{"product_id":"hagenuk-e62-replacement-battery-37v-1000mah-li-ion","title":"Hagenuk E62 Replacement Battery 3.7V 1000mAh Li-ion","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eHagenuk E62 — 3.7V Li-ion Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 1000mAh Li-ion cell for the Hagenuk E62 mobile phone. It fits the E62 directly and restores power to a handset where the original cell has degraded. Dimensions are 54.61 × 35.16 × 5.31mm — measure your existing cell before ordering.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eE62 fit:\u003c\/strong\u003e\n    The E62 uses a slim removable cell at this voltage rail. The connector orientation and physical footprint match the original slot. No modification needed to seat the cell.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through a full discharge and charge sequence and monitored the BMS cutoff thresholds. The protection circuit tripped correctly at both over-voltage and under-voltage limits.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    After fitting this cell, let the phone discharge fully to auto-off, then charge uninterrupted to 100% before normal use. The E62's fuel gauge IC was calibrated to the old cell's discharge curve — one complete cycle resets it against the new cell.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the E62 reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe E62 uses a fuel gauge IC that tracks charge state by learning the cell's discharge curve over time. When you fit a new cell, the IC still references the old degraded curve. This causes the percentage readout to be inaccurate — often reading higher than actual charge state. One full discharge-to-zero and uninterrupted charge-to-100% cycle forces the IC to remap against the new cell's actual capacity.\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 — a behaviour called a voltage cliff. Even though the fuel gauge shows 20–30% remaining, the cell cannot sustain the voltage the phone needs when the screen and radio draw current simultaneously. The BMS reads this as a fault condition and cuts power before the gauge catches up. If shutdowns occur consistently in this range, run two more full discharge-charge cycles so the fuel gauge IC can accurately track where the real voltage cliff sits on this cell.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43405071646810,"sku":"BWCS-WSP001SL-1","price":27.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43405071679578,"sku":"BWCS-WSP001SL-2","price":31.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43405071712346,"sku":"BWCS-WSP001SL-3","price":33.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-WSP001SL-1.webp?v=1779369934","url":"https:\/\/batteryweb.com\/products\/hagenuk-e62-replacement-battery-37v-1000mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}