{"product_id":"motorola-moto-edge-20-5g-replacement-battery-389v-3400mah-li-polymer","title":"Motorola MB40 Moto Edge 20 5G Replacement Battery 3.89V 3400mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eMotorola Moto Edge 20 5G — 3.89V Li-Polymer Replacement Battery (MB40)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3400mAh (13.23Wh) Li-Polymer cell at 3.89V, built as a direct swap for the Motorola Moto Edge 20 5G. It covers model numbers XT2143 and XT2143-1, along with the Edge 20 5G 2021 variant. OEM part references are MB40 and SB18D10750.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eXT2143 series compatibility:\u003c\/strong\u003e\n    All XT2143 variants share the same PCB connector pitch, cell dimensions (80.40 × 64.20 × 4.00mm), and BMS communication protocol. The cell slot and flex cable routing are identical across the lineup, so one cell fits the full range without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell on an XT2143-1 unit and monitored BMS handshake, charge acceptance from 0%, and thermal response across a full cycle. The charge IC accepted the cell cleanly and the protection circuit engaged correctly at both low-voltage and high-voltage limits.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    On first installation, disable fast charging and run one complete discharge-charge cycle at standard rate. The Moto Edge 20 5G's fuel gauge IC maps its coulomb counter against the cell's discharge curve — skipping this step leaves the IC calibrated to the old, degraded cell and causes inaccurate percentage readings.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSudden shutdown at 20–30% on the replacement cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Moto Edge 20 5G runs a Snapdragon 778G with a 5G modem — both pull sharp current spikes under load. A new cell that hasn't been calibrated yet can hit a voltage cliff under that combined draw even when the OS reads 25% remaining. The fuel gauge IC still holds the discharge curve of the original degraded cell, so its percentage estimate diverges from actual cell voltage. Run one full discharge to 0% and a full charge to 100% on standard charging to resync the coulomb counter. After that cycle, shutdowns below 15% should stop.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eUSB-PD fast charge not triggering on first cycle after swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Edge 20 5G uses TurboPower charging via USB-PD negotiation between the charger and the phone's charge IC. On the first cycle with a new cell, the BMS may present a higher internal impedance than expected, causing the charge IC to fall back to standard 5W input rather than negotiate higher wattage. This is not a fault in the cell or the charger. Complete one full standard-rate charge cycle first — once the cell's impedance normalises, TurboPower negotiation resumes correctly on the second cycle. Confirm by watching the charging indicator; it should switch to TurboPower animation within the first minute of the second charge session.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43391872368730,"sku":"BWCS-MXT214SL-1","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43391872401498,"sku":"BWCS-MXT214SL-2","price":29.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43391872434266,"sku":"BWCS-MXT214SL-3","price":32.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-MXT214SL-1.webp?v=1779142413","url":"https:\/\/batteryweb.com\/products\/motorola-moto-edge-20-5g-replacement-battery-389v-3400mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}