{"product_id":"meizu-mx4-pro-replacement-battery-38v-3350mah-li-polymer","title":"MeiZu MX4 Pro Replacement Battery BT41 3.8V 3350mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eMeiZu MX4 Pro — 3.8V Li-Polymer Replacement Battery (BT41)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.8V, 3350mAh Li-Polymer replacement battery for the MeiZu MX4 Pro smartphone. It fits models MX4 Pro, MX4SWDS0, and M462U. OEM part numbers BT41, N0004720, and US525972H4 all cross-reference to this cell.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMX4 Pro, MX4SWDS0, M462U compatibility:\u003c\/strong\u003e\n    These three models share the same 3.8V power rail, physical connector, and BMS handshake protocol. The cell dimensions — 69.85 × 58.20 × 4.54 mm — match the original chassis cavity 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 and discharge cycles on the MX4 Pro platform. The BMS accepted the new cell without triggering an over-voltage or under-voltage cutoff event.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle fuel gauge reset:\u003c\/strong\u003e\n    After installing this cell, disable fast charging and run one complete discharge down to auto-shutdown, then charge to 100% uninterrupted. This lets the fuel gauge IC map its coulomb counter against the new cell's actual discharge curve before high-current charging begins.\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 MX4 Pro after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe MX4 Pro's fuel gauge IC retains the discharge curve of the old, degraded cell in its coulomb counter. When the new cell hits a voltage point that the IC maps to \"empty,\" it triggers a shutdown — even though actual capacity remains. This is not a defective cell. One full uninterrupted discharge-charge cycle forces the IC to re-learn the voltage-to-capacity curve of the new cell. After that cycle, reported percentage aligns with real state of charge.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eMeiZu MX4 Pro not powering on after storage with a low or flat battery\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-Polymer cells that drop below approximately 2.5V per cell trigger a BMS lockout to prevent catastrophic discharge damage. The phone will show no signs of life — no boot screen, no charge indicator. Connect to a wall adapter rated at 5V\/1A or higher and leave it for 20–30 minutes without pressing the power button. The BMS recovery circuit needs a trickle current to bring the cell voltage above the lockout threshold before the phone will respond. Once the charge LED activates, normal charging has resumed.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43404196446298,"sku":"BWCS-MX430SL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43404196479066,"sku":"BWCS-MX430SL-2","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43404196511834,"sku":"BWCS-MX430SL-3","price":29.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-MX430SL-1.webp?v=1779369370","url":"https:\/\/batteryweb.com\/products\/meizu-mx4-pro-replacement-battery-38v-3350mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}