{"product_id":"t-mobile-touch-pro-2-replacement-battery-37v-2800mah-li-ion","title":"T-Mobile Touch Pro 2 Replacement Battery BA S390 3.7V 2800mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eT-Mobile Touch Pro 2 — 3.7V Li-ion Replacement Battery (BA S390)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 2800mAh Li-ion battery for the T-Mobile Touch Pro 2 and Touch Pro II smartphones. It replaces OEM part numbers BA S390, RHOD160, 35H00123-00M, and 35H00123-02M. If your original cell has swollen, lost capacity, or the phone shuts down unexpectedly, this is the direct cell swap.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eTouch Pro 2 and Touch Pro II fitment:\u003c\/strong\u003e\n    Both the Touch Pro 2 and Touch Pro II use the same battery bay geometry, connector pinout, and BMS handshake — one cell covers both variants without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through charge and discharge on the Touch Pro 2 platform. The BMS accepted charge from the device's onboard charge IC without voltage rejection or fault flags on either variant.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    After fitting this cell, run one full discharge down to auto-shutdown, then charge to 100% uninterrupted. The Touch Pro 2's fuel gauge IC maps its coulomb counter to the new cell's discharge curve during this first cycle — skipping it causes erratic percentage readings.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Touch Pro 2 reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe Touch Pro 2 uses a fuel gauge IC that stores a learned discharge curve from the old cell. When a new cell goes in, that stored curve no longer matches the actual voltage-to-capacity relationship of the replacement. The IC maps voltage readings against the old profile, so 60% on screen may be 40% actual charge. One full discharge-to-shutdown cycle followed by an uninterrupted charge to 100% forces the IC to recalibrate against the new cell's real curve. After that single cycle, percentage reporting stabilises.\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 cell voltage drops sharply under load — a voltage cliff — before the fuel gauge reads zero. The Touch Pro 2's WCDMA modem and keyboard backlight pull simultaneous current spikes that expose this cliff faster than screen-on idle. The phone's hardware undervoltage cutoff triggers at approximately 3.2V per cell, which can occur while the gauge still shows charge remaining. After two full discharge-charge cycles, the fuel gauge IC tightens its voltage model and premature shutdowns typically stop.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43405143179354,"sku":"BWCS-HDP180HL-1","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43405143212122,"sku":"BWCS-HDP180HL-2","price":29.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43405143244890,"sku":"BWCS-HDP180HL-3","price":32.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-HDP180HL-1.webp?v=1779370263","url":"https:\/\/batteryweb.com\/products\/t-mobile-touch-pro-2-replacement-battery-37v-2800mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}