{"product_id":"htc-rezound-replacement-battery-37v-1150mah-li-ion","title":"HTC Rezound Replacement Battery BTR6425B 3.7V 1150mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eHTC Rezound \/ ThunderBolt 2 — 3.7V Li-ion Replacement Battery (BTR6425B)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 1150mAh Li-ion replacement battery for the HTC Rezound, Vigor, ThunderBolt 2, and Droid Incredible HD. It uses OEM part numbers BTR6425B, BTR6425, 35H00168-02M, 35H00168-03M, BH98100, and 35H00168-06M. Swap it in when your original cell no longer holds a charge or causes unexpected shutdowns.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eRezound \/ ThunderBolt 2 platform compatibility:\u003c\/strong\u003e\n    These models share the same battery bay dimensions (57 x 44 x 5mm), connector pinout, and BMS handshake protocol — one cell fits all listed 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 full charge and discharge on a Rezound unit. The BMS communicated charge state correctly, cutoff triggers fired at the correct low-voltage threshold, and charge acceptance across the full 1150mAh capacity was confirmed.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    After installing this cell, disable fast charging and run one complete discharge-charge cycle at standard rate. The Rezound's fuel gauge IC is calibrated to the old cell's discharge curve — this single cycle resets it against the new cell before high-current charging is applied.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Rezound reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Rezound uses a coulomb-counting fuel gauge IC that builds its percentage model from the previous cell's charge curve over many cycles. When you install a new cell, that model is stale — it doesn't match the new cell's actual voltage-to-capacity relationship. The gauge can over- or under-report by 10–20% until it relearns. One full discharge down to automatic cutoff, followed by a full uninterrupted charge, forces the IC to rebuild its lookup table against the replacement cell.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSudden shutdown at 20–30% charge remaining\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the cell voltage drops sharply under the combined load of the LTE modem, display, and processor — a voltage cliff the fuel gauge didn't predict. The phone reads 25% on the gauge but the actual cell voltage has already dipped below the shutdown threshold under that instantaneous current draw. It is not a defective battery; it is a miscalibrated gauge. Run two full discharge-charge cycles at standard charge rate and confirm the cell rests at 4.15–4.20V at 100% gauge reading before returning to normal use.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43405045694554,"sku":"BWCS-HT6425SL-1","price":22.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43405045727322,"sku":"BWCS-HT6425SL-2","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43405045760090,"sku":"BWCS-HT6425SL-3","price":27.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-HT6425SL-1.webp?v=1779369882","url":"https:\/\/batteryweb.com\/products\/htc-rezound-replacement-battery-37v-1150mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}