{"product_id":"samsung-sgh-a300-replacement-battery-37v-700mah-li-ion","title":"Samsung SGH-A300 Replacement Battery 3.7V 700mAh Li-ion","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSamsung SGH-A300 \/ SGH-K200 — 3.7V Li-ion Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 700mAh Li-ion cell for the Samsung SGH-A300, SGH-A388, SGH-K200, and SCH-302 candybar mobile phones. It fits the original battery bay without modification. Use it when the existing cell no longer holds charge through a standard day of calls and texts.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSGH-A300 \/ SGH-K200 compatibility:\u003c\/strong\u003e\n    These models share the same 3.7V single-cell architecture and battery connector pinout. The charge IC in each handset expects the same voltage window — 3.0V cutoff at the low end, 4.2V at full charge — so one cell design covers the full fit list.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell on the SGH-A300 platform, confirmed the BMS accepted charge without fault flags, and verified the protection circuit tripped correctly at the low-voltage cutoff before the board could draw the cell below 3.0V.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first install:\u003c\/strong\u003e\n    After fitting this cell, run one complete discharge down to automatic shutdown, then charge uninterrupted to 100%. The phone's fuel gauge IC was calibrated to the original cell's discharge curve — that single full cycle resets it to the new cell and stops erratic percentage readings.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the SGH-A300 reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe SGH-A300 uses a fuel gauge IC that tracks charge by measuring voltage against a stored discharge curve from the original cell. A new cell has a slightly different internal resistance and voltage-versus-capacity profile. Until the IC maps one full discharge cycle against the new cell, it interpolates from the old curve and reads inaccurately. One uninterrupted discharge-to-shutdown followed by a full charge corrects this.\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 call or sustained screen use — faster than the fuel gauge IC expects. The phone reads 25% on the display but the cell is already near the 3.0V protection floor, triggering an immediate shutdown. It is a gauge calibration issue, not a faulty cell. Run one full discharge cycle to shutdown and recharge to 100%; the IC recalibrates its curve and the shutdowns stop.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43409461182554,"sku":"BWCS-SMA300SL-1","price":21.99,"currency_code":"USD","in_stock":false},{"title":"Warranty 2 Year","offer_id":43409461215322,"sku":"BWCS-SMA300SL-2","price":24.99,"currency_code":"USD","in_stock":false},{"title":"Warranty 3 Year","offer_id":43409461248090,"sku":"BWCS-SMA300SL-3","price":26.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-SMA300SL-big.webp?v=1779579784","url":"https:\/\/batteryweb.com\/products\/samsung-sgh-a300-replacement-battery-37v-700mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}