{"product_id":"t-mobile-sgh-t959w-replacement-battery-37v-3000mah-li-ion","title":"Samsung Galaxy S4 T-Mobile SGH-T959W Replacement Battery 3.7V 3000mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eT-Mobile SGH-T959W Vibrant — 3.7V Li-ion Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 3000mAh Li-ion replacement battery for the T-Mobile SGH-T959W and Vibrant smartphones. It slots into the original battery compartment and connects via the standard Samsung three-pin contact strip. Voltage and capacity are matched to the original cell specification.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSGH-T959W and Vibrant compatibility:\u003c\/strong\u003e\n    Both models share the same physical housing, contact pin layout, and 3.7V nominal voltage rail. The BMS handshake uses the same thermistor pin on the three-contact connector, so the charge IC accepts this cell without firmware flags.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this battery through charge and discharge on the SGH-T959W platform. The BMS held cutoff correctly at low voltage, and the charge IC accepted full current without tripping protection.\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 and run one complete discharge-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 SGH-T959W after a cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens because the fuel gauge IC is still reading the old cell's voltage-to-capacity curve. A fresh cell has a steeper voltage cliff under modem and display load than a degraded one. When the phone pulls peak current — during a call, screen-on burst, or LTE ping — the new cell's voltage drops sharply. The IC reads that drop as empty and shuts the device down. One full discharge-charge cycle corrects the calibration and stops the premature cutoff.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003ePercentage jumping erratically after installing the replacement cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe coulomb counter in the SGH-T959W's fuel gauge IC was calibrated to the discharge profile of the original cell. A new 3000mAh cell presents a different impedance and open-circuit voltage curve at each state of charge. Until the IC completes at least one full cycle, it interpolates poorly between reference points and reports unstable percentages. Charge the device to 100%, allow it to discharge below 5% without interruption, then charge back to 100% — the gauge resets its reference table at both endpoints.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43405097828442,"sku":"BWCS-SMG900WL-1","price":30.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43405097861210,"sku":"BWCS-SMG900WL-2","price":35.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43405097893978,"sku":"BWCS-SMG900WL-3","price":38.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-SMG900WL-1.webp?v=1779369970","url":"https:\/\/batteryweb.com\/products\/t-mobile-sgh-t959w-replacement-battery-37v-3000mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}