{"product_id":"t-mobile-revvl-v-4g-replacement-battery-385v-4000mah-li-polymer","title":"T-Mobile REVVL V 4G Compatible Battery 3.85V 4000mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eT-Mobile REVVL V 4G — 3.85V Li-Polymer Replacement Battery (JU001)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.85V Li-Polymer cell replaces the original JU001 battery in the T-Mobile REVVL V 4G and TMRVL4G smartphones. It delivers 4000mAh (15.4Wh) of capacity — matching the factory specification. If your phone shuts down early, charges slowly, or won't hold a charge, this swap restores normal operation.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eREVVL V 4G and TMRVL4G fit:\u003c\/strong\u003e\n    Both model references point to the same hardware platform — same battery bay dimensions (80.00 × 65.30 × 4.60mm), same 3.85V rail, and the same BMS connector pinout. No adapter or modification needed.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through full charge and discharge on the REVVL V 4G platform. The BMS accepted the cell without error flags, and the charge IC communicated normally with the fuel gauge IC throughout.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle calibration on the REVVL V 4G:\u003c\/strong\u003e\n    On first use after installation, disable fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC recalibrate against the new cell's discharge curve before high-current charging pushes current into an uncalibrated cell — preventing inaccurate percentage readings from the first day.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the REVVL V 4G reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe REVVL V 4G uses a coulomb counter that builds a charge map against the original cell's impedance profile. When you install a new cell, the stored map no longer matches the real discharge curve. The phone reads voltage and estimates state-of-charge from stale data, so the percentage display drifts — often reading 10–15% higher or lower than actual charge. One full discharge to device shutdown, followed by an uninterrupted charge to 100%, forces the fuel gauge IC to write a fresh calibration map against the new cell.\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\"\u003eThis happens when the modem or screen draws a current spike the cell can't sustain at that state-of-charge — voltage sags below the BMS cutoff threshold and the phone shuts off instantly. It's not a defective battery; it's the fuel gauge IC cutting power at what it thinks is a safe floor, based on a miscalibrated curve. Run one full discharge-charge cycle without interruption to reset the fuel gauge's voltage-to-capacity mapping. After calibration, the BMS cutoff realigns and shutdowns at 20–30% stop.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43391787335770,"sku":"BWCS-CKT400SL-1","price":38.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43391787368538,"sku":"BWCS-CKT400SL-2","price":45.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43391787401306,"sku":"BWCS-CKT400SL-3","price":49.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-CKT400SL-1.webp?v=1779142036","url":"https:\/\/batteryweb.com\/products\/t-mobile-revvl-v-4g-replacement-battery-385v-4000mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}