{"product_id":"att-galaxy-s-iii-replacement-battery-37v-1400mah-li-ion","title":"AT\u0026T Galaxy S III Replacement Battery 3.7V 1400mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eAT\u0026amp;T Galaxy S III — 3.7V Li-ion Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 1400mAh Li-ion replacement battery for the AT\u0026amp;T Samsung Galaxy S III (Galaxy S3 \/ SIII). It fits the standard battery slot on these models and restores power to the display, processor, and wireless radios. Dimensions are 63.00 x 50.40 x 5.40mm — verify against your original cell before installing.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eGalaxy S III compatibility:\u003c\/strong\u003e\n    The AT\u0026amp;T Galaxy S III, S3, and SIII variants all share the same battery bay dimensions, contact pin layout, and 3.7V nominal voltage rail. One replacement cell covers the full group.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through charge and discharge cycles on Galaxy S III hardware. The BMS accepted the charge IC handshake cleanly, and the protection circuit tripped correctly at low-voltage cutoff without nuisance trips during normal screen and modem load.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    After installing this cell, disable fast charging and complete one full discharge-charge cycle before normal use. This gives the phone's fuel gauge IC time to map the new cell's discharge curve — without that cycle, the coulomb counter is still calibrated to the old, degraded cell and percentage readings will be unreliable.\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 replacement cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis is a voltage cliff problem, not a capacity problem. Under high-current draw — LTE radio, screen-on navigation, or a GPU-intensive app — cell voltage drops sharply below what the fuel gauge IC predicted. The phone's protection circuit reads undervoltage and cuts power before the displayed percentage hits zero. One full discharge-charge cycle lets the fuel gauge IC relearn where the new cell's voltage actually collapses under load. After calibration, shutdowns at 20–30% typically stop.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003ePhone reports wrong battery percentage after cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Galaxy S III uses a coulomb counter that accumulates charge and discharge data over time. When you install a new cell, that counter still holds the curve from the old degraded battery. The mismatch causes the OS to display percentages that are 10–20% off real capacity — or to jump erratically between readings. Fix this by running one complete discharge down to auto-shutdown, then charging uninterrupted to 100%. That single cycle resets the fuel gauge IC against the actual capacity of the new cell.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43405019840602,"sku":"BWCS-SMI930SL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43405019873370,"sku":"BWCS-SMI930SL-2","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43405019906138,"sku":"BWCS-SMI930SL-3","price":28.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-SMI930SL-1.webp?v=1779369859","url":"https:\/\/batteryweb.com\/products\/att-galaxy-s-iii-replacement-battery-37v-1400mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}