{"product_id":"emporia-prime-replacement-battery-37v-950mah-li-ion","title":"AK-V500 Emporia Prime Replacement Battery 3.7V 950mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eEmporia Prime V500 Series — 3.7V Li-ion Replacement Battery (AK-V500)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 950mAh Li-ion replacement battery for the Emporia Prime flip phone, including the Prime V500 and Prime V500.3G. It replaces the original AK-V500 cell when the factory battery no longer holds charge or fails to power the device.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePrime V500 and V500.3G compatibility:\u003c\/strong\u003e\n    Both variants run the same 3.7V single-cell architecture with identical connector pinout and BMS handshake. One cell fits both builds without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through a full charge and discharge cycle on a Prime V500.3G unit. The BMS accepted the cell without fault codes, and the charge IC ramped to full current within the first few minutes of the initial charge.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    After fitting this cell, disable fast charging if available and let the phone complete one full discharge-to-charge cycle before resuming normal use. This gives the fuel gauge IC time to map the new cell's discharge curve accurately before high-current charging pushes current into an uncalibrated state.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Emporia Prime reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe Prime's fuel gauge IC stores a learned discharge curve from the original cell. When you fit a new cell, that stored curve no longer matches the new cell's actual voltage-to-capacity relationship. The gauge reads voltage and maps it against old data, so it reports incorrect percentages — often too high early in discharge and then dropping suddenly. One complete discharge cycle, down to automatic shutdown and back to 100%, forces the IC to relearn the curve against the new cell.\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 the combined load of the 3G modem and screen — a voltage cliff the fuel gauge did not predict. The BMS triggers a hard cutoff before the displayed percentage reaches zero. It is not a faulty cell; it is an uncalibrated gauge reading a flat part of the discharge curve as if it were mid-charge. Run one full discharge cycle to let the coulomb counter reset, then charge back to 4.2V before normal use.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43391891505242,"sku":"BWCS-EAV500SL-1","price":27.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43391891538010,"sku":"BWCS-EAV500SL-2","price":31.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43391891570778,"sku":"BWCS-EAV500SL-3","price":34.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-EAV500SL-1.webp?v=1779142541","url":"https:\/\/batteryweb.com\/products\/emporia-prime-replacement-battery-37v-950mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}