{"product_id":"samsung-galaxy-a02-replacement-battery-385v-4900mah-li-polymer","title":"HQ-50S Samsung Galaxy A02 Replacement Battery 3.85V 4900mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSamsung Galaxy A02 — 3.85V Li-Polymer Replacement Battery (HQ-50S)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is the HQ-50S lithium-polymer cell for the Samsung Galaxy A02 (SM-A022F, SM-A022M\/DS and related variants). It fits the 2021 A02 lineup where the original cell has degraded and can no longer hold a charge. Capacity is 4900mAh at 3.85V nominal, matching the OEM specification.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSM-A022 variant coverage:\u003c\/strong\u003e\n    The SM-A022F, SM-A022M\/DS and associated regional variants all share the same battery bay geometry, connector pinout, and BMS handshake protocol — one cell fits the full A02 family without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through charge and discharge cycles on SM-A022F hardware. The BMS accepted the cell on first connection, voltage sat at 3.85V nominal under load, and charge termination triggered cleanly at full capacity with no fault codes.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration tip:\u003c\/strong\u003e\n    On first use after installation, disable fast charging and run one full discharge-to-charge cycle. This lets the fuel gauge IC map its coulomb counter against the new cell's actual discharge curve before high-current charging begins on 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 A02 after a cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens because the fuel gauge IC on the A02 is still reading the discharge curve of the old, degraded cell. When the new cell hits a voltage point the gauge hasn't mapped yet, the phone interprets it as a critical low-voltage event and cuts power. The fix is a full calibration cycle — run the phone down to automatic shutdown, then charge uninterrupted to 100% with fast charging off. After one complete cycle, the coulomb counter resets and the percentage display stabilises.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eUSB fast charge not triggering after replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eOn the first charge cycle after fitting a new HQ-50S, the A02's charge IC sometimes falls back to standard 5V charging rather than negotiating the higher-current profile. This occurs because the BMS on a fresh cell reports a high internal impedance state, which causes the charge IC to throttle back as a precaution. Let the first charge complete fully on a standard charger without interruption. On the second cycle, fast charging typically re-negotiates correctly once the BMS has logged an initial full cycle.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43391894847578,"sku":"BWCS-SMA220SL-1","price":30.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43391894880346,"sku":"BWCS-SMA220SL-2","price":34.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43391894913114,"sku":"BWCS-SMA220SL-3","price":37.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-SMA220SL-1.webp?v=1779142626","url":"https:\/\/batteryweb.com\/products\/samsung-galaxy-a02-replacement-battery-385v-4900mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}