{"product_id":"asus-zenfone-3-max-55-replacement-battery-385v-3400mah-li-polymer","title":"Asus Zenfone 3 Max 5.5 Replacement Battery 3.85V 3400mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eAsus Zenfone 3 Max 5.5 — 3.85V Li-Polymer Replacement Battery (C11P1609)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3400mAh Li-Polymer cell replacement for the Asus Zenfone 3 Max 5.5. It fits the ZC553KL, ZenFone 3 Max Dual SIM 5.5, and X00DDA variants. Voltage is 3.85V and energy output is 13.09Wh — pulled directly from product data, not estimated.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eZC553KL and X00DDA platform fit:\u003c\/strong\u003e\n    These variants share the same connector pinout, BMS handshake protocol, and 3.85V voltage rail. One cell part number — C11P1609 — covers all of them because the charge IC and fuel gauge IC are identical across the board.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through a full discharge-charge sequence on a ZC553KL unit. The BMS accepted the handshake without error flags, and the charge IC ramped to the correct constant-current phase without thermal cutoff triggering.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first cycle:\u003c\/strong\u003e\n    On first use after installation, disable fast charging and run one complete discharge down to auto-shutoff, then charge to 100% uninterrupted. This gives the coulomb counter a clean reference curve against the new cell before the charge IC starts pushing higher current loads.\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 Zenfone 3 Max 5.5\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis is a voltage cliff failure. The cell cannot hold its voltage above the BMS cutoff threshold when the modem, GPS, or screen pulls a current spike — even though the fuel gauge still reads 20–30%. The old cell's discharge curve is flatter and drops off a cliff under load well before the percentage suggests it should. A replacement cell with a fresh discharge curve eliminates the sag point that triggers the cutoff. After swapping, run one full calibration cycle so the fuel gauge IC maps the new curve correctly.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003ePhone reports wrong battery percentage after cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe fuel gauge IC on the ZC553KL uses a coulomb counter calibrated to the original cell's capacity and discharge curve. When a new cell goes in, that stored curve no longer matches actual cell behaviour, so the percentage readout drifts — often jumping erratically or showing 100% that drops to 80% within minutes. The fix is one full uninterrupted cycle: drain to automatic shutoff, then charge to 100% without interruption. That single cycle resets the coulomb counter reference and brings the percentage display back into alignment.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43392019955802,"sku":"BWCS-AUZ551SL-1","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43392019988570,"sku":"BWCS-AUZ551SL-2","price":28.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43392020021338,"sku":"BWCS-AUZ551SL-3","price":31.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-AUZ551SL-1.webp?v=1779142943","url":"https:\/\/batteryweb.com\/products\/asus-zenfone-3-max-55-replacement-battery-385v-3400mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}