{"product_id":"uscellular-galaxy-s3-replacement-battery-38v-2100mah-li-ion","title":"USCellular Galaxy S3 Replacement Battery 3.8V 2100mAh Li-ion","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eUSCellular Galaxy S3 \/ SCH-R530 — 3.8V Li-ion 2100mAh Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.8V Li-ion cell rated at 2100mAh (7.98Wh) for the Samsung Galaxy S3 and Galaxy SIII, including the SCH-R530 and Galaxy SIII LTE variants sold through USCellular. It slots into the removable battery compartment and connects via the standard three-contact pogo strip on the S3 chassis.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSCH-R530 and SIII LTE compatibility:\u003c\/strong\u003e\n    Both the standard SIII and the LTE variant share the same 3.8V voltage rail, identical physical footprint, and the same three-pin BMS handshake with the Exynos and Snapdragon charge controllers used across the S3 line.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through the S3 charge IC and confirmed BMS communication was accepted on first insertion — charge current ramped to CC phase without a BMS rejection error or trickle-lock state.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    On first installation, run one full discharge to automatic shutdown, then charge uninterrupted to 100% before resuming normal use. This gives the coulomb counter a full reference cycle against the new cell's discharge curve before the OS starts reporting state-of-charge.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Galaxy S3 reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe S3 uses a coulomb counter that was calibrated to the original cell's internal resistance and discharge curve over hundreds of cycles. When you drop in a fresh cell with lower impedance, the counter is still using the old curve as its reference. This causes the OS to misread state-of-charge — commonly showing 100% that drops to 80% in minutes, or stalling at a fixed percentage for extended periods. One complete uninterrupted discharge-to-shutdown followed by a full charge resets the calibration baseline.\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 symptom, not a capacity problem. When the modem fires during a call or the screen backlight peaks, current draw spikes and the cell voltage momentarily drops below the BMS cutoff threshold — even if the fuel gauge still shows charge remaining. On a freshly installed cell before calibration, the BMS cutoff is set conservatively at around 3.4V under load. Run the full recalibration cycle first; if shutdowns continue after that, check that the battery contacts on the chassis are clean and making full contact, since partial contact increases resistance and deepens the voltage sag.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43404326764634,"sku":"BWCS-SMI930XL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43404326797402,"sku":"BWCS-SMI930XL-2","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43404326830170,"sku":"BWCS-SMI930XL-3","price":29.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-SMI930XL-1.webp?v=1779369859","url":"https:\/\/batteryweb.com\/products\/uscellular-galaxy-s3-replacement-battery-38v-2100mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}