{"product_id":"htc-desire-z-replacement-battery-37v-1500mah-li-ion","title":"HTC Desire Z BA S450 Replacement Battery 3.7V 1500mAh","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, 1500mAh Li-ion cell built to fit the HTC Desire Z (A7272), Vision, and BB96100, plus seven additional compatible models. It replaces OEM part numbers BA S450, 35H00140-00M, and 35H00140-01M. If your Desire Z is shutting down early or no longer holding a charge through a normal day, this cell restores the original voltage rail the phone expects.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eDesire Z \/ A7272 platform compatibility:\u003c\/strong\u003e\n    The Desire Z, Vision, and BB96100 share the same PCB footprint, connector pinout, and BMS handshake protocol, which is why a single cell covers all of them. The phone's charge IC expects a 3.7V nominal cell — swapping to anything outside that window triggers a protection cutoff.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through full charge and load cycles on a Desire Z unit. The BMS accepted the handshake without faults, and the charge IC topped the cell to 4.2V within normal parameters — no thermal event, no cutoff error in the status register.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration after installation:\u003c\/strong\u003e\n    On first use, disable sync and background data, then run one complete discharge down to auto-shutdown followed by a full uninterrupted charge. The Desire Z's fuel gauge IC is calibrated to the old cell's impedance curve — one full cycle resets the coulomb counter against the new cell before the OS can misread state-of-charge.\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 Desire Z after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens because the fuel gauge IC is still using the discharge curve it learned from the old, degraded cell. When the new cell hits a voltage region the IC hasn't mapped, it loses track of remaining capacity and triggers an emergency shutdown — even though the cell has charge left. The modem radio and screen create a combined current spike the uncalibrated gauge interprets as a cliff. Run one full discharge-to-shutdown cycle without interrupting the charge afterward, and the coulomb counter rebuilds an accurate curve for the new cell.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003ePhone reports wrong battery percentage after installing the replacement cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Desire Z's fuel gauge IC stores learned capacity data from the previous cell in non-volatile memory — it doesn't auto-reset when you swap hardware. That stored curve no longer matches the new cell's actual voltage-to-capacity relationship, so percentage readings drift, jump, or stall at fixed values. Power the phone completely off, reinsert the battery, and run a single uninterrupted discharge-to-shutdown followed by a charge to 100% with the screen off. After that cycle, the IC recalibrates its internal register against the new cell and percentage reporting stabilises.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43405026787418,"sku":"BWCS-HT7272ML-1","price":22.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43405026820186,"sku":"BWCS-HT7272ML-2","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43405026852954,"sku":"BWCS-HT7272ML-3","price":27.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-HT7272ML-1.webp?v=1779369841","url":"https:\/\/batteryweb.com\/products\/htc-desire-z-replacement-battery-37v-1500mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}