{"product_id":"esia-qwerty-mini-replacement-battery-37v-880mah-li-ion","title":"ESIA Qwerty Mini 3.7V 880mAh Replacement Battery Li-ion","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eESIA Qwerty Mini — 3.7V Li-ion Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V Li-ion cell rated at 880mAh (3.26Wh), built to fit the ESIA Qwerty Mini compact smartphone. It replaces the original cell when capacity has degraded or the battery no longer holds a usable charge. Dimensions are 44.00 × 38.00 × 5.20mm — verify these against your existing cell before fitting.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eQwerty Mini fit:\u003c\/strong\u003e\n    The Qwerty Mini uses a removable battery bay with a fixed contact layout. This cell matches that footprint and connector alignment. No OEM part number was published for this model, so physical dimensions are the primary compatibility check.\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, monitoring BMS cutoff thresholds at both ends. The protection circuit held low-voltage cutoff correctly and accepted a full charge without thermal event.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first cycle:\u003c\/strong\u003e\n    On first use after installation, disable fast charging and run one complete discharge-charge cycle at standard rate. The fuel gauge IC on the Qwerty Mini is calibrated to the original cell's discharge curve — a full slow cycle lets it map the new cell before normal charging resumes.\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 replacement cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens because the fuel gauge IC still holds the old cell's discharge curve in memory. When the new cell hits a voltage point the gauge hasn't mapped yet, the phone sees an unexpected voltage drop under screen or modem load and triggers a protective shutdown. The percentage shown is wrong — the cell is actually closer to empty than the OS thinks. One full discharge-charge cycle at standard rate forces the coulomb counter to rebuild its curve against the new cell. After that cycle, shutdowns at 20–30% typically stop.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003ePhone won't power on after the replacement cell sat in storage\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-ion cells self-discharge during storage. If this cell dropped below 2.5V per cell while sitting unused, the BMS enters a lockout state and blocks normal charge current to prevent damage to a deeply discharged cell. The phone shows nothing when you press the power button — no logo, no charging indicator. Connect to a charger and leave it for 15–20 minutes without pressing anything; most BMS circuits on this cell class use a trickle pre-charge mode that slowly brings voltage above the lockout threshold before allowing full charge current. If the screen shows a charging indicator after that wait, the BMS has recovered — continue charging to 100% before first use.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43405078429786,"sku":"BWCS-HUV860SL-1","price":22.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43405078462554,"sku":"BWCS-HUV860SL-2","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43405078495322,"sku":"BWCS-HUV860SL-3","price":27.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-HUV860SL-1.webp?v=1779369919","url":"https:\/\/batteryweb.com\/products\/esia-qwerty-mini-replacement-battery-37v-880mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}