the Lenovo Yoga Duet 2020, a 2-in-1 convertible tablet-laptop hybrid. It replaces OEM part numbers L19C4PD8, L19M4PD8, SB10X87837, and SB10X87838. If your Yoga Duet 2020 no longer holds a charge or powers on, this cell directly addresses that failure.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eYoga Duet 2020 fitment:\u003c\/strong\u003e\n    The Yoga Duet 2020 uses a slim 3.60mm Li-Polymer cell to fit inside its tablet-form chassis. All four OEM part numbers above cross to this same cell configuration — same voltage rail, same BMS handshake, same connector pinout. No modification needed.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through charge and discharge cycles on Yoga Duet 2020 hardware. The BMS communicated correctly with the firmware, charge acceptance was normal from 0% to 100%, and no unexpected cutoffs occurred under combined CPU and display load.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-install calibration on the Yoga Duet 2020:\u003c\/strong\u003e\n    After fitting this cell, run one full discharge to hibernate-cutoff, then charge uninterrupted to 100% without using the device. 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 poor battery health immediately after replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Yoga Duet 2020 BIOS reads health data stored in the old cell's EEPROM and compares it against the new cell on first boot. Because the new cell hasn't completed a learn cycle, the BIOS flags it as degraded or unknown — even when the cell is brand new. This is a firmware calibration issue, not a fault with the replacement cell. Run the calibration cycle described above and the health indicator will update to reflect the actual cell state within one to two full charge cycles.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eYoga Duet 2020 shutting down at 20–30% remaining 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. When the new cell hits a voltage point that the IC associates with near-empty on the old cell, it triggers a forced shutdown — even though real capacity remains. The cell voltage at that cutoff point is typically around 7.0V under load, which is well above true empty for Li-Polymer. A full discharge-to-hibernate followed by an uninterrupted charge to 100% forces the fuel gauge IC to re-map its curve against the new cell and resolves the premature shutdowns.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43409652613210,"sku":"BWCS-LVY202NB-1","price":73.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43409652645978,"sku":"BWCS-LVY202NB-2","price":86.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43409652678746,"sku":"BWCS-LVY202NB-3","price":95.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-LVY202NB-1.webp?v=1779580312","url":"https:\/\/batteryweb.com\/products\/lenovo-yoga-duet-2020-replacement-battery-77v-5250mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}