{"product_id":"htc-one-e9-replacement-battery-385v-2800mah-li-polymer","title":"HTC One E9 Replacement Battery 3.85V 2800mAh 35H00239-00M","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eHTC One E9 \/ One E9 Plus — 3.85V Li-Polymer Replacement Battery (35H00239-00M)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.85V, 2800mAh lithium-polymer cell for the HTC One E9, One E9 Plus, A55, One E9w, and related variants. It replaces OEM part numbers 35H00239-00M, BOPJX100, B0PJX100, and 35H00239-09M. Fit this battery when the original cell no longer holds a charge or shuts down unexpectedly under load.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eE9 series compatibility:\u003c\/strong\u003e\n    The One E9, E9 Plus, E9w, and A55 all share the same battery bay geometry, 3.85V nominal voltage rail, and flex connector pinout — which is why a single cell covers the full cluster. The BMS handshake is identical across these variants, so the fuel gauge IC initialises without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell on an E9 unit through charge, load, and cutoff. The BMS held the 4.35V charge ceiling correctly and tripped the low-voltage cutoff at the expected floor without false shutdowns mid-cycle.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first cycle:\u003c\/strong\u003e\n    On first use after installation, disable fast charging and run one full discharge-to-charge cycle. This gives the fuel gauge IC a clean reference 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 replacement cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eA new lithium-polymer cell has a steeper voltage cliff than a worn cell the fuel gauge IC was previously calibrated to. When the modem transmits or the screen peaks, current draw spikes and cell voltage drops sharply — past the BMS cutoff threshold — even though the OS still shows 20–30% remaining. The fuel gauge's coulomb counter is reading against an old discharge curve, so the percentage displayed doesn't match actual cell voltage. One complete discharge cycle from 100% down to automatic shutdown, followed by a full charge, lets the IC remap its curve to the new cell. After that cycle, shutdowns at falsely high percentages stop.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eDevice won't power on after the battery sat in storage\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLithium-polymer cells self-discharge during storage. If the cell drops below approximately 2.5V, the BMS enters a deep-discharge lockout state and blocks normal charge current to prevent thermal runaway on a potentially damaged cell. Plugging into a standard charger appears to do nothing — the phone shows no charging animation. Connect the phone to a low-current USB source (a PC USB-A port, not a fast charger) and leave it for 20–30 minutes; the trickle current is enough to bring the cell above the BMS re-entry threshold, after which normal charging resumes. Once the phone shows a charging indicator, switch to the wall adapter to complete the charge.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43404160204890,"sku":"BWCS-HTE900SL-1","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43404160237658,"sku":"BWCS-HTE900SL-2","price":28.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43404160270426,"sku":"BWCS-HTE900SL-3","price":31.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-HTE900SL-1.webp?v=1779369252","url":"https:\/\/batteryweb.com\/products\/htc-one-e9-replacement-battery-385v-2800mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}