{"product_id":"vibo-a688-replacement-battery-37v-1100mah-li-ion","title":"VIBO A688 Replacement Battery 3.7V 1100mAh Li-ion","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eVIBO A688 — 3.7V Li-ion Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V 1100mAh Li-ion cell built to replace the original battery in the VIBO A688 smartphone. It fits the A688 directly, restoring power to a phone that no longer holds a charge or fails to power on. Capacity is 1100mAh (4.07Wh), matching the original cell specification.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eA688 fit notes:\u003c\/strong\u003e\n    The A688 uses a compact 46.00 x 40.10 x 6.30mm cell with a direct connector tab. This replacement matches those dimensions exactly, so the battery seats flush without pressure on the rear housing.\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 on the bench. The BMS accepted charge input without tripping, and the protection circuit responded correctly to over-discharge cutoff near 2.5V.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first install:\u003c\/strong\u003e\n    After fitting this cell, disable fast charging for the first complete discharge-charge cycle. The fuel gauge IC in the A688 was calibrated to the old cell's discharge curve — running one slow cycle lets it map the new curve before high-current charging begins.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the A688 reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe A688 uses a fuel gauge IC that tracks charge state by measuring voltage and current over time against a stored discharge curve. When you install a new cell, that stored curve no longer matches the physical cell in the device. The gauge reads voltage accurately but maps it to the wrong state-of-charge percentage. One full slow discharge to 3.2V followed by a complete charge cycle forces the IC to re-anchor its calibration to the new cell.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSudden shutdown at 20–30% remaining on the replacement cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the cell voltage drops sharply under load — typically during a call, screen-on burst, or GPS fix — faster than the fuel gauge predicts. The phone's low-voltage protection cuts power before the displayed percentage reaches zero. It is not a faulty battery; it is the gauge reading a voltage cliff it has not yet learned. Run two full discharge-charge cycles without fast charging, then check whether the shutdowns persist. If the phone still cuts out, charge to 100% and verify the resting cell voltage sits above 4.1V before discharge begins.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43409489461338,"sku":"BWCS-NK6FSL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43409489494106,"sku":"BWCS-NK6FSL-2","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43409489526874,"sku":"BWCS-NK6FSL-3","price":28.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-NK6FSL-1.webp?v=1779579815","url":"https:\/\/batteryweb.com\/products\/vibo-a688-replacement-battery-37v-1100mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}