{"product_id":"samsung-galaxy-a90-5g-replacement-battery-385v-4400mah-li-polymer","title":"Samsung Galaxy A90 5G EB-BA908ABY Replacement Battery 3.85V 4400mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSamsung Galaxy A90 5G — 3.85V Li-Polymer Replacement Battery (EB-BA908ABY)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.85V, 4400mAh Li-Polymer cell replaces the original battery in the Samsung Galaxy A90 5G. It fits the SM-A908, SM-A908B, and SM-A908F variants and restores capacity when the original cell has degraded past usable thresholds. Part number EB-BA908ABY confirms direct compatibility with the A90 5G battery bay and connector.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSM-A908 variant coverage:\u003c\/strong\u003e\n    The SM-A908, SM-A908B, and SM-A908F share the same battery bay dimensions, connector pinout, and BMS handshake protocol — one cell covers all three. The 78.40 × 64.65 × 4.66mm form factor matches the original housing with no 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 SM-A908 platform. The BMS accepted the charge IC handshake without error flags, and coulomb counter registration completed normally across the first full cycle.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    Disable fast charging for the first complete discharge-charge cycle after installation. The fuel gauge IC is calibrated to the old cell's discharge curve — one full slow cycle at standard charge current lets it remap against the new cell before high-current charging is applied.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the A90 5G reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe Galaxy A90 5G uses a coulomb counter inside the fuel gauge IC to estimate state of charge. That counter was calibrated against the original cell's internal resistance and discharge slope. When a new cell goes in, the stored curve no longer matches actual cell behaviour, so the percentage display reads high or low. One full discharge to auto-shutdown followed by a complete charge to 100% at standard current resets the calibration baseline.\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\"\u003eThe A90 5G's 5G modem and display draw burst current that can spike well above the steady-state load. If the fuel gauge IC has not yet recalibrated, it may show 25% while actual cell voltage has already dropped to the BMS cutoff threshold — around 3.0V under load. The BMS reads voltage directly and cuts power to protect the cell, regardless of what the OS percentage shows. Run two full discharge-charge cycles and the fuel gauge will track actual cell voltage closely enough to eliminate the premature cutoff.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43391885705306,"sku":"BWCS-SMA908XL-1","price":27.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43391885738074,"sku":"BWCS-SMA908XL-2","price":31.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43391885770842,"sku":"BWCS-SMA908XL-3","price":34.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-SMA908XL-1.webp?v=1779142560","url":"https:\/\/batteryweb.com\/products\/samsung-galaxy-a90-5g-replacement-battery-385v-4400mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}