{"product_id":"sprint-photon-replacement-battery-37v-1500mah-li-ion","title":"Sprint Photon 3.7V 1500mAh Compatible Battery Li-ion","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSprint Photon — 3.7V Li-ion 1500mAh Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V 1500mAh Li-ion cell is a direct swap for the Sprint Photon smartphone battery. It fits the Photon's internal battery bay and connects to the device's charge and fuel gauge circuitry. Capacity is rated at 1500mAh (5.55Wh) — that figure comes from the cell specification, not an estimate.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSprint Photon compatibility:\u003c\/strong\u003e\n    The Photon uses a flat Li-ion cell with a three-pin connector carrying power, ground, and a thermistor line for thermal monitoring. This cell matches that pinout and the 60.50 × 42.00 × 4.50mm bay dimensions exactly.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran full charge and discharge cycles on the Photon platform. The BMS accepted the cell without fault flags, and the charge IC stepped through CC\/CV phases cleanly from a depleted state.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first install:\u003c\/strong\u003e\n    On first use after installation, disable fast charging and run one complete discharge-charge cycle. This allows the fuel gauge IC to recalibrate its coulomb counter against the new cell's actual discharge curve before high-current charging begins.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Photon reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Photon's fuel gauge IC stores a learned discharge curve from the original cell. When a new cell goes in, the IC still references that old curve. The percentage reading drifts because the coulomb counter is measuring against data that no longer matches the new cell's characteristics. One full discharge to auto-off followed by a complete charge cycle resets the learned curve and brings the percentage display back in line.\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 combined modem and screen load — a voltage cliff the fuel gauge didn't predict because it hadn't finished recalibrating. The Photon's modem radio draws a burst of current that a freshly installed, uncalibrated cell can't sustain at that state of charge, triggering an undervoltage shutdown. The fix is the same recalibration cycle: one full drain to zero, then charge uninterrupted to 100%. After that cycle, the fuel gauge maps the cliff accurately and the OS receives correct cutoff warnings before the shutdown point.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43405073842266,"sku":"BWCS-MOB855SL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43405073875034,"sku":"BWCS-MOB855SL-2","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43405073907802,"sku":"BWCS-MOB855SL-3","price":28.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-MOB855SL-1.webp?v=1779369920","url":"https:\/\/batteryweb.com\/products\/sprint-photon-replacement-battery-37v-1500mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}