{"product_id":"t-mobile-tmaf025g-replacement-battery-385v-4000mah-li-polymer","title":"T-Mobile TMAF025G Compatible Battery 3.85V 4000mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eT-Mobile TMAF025G \/ Revvl 6 5G — 3.85V Li-Polymer Replacement Battery (RE001)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.85V, 4000mAh (15.4Wh) Li-Polymer battery for the T-Mobile TMAF025G and Revvl 6 5G smartphones. It replaces the original RE001 cell when the existing battery no longer holds a usable charge. Dimensions are 87.20 × 64.00 × 4.20mm — confirm before ordering if you have an aftermarket shell.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eTMAF025G and Revvl 6 5G compatibility:\u003c\/strong\u003e\n    Both model names refer to the same hardware platform. They share the same battery bay, connector pinout, and BMS handshake protocol, so one cell covers both SKUs 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 a full charge-discharge cycle on a Revvl 6 5G unit. The BMS accepted charge current correctly, reported state-of-charge to the OS without error flags, and held voltage above 3.6V through the mid-cycle load.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle fast charge protocol:\u003c\/strong\u003e\n    On first use after installation, disable fast charging for one complete discharge-charge cycle. The fuel gauge IC is calibrated to the old cell's discharge curve. Running a slow cycle first lets the coulomb counter re-anchor to the new cell before high-current fast charging begins.\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 Revvl 6 5G after a cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens because the fuel gauge IC still holds the discharge curve of the original degraded cell. When load spikes — 5G modem, screen at full brightness, background sync — the new cell's voltage drops faster than the IC expects at that state-of-charge. The phone reads the voltage dip as a near-empty condition and triggers an emergency shutdown. One full slow discharge to automatic power-off, followed by an uninterrupted charge to 100%, resets the coulomb counter and stops the early shutdowns.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBattery percentage jumping erratically after replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eErratic percentage readings — jumping from 60% to 40% or spiking upward mid-discharge — point to a fuel gauge IC that hasn't mapped the new cell yet. The IC uses a stored charge curve from the old cell to estimate remaining capacity, and a fresh cell with different internal resistance throws those estimates off. This is not a faulty battery. Perform two full uninterrupted discharge-to-shutdown and charge-to-100% cycles with fast charging disabled. After the second cycle, readings stabilise as the IC completes recalibration.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43391787237466,"sku":"BWCS-TMR600SL-1","price":38.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43391787270234,"sku":"BWCS-TMR600SL-2","price":45.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43391787303002,"sku":"BWCS-TMR600SL-3","price":49.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-TMR600SL-1.webp?v=1779142051","url":"https:\/\/batteryweb.com\/products\/t-mobile-tmaf025g-replacement-battery-385v-4000mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}