{"product_id":"xiaomi-mi-13-replacement-battery-388v-4300mah-li-polymer","title":"Xiaomi Mi 13 BP4G Compatible Battery 3.88V 4300mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eXiaomi Mi 13 \/ Mi 13 5G — 3.88V Li-Polymer Replacement Battery (BP4G)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThe BP4G is a 3.88V, 4300mAh (16.68Wh) Li-Polymer cell that slots directly into the Xiaomi Mi 13 and Mi 13 5G. It covers both regional variants — model numbers 2211133C and 2211133G. This replacement targets phones where the original cell has degraded and can no longer hold adequate charge under daily load.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMi 13 and Mi 13 5G compatibility:\u003c\/strong\u003e\n    Both the standard Mi 13 and its 5G counterpart share the same battery bay dimensions, connector pinout, and BMS handshake protocol. The 78.00 × 61.00 × 5.40mm cell footprint is identical across 2211133C and 2211133G boards, so one part number covers all four variants.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell on Mi 13 hardware and confirmed BMS handshake, charge termination at 4.40V, and correct fuel gauge IC recognition. The protection circuit tripped correctly on simulated short-circuit and over-discharge conditions.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    After installation, disable fast charging and run one complete discharge-to-charge cycle at standard current. This lets the fuel gauge IC map the new cell's discharge curve before Xiaomi's high-current fast charging protocol pushes current into an uncalibrated cell — preventing erratic percentage readings early on.\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 Mi 13 after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThis is a voltage cliff issue, not a capacity issue. A new cell with an uncalibrated fuel gauge IC can show 25% remaining while the actual cell voltage has already dropped below what the Snapdragon 8 Gen 2 and 5G modem demand under peak load. The phone's PMIC interprets this as an emergency low-voltage condition and cuts power to protect the board. One full discharge cycle — letting the phone run down to automatic shutdown, then charging uninterrupted to 100% — resets the coulomb counter against the new cell's real curve. After that cycle, the reported percentage tracks actual cell voltage correctly.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eUSB-PD or Xiaomi HyperCharge not activating on first cycle after replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eOn the first charge after a cell swap, the charge IC on the Mi 13 may default to standard 5V\/0.9A input rather than negotiating fast-charge protocols. This happens because the BMS flags an unrecognised cell state and holds the charge IC in a conservative mode until it completes one baseline charge cycle. The fix is straightforward: charge the phone fully at whatever rate the charger delivers on that first cycle without interrupting it. On the second charge, HyperCharge or USB-PD negotiation resumes normally — confirm by checking that the charger brick warms up within the first two minutes of connection.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43391805390938,"sku":"BWCS-MUM134SL-1","price":40.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43391805423706,"sku":"BWCS-MUM134SL-2","price":47.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43391805456474,"sku":"BWCS-MUM134SL-3","price":52.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-MUM134SL-1.webp?v=1779142222","url":"https:\/\/batteryweb.com\/products\/xiaomi-mi-13-replacement-battery-388v-4300mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}