{"product_id":"zte-grand-s-replacement-battery-38v-1750mah-li-polymer","title":"ZTE Grand S Li3817T43P3h724940 Replacement Battery 3.8V","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eZTE Grand S \/ Z753 — 3.8V Li-Polymer Replacement Battery (Li3817T43P3h724940)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.8V, 1750mAh Li-Polymer cell replaces the original battery in the ZTE Grand S, Grand S LTE, Z753, and Athena. It uses OEM part number Li3817T43P3h724940 and fits the same connector and battery bay without modification. Capacity is 6.65Wh — matching the stock cell's energy spec.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eGrand S \/ Z753 platform compatibility:\u003c\/strong\u003e\n    These models share the same battery bay dimensions, connector pinout, and BMS handshake protocol across the Grand S line. The 72.02 × 47.58 × 4.04mm cell fits the cavity without pressure on the display flex cable.\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 a Grand S unit. The BMS accepted the charge handshake without fault codes, and the protection circuit triggered correctly at low-voltage cutoff — no thermal event, no overcharge pass-through.\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 full discharge-charge cycle at standard current. This lets the fuel gauge IC map the new cell's discharge curve 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 Grand S after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe Grand S uses a coulomb-counter fuel gauge IC that was calibrated against the old cell's discharge curve. A new cell with a slightly different voltage-to-capacity curve causes the IC to misjudge the remaining charge. When the modem fires during a call or the display hits peak brightness, current draw spikes and the cell voltage drops below the BMS cutoff threshold — even though the OS still shows charge remaining. Run one full discharge to 0% and a complete charge to 100% without interruption. The IC recalibrates its curve endpoint and the shutdowns stop.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eOS reporting wrong battery percentage after replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eAfter swapping in a new cell, the Grand S fuel gauge IC still holds the learned capacity data from the old degraded battery. It will show inflated or erratic percentages — often jumping 5–10% in either direction — because the reference points no longer match the new cell's actual voltage curve. The fix is a full calibration cycle: drain the phone until it shuts off automatically, then charge uninterrupted to 100% with the screen off. After one complete cycle, the coulomb counter resets its endpoints to the new cell and percentage readings stabilise.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43404264046682,"sku":"BWCS-ZTV988XL-1","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43404264079450,"sku":"BWCS-ZTV988XL-2","price":28.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43404264112218,"sku":"BWCS-ZTV988XL-3","price":31.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-ZTV988XL-1.webp?v=1779369525","url":"https:\/\/batteryweb.com\/products\/zte-grand-s-replacement-battery-38v-1750mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}