{"product_id":"bea-fon-s10-replacement-battery-37v-1000mah-li-ion","title":"Bea-fon S10 Replacement Battery 3.7V 1000mAh Li-ion","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eBea-fon S10 — 3.7V Li-ion Replacement Battery (S10)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 1000mAh Li-ion replacement battery for the Bea-fon S10 mobile phone. It slots directly into the S10's battery bay and restores power to a phone that won't hold charge or won't switch on at all. Capacity listed is 1000mAh (3.7Wh) — matching the original cell specification.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eBea-fon S10 fitment:\u003c\/strong\u003e\n    The S10 uses a compact 53.70 × 36.85 × 5.30mm cell at 3.7V. This replacement matches those physical and electrical specs so the battery bay closes correctly and the charge IC sees the expected voltage rail on first boot.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through a full charge-discharge cycle on the S10 platform. The BMS accepted charge from the phone's onboard charge IC without fault codes, and voltage held steady across a screen-on load cycle.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    On first use after installation, run one complete discharge-to-charge cycle before relying on the percentage indicator. The S10's fuel gauge IC is calibrated to the old cell's discharge curve — one full cycle lets it remap against the new cell and report accurately.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the S10 reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe S10 tracks charge state using a fuel gauge IC that builds a model of the cell's discharge curve over time. When you swap to a new cell, that learned curve no longer matches the physical battery in the phone. The IC keeps using the old model, so it reports percentages that can be 15–25% off. One full discharge below 10% and a charge to 100% resets the coulomb counter and forces the IC to start learning the new cell's actual curve.\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 happens when the cell voltage drops sharply under load — a voltage cliff — before the fuel gauge reaches 0%. The S10's modem and display draw enough current to pull the cell below the BMS cutoff threshold while the gauge still shows charge remaining. It is not a faulty battery — it is the fuel gauge IC reading from an uncalibrated curve. Run two full discharge-charge cycles and the shutdowns will move progressively closer to 0%. If they persist past three cycles, check the resting voltage sits above 3.6V when the phone shows 30%.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43404307497050,"sku":"BWCS-BES100SL-1","price":22.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43404307529818,"sku":"BWCS-BES100SL-2","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43404307562586,"sku":"BWCS-BES100SL-3","price":27.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-BES100SL-1.webp?v=1779369642","url":"https:\/\/batteryweb.com\/products\/bea-fon-s10-replacement-battery-37v-1000mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}