{"product_id":"srf-starxtrem-2-replacement-battery-38v-3400mah-li-polymer","title":"SRF StarXtrem 2 Replacement Battery 3.8V 3400mAh Li-Polymer","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSRF StarXtrem 2 — 3.8V Li-Polymer 3400mAh Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.8V Li-Polymer cell rated at 3400mAh (12.92Wh) for the SRF StarXtrem 2 and StarXtrem II smartphones. It replaces the original cell when the phone fails to hold charge, shuts down unexpectedly, or shows erratic battery percentage readings. Physical dimensions are 95.35 × 57.17 × 4.19mm — verify against your existing cell before installing.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eStarXtrem 2 and StarXtrem II compatibility:\u003c\/strong\u003e\n    Both model names reference the same hardware platform. The battery connector pinout, BMS handshake voltage, and physical footprint are identical across both variants — one cell fits both.\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 discharge on the StarXtrem 2 platform. The BMS accepted the charge curve without rejection, and the protection circuit tripped correctly at the low-voltage cutoff threshold.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first cycle:\u003c\/strong\u003e\n    On first use after installation, disable fast charging and run one complete discharge-to-charge cycle. The fuel gauge IC in the StarXtrem 2 calibrates itself against the new cell's discharge curve — skipping this step causes the percentage counter to read incorrectly against the fresh cell's actual capacity profile.\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 StarXtrem 2 after cell replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe StarXtrem 2 fuel gauge IC stores a learned discharge curve from the old cell. When a new cell is installed, the IC maps percentage readings against that old curve. A new Li-Polymer cell has a steeper voltage drop in the lower charge band, so the phone's modem and screen load pull the cell voltage below the BMS cutoff threshold before the OS registers critical battery level. The result is a hard shutdown that appears at 20–30% on the status bar. One full slow-charge cycle forces the coulomb counter to resync against the new cell's actual voltage floor.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eUSB charging stops being accepted immediately after fitting the new cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eOn the first connection after a cell swap, the charge IC on the StarXtrem 2 may not negotiate the charge protocol correctly with the new BMS — the handshake between the USB port controller and the replacement cell's protection circuit can time out on the first attempt. Disconnect the cable, power the phone off completely, then reconnect to a standard 5V charger rather than a fast-charge adapter. Once the first charge cycle completes at standard current, the BMS registers as initialised and fast charging resumes normally on subsequent connections.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43404238717018,"sku":"BWCS-OT802XL-1","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43404238749786,"sku":"BWCS-OT802XL-2","price":30.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43404238782554,"sku":"BWCS-OT802XL-3","price":33.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-OT802XL-1.webp?v=1779369464","url":"https:\/\/batteryweb.com\/products\/srf-starxtrem-2-replacement-battery-38v-3400mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}