{"product_id":"highscreen-zera-s-replacement-battery-37v-1450mah-li-ion","title":"Highscreen Zera S 3.7V 1450mAh Replacement Battery","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eHighscreen Zera S — 3.7V Li-ion Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 1450mAh Li-ion cell for the Highscreen Zera S smartphone. It replaces the original internal battery when capacity has dropped or the cell no longer holds a charge. At 5.37Wh, it matches the factory specification for this compact device.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eZera S fitment:\u003c\/strong\u003e\n    The Zera S uses a slim, fixed internal cell at 3.7V nominal. At 62.00 × 56.95 × 4.40mm, this replacement matches the original footprint so the back cover seats correctly and the connector aligns with the board header without modification.\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 and confirmed the BMS communicates charge status correctly with the device. The protection circuit trips as expected under overcurrent and reconnects cleanly.\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 build an accurate discharge curve for the new cell before any high-current charging pushes power into an uncalibrated state.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Zera S reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe fuel gauge IC on the Zera S stores a learned discharge curve for the original cell. When a new cell goes in, that stored curve no longer matches the actual chemistry and impedance of the replacement. The IC keeps reading against old data, so the percentage shown on screen drifts from reality — often reading high until voltage drops suddenly. One full discharge to auto-off followed by a full charge to 100% resets the coulomb counter and lets the IC build a fresh 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 modem, screen, or processor draws a short burst of current that the cell cannot sustain at its present state of charge. Voltage dips below the shutdown threshold faster than the fuel gauge IC can update the percentage reading, so the phone cuts off before the display hits zero. The cell is not faulty — it is the IC still running an uncalibrated curve. Run one full cycle from 100% down to auto-off shutdown, then charge uninterrupted to 100%, and the threshold drift corrects.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43404131336282,"sku":"BWCS-AVS451SL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43404131369050,"sku":"BWCS-AVS451SL-2","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43404131401818,"sku":"BWCS-AVS451SL-3","price":28.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-AVS451SL-1.webp?v=1779369036","url":"https:\/\/batteryweb.com\/products\/highscreen-zera-s-replacement-battery-37v-1450mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}