{"product_id":"sprint-replacement-battery-37v-2800mah-li-ion","title":"Sprint BA S390 Smartphone Replacement Battery 3.7V 2800mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSprint BA S390 — 3.7V Li-ion Replacement Battery (BA S390)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 2800mAh Li-ion cell that replaces the original BA S390 battery in compatible Sprint smartphones. It also cross-references OEM part numbers RHOD160, 35H00123-00M, and 35H00123-02M. If your original cell no longer holds a charge or fails to power the device, this is a direct swap at matching voltage and capacity.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eCross-reference coverage:\u003c\/strong\u003e\n    The BA S390, RHOD160, 35H00123-00M, and 35H00123-02M part numbers share the same voltage rail and physical connector. One replacement cell covers all four part numbers without any modification to the battery bay or contacts.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through full charge and load cycles, verifying BMS cutoff thresholds and charge acceptance at 3.7V nominal. The protection circuit responded correctly to overcharge and over-discharge limits throughout testing.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    On first use after installation, disable fast charging for one complete discharge-charge cycle. This gives the fuel gauge IC time to map the new cell's discharge curve before high-current charging pushes current into an uncalibrated cell — preventing erratic percentage readings from the first charge onward.\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 happens because the fuel gauge IC is still using the discharge curve from the old, degraded cell. When the screen or modem draws a spike of current, the new cell's voltage drops sharply in a region the gauge hasn't mapped yet. The phone interprets that voltage dip as a dead battery and shuts down, even though capacity remains. One full discharge-to-cutoff followed by a complete charge cycle forces the coulomb counter to recalibrate against the actual cell curve and eliminates most of these premature shutdowns.\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 fuel gauge IC stores a learned model of the old cell's impedance and discharge profile. A new cell has different internal resistance, so the stored model produces inaccurate state-of-charge readings — the percentage displayed can jump, stall, or read high while the device is already in low-voltage territory. Drain the battery fully until the phone shuts itself off, then charge uninterrupted to 100% without removing the cable. After one complete cycle, the gauge IC updates its reference curve and percentage accuracy stabilises.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43405143015514,"sku":"BWCS-HDP180HL-1","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43405143048282,"sku":"BWCS-HDP180HL-2","price":29.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43405143081050,"sku":"BWCS-HDP180HL-3","price":32.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-HDP180HL-1.webp?v=1779370263","url":"https:\/\/batteryweb.com\/products\/sprint-replacement-battery-37v-2800mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}