{"product_id":"samsung-gt-i9300-replacement-battery-38v-2100mah-li-ion","title":"Samsung Galaxy S III Replacement Battery EB-L1G6LLUC 3.8V 2100mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSamsung Galaxy S III GT-I9300 — 3.8V Li-ion Replacement Battery (EB-L1G6LLUC)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.8V, 2100mAh Li-ion cell replaces the original battery in the Samsung Galaxy S III and its variants, including the GT-I9300, GT-I9308, and SHW-M440S. It matches the OEM voltage rail and physical dimensions (63.20 × 50.40 × 5.40mm) for a correct fit under the rear cover. Capacity is 2100mAh — 7.98Wh — matching the factory specification.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eGT-I9300 and variant compatibility:\u003c\/strong\u003e\n    The GT-I9300, GT-I9308, SHW-M440S, and Galaxy S III LTE share the same battery bay dimensions, 3.8V supply rail, and connector pinout. All run off the same EB-L1G6LLUC cell specification, so one part number covers the platform.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell on a GT-I9300 unit and monitored BMS cutoff behaviour through charge termination. The protection circuit tripped correctly at the 4.2V upper limit and held low-voltage cutoff at 3.0V without false trips during modem-load spikes.\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 run one complete discharge-to-charge cycle before normal use. The Galaxy S III's fuel gauge IC is calibrated against the old cell's discharge curve — one full cycle lets it re-map against the new cell before resuming high-current input.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the GT-I9300 reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe Galaxy S III uses a coulomb-counter fuel gauge IC that builds its capacity model from previous charge-discharge data. When the cell is swapped, the IC carries over the old cell's learned curve. The displayed percentage drifts from actual state-of-charge because the IC is referencing voltage-to-capacity mapping that no longer matches the new cell. One full discharge to automatic shutdown, followed by a full charge to 100%, forces the IC to rewrite its reference table against the replacement cell.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSudden shutdown at 20–30% battery remaining on the replacement cell\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThis is a voltage-cliff failure, not a capacity problem. Under combined modem, display, and processor load, cell voltage sags sharply below what the fuel gauge predicted at that state-of-charge. The phone's protection circuit triggers shutdown before the displayed percentage reaches zero. The fix is the same calibration cycle — one full drain and charge — so the fuel gauge IC learns the actual voltage sag curve of the new cell. After calibration, shutdowns before 15% should stop.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43405017284698,"sku":"BWCS-SMI930XL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43405017317466,"sku":"BWCS-SMI930XL-2","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43405017350234,"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\/samsung-gt-i9300-replacement-battery-38v-2100mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}