{"product_id":"zte-grand-s-flex-replacement-battery-38v-2300mah-li-polymer","title":"ZTE Grand S Flex Li3823T43P3h715345 Replacement Battery 3.8V 2300mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eZTE Grand S Flex \/ MF910 — 3.8V Li-Polymer Replacement Battery (Li3823T43P3h715345)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.8V, 2300mAh Li-Polymer cell replacing OEM part Li3823T43P3h715345 and Li3820T43P3h715345. It fits the ZTE Grand S Flex smartphone and the MF910, MF910 4G LTE, and MF920 mobile hotspot series. Swap it when the original cell no longer holds a charge through a normal day.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eGrand S Flex and MF910 platform compatibility:\u003c\/strong\u003e\n    These devices share the same 3.8V battery bay dimensions and connector pinout — 71.16 × 52.05 × 4.35mm — so one cell covers both the smartphone and the hotspot variants. The BMS handshake on each device accepts the same charge profile.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through full charge and load discharge on the Grand S Flex. The BMS held charge termination correctly at 4.35V and triggered low-voltage cutoff without false trips under steady display and modem load.\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 and run one complete discharge-charge cycle at standard rate. This lets the fuel gauge IC map the new cell's discharge curve before high-current charging pushes current into an uncalibrated counter.\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 replacement cell\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. When the new cell hits a voltage point that the old curve mapped to 20–30%, the OS sees a cliff and forces shutdown — even though real capacity remains. The fix is one full uninterrupted discharge to auto-off, then a full charge without interruption. After that cycle, the coulomb counter resets against the new cell's actual curve and percentage readings stabilise.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eUSB fast charge not accepted on the first cycle after fitting\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eOn the first cycle, the charge IC on the Grand S Flex may not negotiate the fast-charge protocol with a new high-impedance cell — it defaults to standard 5V\/1A as a safety fallback. This is normal BMS behaviour, not a fault with the cell. Let the first full charge complete at standard rate. Fast charge negotiation typically resumes correctly from the second cycle onward once the BMS confirms cell impedance is within range.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43404235145306,"sku":"BWCS-ZTF230SL-1","price":24.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43404235178074,"sku":"BWCS-ZTF230SL-2","price":27.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43404235210842,"sku":"BWCS-ZTF230SL-3","price":30.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-ZTF230SL-1.webp?v=1778773896","url":"https:\/\/batteryweb.com\/products\/zte-grand-s-flex-replacement-battery-38v-2300mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}