{"product_id":"htc-desire-z-replacement-battery-37v-1000mah-li-ion","title":"HTC Desire Z Replacement Battery BA S450 3.7V 1000mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eHTC Desire Z \/ A7272 — 3.7V Li-ion Replacement Battery (BA S450)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V 1000mAh Li-ion cell for the HTC Desire Z (A7272), also sold as the HTC Vision and BB96100. It slots into the same battery bay as the original BA S450 and shares the same connector pinout. Fits the full Desire Z family using the 35H00140-00M and 35H00140-01M part numbers.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eDesire Z \/ Vision platform fit:\u003c\/strong\u003e\n    These models run the same 3.7V power rail and use an identical three-pin connector with a shared BMS handshake protocol — one cell covers the entire range 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 a Desire Z unit. The BMS accepted charge from the onboard charge IC without fault flags and held voltage above 3.5V through the full discharge curve under mixed screen and radio load.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    On first installation, run the phone from 100% down to automatic shutdown, then charge uninterrupted to full. This gives the fuel gauge IC one complete reference cycle against the new cell before the OS starts reporting percentages — skipping this step is the main cause of erratic percentage readings after a cell swap.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Desire Z reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Desire Z uses a fuel gauge IC that builds its charge model around the discharge curve of the cell it first learned on. Swap in a new cell and the IC is still referencing the old curve — typically an aged cell with higher internal resistance and a steeper voltage drop. The result is a mismatch between the displayed percentage and actual state of charge. One full discharge-to-shutdown followed by an uninterrupted charge to 100% resets the coulomb counter and gives the IC a clean curve to map against.\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 fires a high-current burst — during a call, data sync, or Wi-Fi scan — and the cell voltage dips below the BMS cutoff threshold even though the displayed percentage looks fine. On a new cell, this is almost always a fuel gauge calibration problem rather than a faulty cell. The IC still thinks it's working with the old cell's voltage floor and cuts power too early. Do the full recalibration cycle first; if shutdown still occurs below 3.5V under load after two full cycles, check that the battery contacts are clean and making firm contact.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43405105004634,"sku":"BWCS-HT7272SL-1","price":22.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43405105037402,"sku":"BWCS-HT7272SL-2","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43405105070170,"sku":"BWCS-HT7272SL-3","price":27.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-HT7272SL-1.webp?v=1779369955","url":"https:\/\/batteryweb.com\/products\/htc-desire-z-replacement-battery-37v-1000mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}