{"product_id":"sprint-sch-m580-replacement-battery-37v-1500mah-li-ion","title":"Sprint SCH-M580 Replacement Battery 3.7V 1500mAh Li-ion","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSprint SCH-M580 \/ Replenish \/ SPH-M930 — 3.7V Li-ion Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V, 1500mAh Li-ion cell replaces the original battery in the Sprint SCH-M580, Replenish, and SPH-M930 handsets. All three share the same battery footprint, connector, and charge profile. Dimensions are 64.60 × 43.90 × 5.20mm — measure your original before fitting if unsure.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSCH-M580, Replenish, and SPH-M930 compatibility:\u003c\/strong\u003e\n    These three Sprint handsets use the same battery bay geometry and the same 3.7V charge termination voltage. One cell covers all three without any 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 SCH-M580 platform. The BMS accepted the charge handshake on the first cycle, and the protection circuit tripped correctly at the low-voltage cutoff threshold during discharge stress testing.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    Disable fast charging if your device supports it for the first full discharge-charge cycle. The fuel gauge IC on these handsets calibrates against the cell's discharge curve on that first cycle — running a high current into an uncalibrated cell causes percentage drift for weeks afterward.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the SCH-M580 reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe fuel gauge IC on this handset tracks charge state using a coulomb counter that was calibrated to the original cell's internal resistance and discharge curve. When you fit a new cell, that learned curve no longer matches the hardware. The OS reads a stale internal model and displays percentages that don't reflect actual charge. One full discharge down to auto-shutoff, followed by an uninterrupted charge to 100%, forces the IC to re-anchor its model to the new cell. After that single cycle, reported percentage 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 is a voltage cliff issue, not a capacity problem. Under modem load or screen-on bursts, a fresh cell with an uncalibrated fuel gauge can show 25% while actual terminal voltage has already dropped below the shutdown threshold. The BMS cuts power before the OS can warn you. The fix is the same: run one complete discharge-charge cycle without interruption so the coulomb counter locks onto the new cell's real voltage-to-capacity curve. If shutdowns persist past two full cycles, check that the battery contacts in the bay are clean and making solid contact — a high-resistance connection causes the same voltage sag symptom.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43405141377114,"sku":"BWCS-SMI8910SL-1","price":22.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43405141409882,"sku":"BWCS-SMI8910SL-2","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43405141442650,"sku":"BWCS-SMI8910SL-3","price":27.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-SMI8910SL-1.webp?v=1779370279","url":"https:\/\/batteryweb.com\/products\/sprint-sch-m580-replacement-battery-37v-1500mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}