{"product_id":"samsung-sgh-s300-replacement-battery-37v-850mah-li-ion","title":"Samsung SGH-S300 Replacement Battery BST1318SE 3.7V 850mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSamsung SGH-S300 Series — 3.7V Li-ion Replacement Battery (BST1318SE)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 850mAh Li-ion replacement battery for the Samsung SGH-S300, SGH-S307, and SGH-S308 mobile phones. It replaces OEM part numbers BST1318SE, BSL1315LE, and BST1318DE. If the original cell has degraded, swollen, or stopped holding a charge, this unit restores power to the handset.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSGH-S300 \/ S307 \/ S308 compatibility:\u003c\/strong\u003e\n    All three models share the same battery bay dimensions, 3.7V nominal rail, and connector pinout — the same cell fits all without modification to contacts or housing.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through charge and discharge on the SGH-S300 platform. The BMS accepted charging without tripping overcurrent protection, and voltage held steady through full discharge without an early cutoff event.\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 down to auto-shutdown, then charge uninterrupted to 100%. The SGH-S300's fuel gauge IC is calibrated to the original cell's discharge curve — one complete cycle resets the coulomb counter against the new cell's actual capacity.\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 SGH-S300 after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens because the phone's fuel gauge IC still references the discharge curve of the old, degraded cell. The new cell has a steeper voltage cliff at low state-of-charge — the phone's power IC sees terminal voltage drop below its cutoff threshold before the percentage counter reaches zero. It is not a fault with the replacement cell. One full discharge-charge cycle gives the coulomb counter enough data to remap the curve against the new cell, and the shutdowns stop.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003ePhone not powering on after the replacement battery sat in storage\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-ion cells self-discharge in storage. If the cell voltage has dropped below approximately 2.5V, the BMS trips its deep-discharge lockout and blocks current flow to protect the cell from damage. The phone will show no response — no boot screen, no charging indicator. Connect the handset to a charger and leave it for 15–20 minutes without attempting to power it on. Once the BMS detects voltage has recovered above its reinitialisation threshold, the charging indicator will appear and normal operation resumes.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43409459773530,"sku":"BWCS-SMS300SL-1","price":22.99,"currency_code":"USD","in_stock":false},{"title":"Warranty 2 Year","offer_id":43409459806298,"sku":"BWCS-SMS300SL-2","price":25.99,"currency_code":"USD","in_stock":false},{"title":"Warranty 3 Year","offer_id":43409459839066,"sku":"BWCS-SMS300SL-3","price":27.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-SMS300SL-big.webp?v=1779579767","url":"https:\/\/batteryweb.com\/products\/samsung-sgh-s300-replacement-battery-37v-850mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}