{"product_id":"zte-u288-replacement-battery-37v-1200mah-li-ion","title":"ZTE U288 Replacement Battery Li3710T42P3h623846 3.7V 1200mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eZTE U288 \/ S207 — 3.7V Li-ion Replacement Battery (Li3710T42P3h623846)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 1200mAh Li-ion cell built to the OEM spec for the ZTE U288 and S207 smartphones. It fits the original battery slot with matching connector and dimensions (62.64 × 38.02 × 4.82 mm). Voltage and capacity match the Li3710T42P3h623846 part number exactly.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eU288 and S207 compatibility:\u003c\/strong\u003e\n    Both models run on the same 3.7V single-cell platform and use the same connector pinout and BMS handshake protocol. One cell covers both devices 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 charge and discharge on the U288 platform. The BMS accepted the cell without triggering a fault, and the charge IC completed a full CC\/CV cycle to 4.2V.\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 for one complete discharge-charge cycle. This lets the fuel gauge IC recalibrate against the new cell's discharge curve before high-current charging pushes 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\"\u003eWhy the U288 reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe fuel gauge IC on the U288 uses a coulomb counter that was trained on the original cell's discharge curve. When a new cell goes in, the stored curve no longer matches actual cell voltage under load. The phone reads a stale lookup table and reports whatever percentage the old curve predicted at that voltage. One full discharge-to-shutdown followed by an uninterrupted charge to 100% resets the counter and lets the IC build a fresh curve for the new cell.\u003c\/p\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 is a voltage cliff issue, not a capacity problem. Under modem activity or screen-on load, current draw spikes and the cell voltage drops sharply — faster than the fuel gauge predicted. The phone's hardware protection circuit sees the voltage dip and cuts power before the reported percentage reaches zero. After completing the first full calibration cycle described above, the fuel gauge IC learns the new cell's actual voltage sag profile and the early shutdowns stop. If they persist after two full cycles, check that the connector is fully seated — a loose pin raises contact resistance and worsens the sag.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43404263391322,"sku":"BWCS-ZTU288SL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43404263424090,"sku":"BWCS-ZTU288SL-2","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43404263456858,"sku":"BWCS-ZTU288SL-3","price":28.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-ZTU288SL-1.webp?v=1779369511","url":"https:\/\/batteryweb.com\/products\/zte-u288-replacement-battery-37v-1200mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}