{"product_id":"htc-butterfly-2-replacement-battery-385v-2600mah-li-polymer","title":"B0PAG100 HTC Butterfly 2 Replacement Battery 3.85V 2600mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eHTC Butterfly 2 \/ B810X \/ HTL23 — 3.85V Li-Polymer Replacement Battery (B0PAG100)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.85V, 2600mAh (10.01Wh) Li-Polymer cell for the HTC Butterfly 2, B810X, and HTL23 smartphones. It replaces OEM part numbers B0PAG100, BOPAG100, and 35H00223-00M. Fit the cell when the original no longer holds a charge or causes unexpected shutdowns mid-use.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eButterfly 2, B810X, and HTL23 compatibility:\u003c\/strong\u003e\n    All three models share the same battery bay geometry, connector pinout, and BMS communication protocol — the fuel gauge IC on each handset reads the same cell chemistry and reports state-of-charge using the same coulomb-counter calibration curve.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through a full discharge and charge sequence on a B810X, confirming the BMS accepted the cell without triggering an overcurrent or thermal cutoff fault, and that the charge IC ramped to the correct 4.35V termination voltage.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle fuel gauge reset:\u003c\/strong\u003e\n    On first use after installation, disable fast charging and run one complete discharge-to-charge cycle. This lets the fuel gauge IC recalibrate its coulomb counter against the new cell's discharge curve before high-current charging is introduced to 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 Butterfly 2 after a cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Butterfly 2's fuel gauge IC retains the discharge curve from the old, degraded cell after a swap. When the new cell hits a voltage region the IC hasn't mapped, the system reads the remaining charge as zero and cuts power — even though usable capacity is still present. The fix is one full uninterrupted discharge to automatic shutdown, followed by a full charge to 100% without interruption. After that single cycle, the coulomb counter recalibrates and percentage readings stabilise across the full range.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003ePhone warm near the battery bay on the first charge after replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eA new high-impedance Li-Polymer cell generates more heat than a worn cell during the initial charge cycle because internal resistance is briefly elevated before the cell's electrolyte fully wets the electrode surfaces. The charge IC on the Butterfly 2 does not reduce current for this condition on its own. Keep the phone out of a case for the first full charge and place it on a hard, flat surface — this is enough to dissipate the heat. By the second charge cycle, impedance drops and warmth returns to normal levels.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43392019464282,"sku":"BWCS-HTB810SL-1","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43392019497050,"sku":"BWCS-HTB810SL-2","price":28.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43392019529818,"sku":"BWCS-HTB810SL-3","price":31.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-HTB810SL-1.webp?v=1779142943","url":"https:\/\/batteryweb.com\/products\/htc-butterfly-2-replacement-battery-385v-2600mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}