{"product_id":"samsung-nexus-s-replacement-battery-37v-2800mah-li-ion","title":"Samsung Nexus S AB653850CA Replacement Battery 3.7V 2800mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSamsung Nexus S \/ Nexus S 4G — 3.7V Li-ion Replacement Battery (AB653850CA)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 2800mAh Li-ion cell replacing the original AB653850CA in the Samsung Nexus S and Nexus S 4G. It fits GT-I9020 and GT-I9020T hardware directly. Slide the original out, drop this in — connector and form factor are a direct match at 51.68 × 41.50 × 12.51mm.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eGT-I9020 and GT-I9020T compatibility:\u003c\/strong\u003e\n    Both the standard Nexus S and the 4G variant share the same battery bay dimensions, connector pinout, and BMS communication protocol — one cell fits both boards without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran charge-discharge cycles on a GT-I9020 board. The BMS accepted charge current without fault codes, and cell voltage held stable across the full discharge curve from 4.2V down to the 3.0V cutoff.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    After fitting this cell, disable fast charging if available and run one full discharge-to-charge cycle before normal use. The Nexus S fuel gauge IC calibrates its coulomb counter against the actual cell discharge curve — skipping this step can cause the OS to report inaccurate percentages for the first several cycles.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Nexus S reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Nexus S uses a fuel gauge IC that tracks charge state against a stored discharge curve from the original cell. When a new cell goes in, that stored curve no longer matches actual cell behaviour, so the reported percentage drifts from reality. The fix is one complete discharge-charge cycle with the screen on at moderate brightness — this forces the coulomb counter to re-anchor against the new cell's actual voltage-to-capacity relationship. After that cycle, percentage accuracy returns to normal operating tolerance.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSudden shutdown at 20–30% on the Nexus S\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the cell voltage drops sharply under modem or display load — a voltage cliff the fuel gauge IC didn't predict because it was still calibrated to a degraded old cell. The Nexus S modem radio draws hard burst current, and if the cell can't hold voltage above the protection threshold during that burst, the BMS trips and the phone cuts out. Fitting a fresh cell resolves the capacity side, but the shutdowns won't stop until the fuel gauge IC recalibrates. Run one full cycle and check that resting voltage after a full charge reads 4.18–4.20V before trusting the percentage readout.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43405084295258,"sku":"BWCS-SM9020XL-1","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43405084328026,"sku":"BWCS-SM9020XL-2","price":29.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43405084360794,"sku":"BWCS-SM9020XL-3","price":32.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-SM9020XL-1.webp?v=1779369934","url":"https:\/\/batteryweb.com\/products\/samsung-nexus-s-replacement-battery-37v-2800mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}