{"product_id":"t-mobile-mytouch-replacement-battery-37v-1800mah-li-ion","title":"T-Mobile myTouch HB5N1 Compatible Battery 3.7V 1800mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eT-Mobile myTouch Q U8730 \/ U8680 — 3.7V Li-ion Replacement Battery (HB5N1)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V, 1800mAh Li-ion cell replaces the OEM HB5N1 and HB5N1H batteries in the T-Mobile myTouch, myTouch Q, myTouch Q U8730, and myTouch U8680 smartphones. It slots directly into the same battery bay and connects to the same three-contact strip the original cell used. Capacity is rated at 6.66Wh.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003emyTouch and myTouch Q platform fit:\u003c\/strong\u003e\n    The U8680 and U8730 share the same battery cavity dimensions, connector pinout, and BMS handshake protocol — which is why one cell covers both boards. The HB5N1H is a minor hardware revision of the HB5N1 and uses the same communication lines to the charge IC.\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 a myTouch Q board and confirmed the BMS accepted the cell, reported state-of-charge to the OS, and did not trigger an overcurrent fault during the initial charge ramp.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first install:\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 its coulomb counter against the new cell's discharge curve before high-current charging pushes current into 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 myTouch after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThis is a voltage cliff problem, not a capacity problem. Under modem transmit load or screen brightness peaks, the cell voltage drops sharply below the threshold the phone's power IC expects. The OS still shows 20–30% because the fuel gauge IC hasn't recalibrated to the new cell's discharge curve yet. Run one full discharge down to automatic shutdown, then charge uninterrupted to 100% — after that cycle, the coulomb counter realigns and the shutdowns stop.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003ePhone reporting wrong battery percentage after installing the HB5N1\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe fuel gauge IC on the myTouch 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 fresh cell. The result is percentage readings that jump erratically or plateau well above zero before shutdown. Force a full recalibration cycle: drain the phone to automatic power-off, then charge to 100% with the screen off. The fuel gauge IC will rewrite its reference curve against the new cell at approximately 3.0V at cutoff and 4.2V at full charge.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43405039304794,"sku":"BWCS-HUM660XL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43405039337562,"sku":"BWCS-HUM660XL-2","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43405039370330,"sku":"BWCS-HUM660XL-3","price":29.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-HUM660XL-1.webp?v=1779369841","url":"https:\/\/batteryweb.com\/products\/t-mobile-mytouch-replacement-battery-37v-1800mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}