{"product_id":"emporia-el550-replacement-battery-37v-550mah-li-ion","title":"Emporia EL550 Replacement Battery BTY26166 3.7V 550mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eEmporia EL550 — 3.7V Li-ion Replacement Battery (BTY26166)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V, 550mAh Li-ion cell is a direct replacement for the Emporia EL550 mobile phone. It slots into the same battery bay as the original BTY26166 and restores power to a phone that no longer holds a charge or fails to boot. Dimensions are 39.40 × 38.90 × 4.36mm — measure your existing cell before ordering if you are unsure.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eEL550 battery bay fit:\u003c\/strong\u003e\n    The EL550 uses a compact removable cell format at 3.7V nominal. This replacement matches the original voltage rail and connector orientation, so the phone's charge IC sees the new cell without a pinout mismatch.\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 accepted a standard charge curve without tripping into protection mode, and the cell held voltage within spec across the discharge sweep.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    On first use after installation, run one full discharge down to auto-shutdown, then charge uninterrupted to 100%. This gives the EL550's fuel gauge IC a reference discharge curve for the new cell — skip this step and the percentage readout will drift from the first day.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the EL550 reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe EL550'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 actual cell behaviour. The gauge reads percentage against old data, so it can show 40% and drop to shutdown moments later. One complete uninterrupted discharge-to-charge cycle overwrites the old curve with data from the new cell. After that cycle, percentage readings stabilise.\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\"\u003eA 550mAh cell at this capacity is operating close to its voltage cliff under modem and screen load. When the EL550 pulls current for a call or display wake, the cell voltage sags sharply — the BMS reads that sag as undervoltage and cuts output before the gauge reaches 0%. This is not a faulty cell; it is the protection circuit doing its job on a high-impedance load spike. Confirm this is the cause by checking that the phone restarts normally after the shutdown — if it does, the BMS tripped, not the cell. Reduce screen brightness and mobile data activity to flatten the load curve.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43405056639066,"sku":"BWCS-MEL550SL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43405056671834,"sku":"BWCS-MEL550SL-2","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43405056704602,"sku":"BWCS-MEL550SL-3","price":28.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-MEL550SL-1.webp?v=1779369883","url":"https:\/\/batteryweb.com\/products\/emporia-el550-replacement-battery-37v-550mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}