{"product_id":"elson-el350-replacement-battery-37v-1200mah-li-ion","title":"Elson EL350 Replacement Battery BTY26169 3.7V 1200mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eElson EL350 \/ EL350 Dual — 3.7V Li-ion Replacement Battery (BTY26169)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 1200mAh Li-ion replacement battery for the Elson EL350 and EL350 Dual smartphones. It replaces OEM part BTY26169 and fits both single-SIM and dual-SIM variants of the EL350. Capacity is 1200mAh (4.44Wh), matching the original cell specification.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eEL350 and EL350 Dual compatibility:\u003c\/strong\u003e\n    Both variants use the same physical cell format, connector pinout, and BMS communication protocol. The dual-SIM model draws slightly more standby current from two active radio stacks, but the battery interface and charge circuit are identical across both.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through the EL350 charge IC and confirmed the BMS handshake completes correctly. The protection circuit trips at the expected low-voltage threshold and the charge controller reaches termination without errors.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    On first use after installation, disable fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC map its coulomb counter against the new cell's actual discharge curve before high-current charging is applied to an uncalibrated cell.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSudden shutdown at 20–30% on the EL350 after a cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe EL350's fuel gauge IC stores a learned discharge curve from the previous cell. When a new cell is installed, the stored curve no longer matches the actual voltage-to-capacity relationship of the replacement. Under load spikes — screen brightness peak, modem handoff, or dual-SIM radio switching — the new cell's voltage drops faster than the gauge predicts, and the BMS cuts power before the displayed percentage reaches zero. One full discharge-charge cycle without fast charging resets the coulomb counter and recalibrates the gauge to the new cell.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003ePhone won't power on after the replacement battery sat in storage\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-ion cells self-discharge during storage. If the replacement cell dropped below approximately 2.5V per cell before installation, the BMS enters lockout mode and blocks current flow to protect the cell from damage. The EL350 will show no response — no boot logo, no charge indicator. Connect the phone to a wall charger and leave it for 15–20 minutes without pressing the power button; the charge IC trickle-charges the cell back above the BMS re-enable threshold, typically around 2.9V, after which normal charging resumes.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43404343476314,"sku":"BWCS-MEL350XL-1","price":22.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43404343509082,"sku":"BWCS-MEL350XL-2","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43404343541850,"sku":"BWCS-MEL350XL-3","price":27.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-MEL350XL-1.webp?v=1779369806","url":"https:\/\/batteryweb.com\/products\/elson-el350-replacement-battery-37v-1200mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}