{"product_id":"asus-zenfone-3-52-replacement-battery-385v-2500mah-li-polymer","title":"Asus ZenFone 3 5.2 C11P1601 Replacement Battery 3.85V 2500mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eAsus ZenFone 3 5.2 \/ ZE520KL — 3.85V Li-Polymer Replacement Battery (C11P1601)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.85V, 2500mAh Li-Polymer cell that replaces the original C11P1601 battery in the Asus ZenFone 3 5.2 and ZE520KL. It fits ZE520KL variants including ZenFone 3 Dual SIM Global LTE. Capacity matches the factory spec at 9.63Wh.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eZE520KL and Dual SIM Global LTE fitment:\u003c\/strong\u003e\n    Both variants share the same battery bay dimensions, connector pinout, and BMS communication protocol — one cell fits all listed models without modification.\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 charge and load discharge on ZE520KL hardware. The BMS handshake completed correctly, charge current stepped down at 4.35V as expected, and the protection circuit tripped cleanly at the low-voltage cutoff.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle fuel gauge reset on the ZE520KL:\u003c\/strong\u003e\n    On first use after installation, disable fast charging and run one complete discharge-charge cycle at standard current. This lets the fuel gauge IC map the new cell's discharge curve before the charge IC begins pushing higher current into an uncalibrated cell.\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 ZE520KL after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens because the ZenFone 3's fuel gauge IC still holds the discharge curve of the old, degraded cell. The new cell hits a voltage cliff under modem or display load at a state-of-charge the IC has not yet mapped correctly. The phone reads 25% but the actual cell voltage has already dropped below the shutdown threshold. One full discharge-charge cycle at standard current rewrites the coulomb counter baseline and clears this behaviour.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eUSB fast charge not activating on the first cycle after replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eAfter fitting a new cell, the charge IC on the ZE520KL may default to standard 5V\/1A input until it confirms the BMS is responding within expected parameters. On a fresh cell with no charge history, the proprietary fast-charge handshake can be skipped on the first cycle. Complete one full standard charge first — the IC logs the cell's internal resistance and re-enables the fast-charge protocol from the second cycle onward. Confirm fast charge is active by checking the notification shade for the fast-charging indicator at 5V\/2A or above.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43392095256666,"sku":"BWCS-AUC520SL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43392095289434,"sku":"BWCS-AUC520SL-2","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43392095322202,"sku":"BWCS-AUC520SL-3","price":29.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-AUC520SL-1.webp?v=1779143747","url":"https:\/\/batteryweb.com\/products\/asus-zenfone-3-52-replacement-battery-385v-2500mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}