{"product_id":"meizu-meilan-u20-replacement-battery-385v-3200mah-li-polymer","title":"MeiZu Meilan U20 Replacement Battery BU15 3.85V 3200mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eMeiZu Meilan U20 — 3.85V Li-Polymer Replacement Battery (BU15)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.85V, 3200mAh lithium-polymer replacement battery for the MeiZu Meilan U20 and Meilan U20 Dual SIM. Part number BU15. It fits both single and dual SIM variants of the U20, which share the same battery bay geometry and connector orientation.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMeilan U20 and U20 Dual SIM compatibility:\u003c\/strong\u003e\n    Both U20 variants use the same physical cell format, contact pin layout, and BMS handshake protocol. The same BU15 battery services both boards without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through full charge cycles on a Meilan U20 board. The BMS accepted the cell without fault codes, and the charge IC communicated correctly across all charge states from 3.0V recovery up to 4.35V cutoff.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle fuel gauge recalibration:\u003c\/strong\u003e\n    On first use after installation, disable fast charging and run one complete discharge-charge cycle at standard rate. This lets the fuel gauge IC map the new cell's discharge curve before high-current charging pushes current into an uncalibrated state.\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 Meilan U20 after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe Meilan U20's fuel gauge IC holds a discharge curve built from the old cell's behaviour. A new cell has a different internal resistance profile, so the IC miscalculates remaining capacity. Under modem transmission or screen-brightness load, voltage sags faster than the IC expects, triggering a low-voltage shutdown before the display reaches 0%. One full discharge-charge cycle at standard current recalibrates the coulomb counter and eliminates the premature cutoff.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eDevice not powering on after the BU15 sat in storage\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLithium-polymer cells self-discharge in storage. If the BU15 dropped below 2.5V per cell, the BMS enters lockout mode and the phone will not respond to a normal charger. Connect the phone to a low-current USB source — a PC port or a 5V 500mA adapter — and leave it for 20–30 minutes without pressing the power button. The BMS recovery circuit needs sustained low current to exit lockout before the charge IC hands off to standard charge mode. Once the phone vibrates or the LED activates, normal charging can resume.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43392086278234,"sku":"BWCS-MX682XL-1","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43392086311002,"sku":"BWCS-MX682XL-2","price":29.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43392086343770,"sku":"BWCS-MX682XL-3","price":32.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-MX682XL-1.webp?v=1779143707","url":"https:\/\/batteryweb.com\/products\/meizu-meilan-u20-replacement-battery-385v-3200mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}