{"product_id":"sprint-admiral-replacement-battery-37v-1300mah-li-ion","title":"Sprint ADMIRAL 3.7V Replacement Battery 1300mAh Li-ion","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSprint Admiral — 3.7V Li-ion Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V, 1300mAh Li-ion battery replaces the original cell in the Sprint Admiral smartphone. It fits the Admiral's battery bay directly and restores power to calls, messaging, and apps. Capacity is 4.81Wh — matched to the original specification.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eAdmiral battery bay fit:\u003c\/strong\u003e\n    The Sprint Admiral uses a removable 3.7V single-cell Li-ion pack. This replacement matches the original cell's voltage rail and physical footprint at 49.95 × 45.50 × 5.70mm, so the rear cover seats flush 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 charge and discharge on the bench. The BMS held cutoff at the correct low-voltage threshold and accepted charge current without tripping protection prematurely. Capacity output tracked within normal tolerance of the 1300mAh rating.\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 and run one complete discharge-to-charge cycle before resuming normal use. The Admiral's fuel gauge IC is calibrated to the old cell's discharge curve — letting it complete one full cycle against the new cell gives it the data it needs to report accurate percentages.\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 is a voltage cliff problem, not a capacity problem. Under modem load or screen-on draw, the new cell's terminal voltage drops faster than the fuel gauge IC expects — because the IC is still using the discharge curve it learned from the old, degraded cell. When voltage sags below the shutdown threshold, the phone cuts power even though the displayed percentage still reads 20–30%. One full discharge cycle — draining to automatic shutoff, then charging uninterrupted to 100% — lets the coulomb counter recalibrate against the new cell's actual curve. After that cycle, percentage readings stabilise and premature shutdowns stop.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003ePhone will not power on after the battery sat in storage\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-ion cells self-discharge during storage. If a cell drops below approximately 2.5V, the BMS locks out to prevent damage and the phone will not respond to a normal power-on attempt. Connect the Admiral to its charger and leave it for 15–30 minutes without pressing the power button — the charger applies a trickle current that brings the cell back above the BMS re-enable threshold. Once the charge LED activates or the boot screen appears, the BMS has unlocked and normal charging can resume.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43405134987354,"sku":"BWCS-MOA855SL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43405135020122,"sku":"BWCS-MOA855SL-2","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43405135052890,"sku":"BWCS-MOA855SL-3","price":28.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-MOA855SL-1.webp?v=1779370263","url":"https:\/\/batteryweb.com\/products\/sprint-admiral-replacement-battery-37v-1300mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}