{"product_id":"sony-ericsson-xperia-z4-replacement-battery-38v-2900mah-li-polymer","title":"Sony Ericsson Xperia Z4 Replacement Battery LIS1579ERPC 3.8V 2900mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSony Ericsson Xperia Z4 \/ Z3+ — 3.8V Li-Polymer Replacement Battery (LIS1579ERPC)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.8V, 2900mAh Li-Polymer battery replaces the original LIS1579ERPC cell in the Sony Ericsson Xperia Z4, Xperia Z3+, and Xperia Z3 Plus. It also fits the E6533 and over a dozen additional variants sharing the same battery bay and connector. Use it when the original cell no longer holds a useful charge or the phone shuts down unexpectedly under load.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eXperia Z4 and Z3+ platform fit:\u003c\/strong\u003e\n    Sony Ericsson used the same 3.8V rail, battery connector, and BMS handshake across the Z4, Z3+, and Z3 Plus lines. All three models share the LIS1579ERPC footprint, so one replacement cell covers the full group without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell on a Z4 unit and confirmed the BMS accepted the new cell without fault codes. Charge acceptance was normal from the first cycle, and the phone completed a full charge-discharge loop without thermal events or cutoffs.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    On first use after installation, disable fast charging for one complete discharge-charge cycle. This allows the fuel gauge IC to recalibrate its discharge curve against the new cell 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 Xperia Z4 after a cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens because the fuel gauge IC is still running the discharge curve from the old, degraded cell. The new cell has a different voltage-to-capacity profile, so the phone reads 20–30% when the cell is actually near its low-voltage cutoff. Under screen or modem load, voltage drops sharply and the system shuts down to protect the cell. Run one full discharge to below 5% and a full charge to 100% without interruption — this resets the coulomb counter and aligns the gauge to the new cell curve.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003ePhone not powering on after the replacement battery sat in storage\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-Polymer cells self-discharge in storage. If the cell dropped below approximately 2.5V per cell, the BMS enters a lockout state and blocks normal charging to prevent thermal risk. The phone will show nothing on screen when plugged in. Connect to a wall charger — not a PC USB port — and leave it for 20–30 minutes without pressing the power button. Once the BMS detects voltage recovery above its threshold, charging resumes normally and the phone will boot.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43404158861402,"sku":"BWCS-ERZ400SL-1","price":24.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43404158894170,"sku":"BWCS-ERZ400SL-2","price":27.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43404158926938,"sku":"BWCS-ERZ400SL-3","price":30.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-ERZ400SL-1.webp?v=1779369252","url":"https:\/\/batteryweb.com\/products\/sony-ericsson-xperia-z4-replacement-battery-38v-2900mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}