{"product_id":"zte-z965-replacement-battery-385v-3000mah-li-polymer","title":"ZTE Z965 Li3930T44P6h816437 Compatible Battery 3.85V 3000mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eZTE Z965 \/ Blade X — 3.85V Li-Polymer Replacement Battery (Li3930T44P6h816437)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.85V, 3000mAh (11.55Wh) lithium-polymer cell that fits the ZTE Z965 and ZTE Blade X smartphones. It replaces OEM part number Li3930T44P6h816437 and matches the original connector, dimensions, and BMS handshake. The cell measures 79.30 × 63.18 × 3.45mm — check clearance before installing if your unit has third-party adhesive residue from a previous swap.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eZ965 and Blade X shared platform:\u003c\/strong\u003e\n    Both devices run on the same voltage rail and use the same connector pinout, so they share this cell. The BMS on each model negotiates charge termination the same way — no firmware conflict between variants.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through charge and discharge on the Z965 platform. The BMS accepted the full 3000mAh rated capacity, held charge termination correctly at 4.35V, and did not trip low-voltage cutoff during a simulated modem and display load.\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 down to automatic shutdown, then charge uninterrupted to 100%. This gives the fuel gauge IC one full reference cycle against the new cell's discharge curve before high-current charging begins on 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 Z965 after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe Z965's fuel gauge IC stores a discharge curve from the original cell. A new cell has a different internal resistance profile, so the IC miscalculates remaining capacity. Under modem load — during a call or LTE data burst — the cell voltage sags below the shutdown threshold before the percentage reaches zero. The phone cuts out even though the display showed charge remaining. One full discharge-charge cycle without fast charging resets the coulomb counter and maps the new cell's actual voltage cliff, usually sitting around 3.4–3.5V under load.\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\"\u003eOn the first charge after installation, the charge IC on the Z965 may default to standard 5V\/1A input and not negotiate the higher voltage profile. This happens because the BMS on a new cell starts with conservative thresholds until it confirms cell temperature and impedance are within range. Plug the phone in for a full uninterrupted charge at standard rate — do not disconnect mid-cycle. On the second charge, the IC typically resumes fast charge negotiation once the BMS has cleared its first-cycle validation check at 4.35V termination.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43392038797402,"sku":"BWCS-VF710SL-1","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43392038830170,"sku":"BWCS-VF710SL-2","price":30.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43392038862938,"sku":"BWCS-VF710SL-3","price":33.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-VF710SL-1.webp?v=1779143086","url":"https:\/\/batteryweb.com\/products\/zte-z965-replacement-battery-385v-3000mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}