{"product_id":"samsung-stratosphere-i405-replacement-battery-37v-1850mah-li-ion","title":"Samsung Stratosphere i405 Replacement Battery EB505165YZ 3.7V 1850mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSamsung Stratosphere i405 — 3.7V Li-ion Replacement Battery (EB505165YZ)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 1850mAh Li-ion cell that replaces the original EB505165YZ battery in the Samsung Stratosphere i405 slider smartphone. It fits the SCH-i405, SCH-i405U, and Stratosphere 4G variants. The battery slots into the rear compartment and connects via the original three-contact terminal.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eStratosphere i405 and SCH-i405U compatibility:\u003c\/strong\u003e\n    These variants share the same battery bay dimensions, connector pitch, and 3.7V nominal voltage rail. The BMS handshake on each model communicates through the same three-pin arrangement, so one cell covers the full range without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through full charge and discharge on the SCH-i405 platform. The BMS accepted the cell without triggering thermal cutoff or an authentication fault, and charge termination occurred cleanly at 4.2V.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    After installation, run one complete discharge down to automatic shutdown, then charge uninterrupted to 100% before using the phone normally. The Stratosphere's fuel gauge IC maps its coulomb counter to the new cell's discharge curve during this first full cycle — skipping it causes the percentage readout to drift.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Stratosphere i405 reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe i405 uses a fuel gauge IC that builds its charge model from the discharge curve of whichever cell was last fully cycled. When a new cell goes in, the IC still references the old cell's curve — which has different internal resistance and capacity characteristics. The percentage display drifts or stalls because the coulomb counter is feeding data into the wrong model. One complete discharge-to-shutdown cycle followed by an uninterrupted full charge forces the IC to rebuild its reference curve against the new cell. After that single cycle, percentage reporting stabilises.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSudden shutdown at 20–30% on the replacement cell\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the modem radio or screen backlight draws a current spike that the cell cannot sustain at that state of charge — the terminal voltage collapses below the BMS cutoff threshold momentarily, and the phone shuts down even though the gauge shows charge remaining. It is a voltage-sag symptom, not a capacity fault. A cell that has not been calibrated amplifies the problem because the gauge allows discharge into a voltage range where sag becomes severe. Run the fuel gauge calibration cycle first; if shutdowns continue, check that terminal voltage under load stays above 3.4V using a battery tester before reinstalling.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43404236685402,"sku":"BWCS-SMI405XL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43404236718170,"sku":"BWCS-SMI405XL-2","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43404236750938,"sku":"BWCS-SMI405XL-3","price":29.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-SMI405XL-1.webp?v=1779369464","url":"https:\/\/batteryweb.com\/products\/samsung-stratosphere-i405-replacement-battery-37v-1850mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}