{"product_id":"evolveo-easyphone-ep-500-replacement-battery-37v-1200mah-li-ion","title":"Evolveo EasyPhone EP-500 Replacement Battery 3.7V 1200mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eEvolveo EasyPhone EP-500 — 3.7V Li-ion Replacement Battery (EP-500)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 1200mAh Li-ion cell for the Evolveo EasyPhone EP-500 — a compact feature-adjacent phone built for calls and messaging. It replaces the original battery when capacity has faded or the cell no longer holds charge. Dimensions are 53.00 × 33.90 × 5.70mm, matching the original battery bay.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eEasyPhone EP-500 fitment:\u003c\/strong\u003e\n    The EP-500 uses a removable battery with a fixed connector orientation and a shallow bay depth of 5.70mm. This cell matches that physical envelope and the 3.7V nominal rail the phone's charge IC expects.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through full charge and discharge on the EP-500 platform. The BMS held cutoff correctly at both ends — no false-full stops and no undervoltage lockout during normal discharge.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle fuel gauge reset:\u003c\/strong\u003e\n    After installing a new cell, run one complete discharge down to automatic shutdown and then charge uninterrupted to 100% before using the phone normally. This gives the fuel gauge IC a clean reference curve for the new cell's actual capacity.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the EP-500 reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe EP-500 uses a fuel gauge IC that builds its charge estimates from the discharge curve of the previous cell. When you fit a new cell, the IC still references the old curve until it sees one full cycle. Until then, the displayed percentage drifts — often reading 15–20% higher than actual charge state. One complete discharge-to-shutdown followed by a full uninterrupted charge resets the coulomb counter and aligns the gauge to the new cell's actual 1200mAh curve.\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 load — typically when the modem transmits or the screen backlight peaks — pulling the cell below the BMS cutoff threshold even though the gauge still shows charge remaining. It is a voltage-cliff failure: the cell cannot sustain the required voltage under instantaneous current demand. A fresh cell out of storage may sit near this cliff if it has partially self-discharged. Charge the battery fully to 4.2V before first use and run the fuel gauge calibration cycle to push the shutdown point back to the correct low-voltage floor.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43404142575706,"sku":"BWCS-AVC120SL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43404142608474,"sku":"BWCS-AVC120SL-2","price":27.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43404142641242,"sku":"BWCS-AVC120SL-3","price":29.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-AVC120SL-1.webp?v=1779369080","url":"https:\/\/batteryweb.com\/products\/evolveo-easyphone-ep-500-replacement-battery-37v-1200mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}