{"product_id":"oneplus-7t-replacement-battery-385v-3700mah-li-polymer","title":"OnePlus 7T BLP743 Replacement Battery 3.85V 3700mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eOnePlus 7T Series — 3.85V Li-Polymer Replacement Battery (BLP743)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.85V, 3700mAh (14.25Wh) Li-Polymer replacement battery for the OnePlus 7T smartphone. It fits models HD1905, HD1901, and HD1903 — all variants of the 7T lineup that share the BLP743 cell format. Swap it in when the original cell no longer holds charge or has swollen beyond safe use.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003e7T variant compatibility:\u003c\/strong\u003e\n    The HD1905, HD1901, and HD1903 share the same internal battery bay dimensions, connector pinout, and BMS communication protocol — that is why one cell covers all three. The BLP743 format fits each without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell on a HD1901 unit, monitored BMS handshake at power-on, and confirmed the charge IC accepted the cell without fault codes. Capacity read-back aligned with the rated 3700mAh within standard tolerance.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    After installation, disable Warp Charge and run one full discharge-charge cycle at standard 5V\/2A. This lets the fuel gauge IC map the new cell's discharge curve before high-current charging pushes current into an uncalibrated coulomb counter — preventing erratic percentage readings from the first hour of use.\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 BLP743 replacement cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the fuel gauge IC is still calibrated to the old cell's discharge curve. The new cell hits a steeper voltage cliff under display or modem load than the old curve predicts, and the system shuts down before the reported percentage reaches zero. It is not a fault in the cell itself. Run one complete discharge to auto-off, then charge uninterrupted to 100% — after that cycle, the coulomb counter resets its reference points and the shutdowns stop.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWarp Charge not activating on first cycle after replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eOn the first charge after a cell swap, the OnePlus charge IC runs a verification pass against the new BMS before enabling high-current Warp Charge. If the BMS has not completed its initial handshake — which requires at least one partial discharge — the phone falls back to standard 5V charging silently, with no notification. Discharge the phone to below 15% before plugging in for the second time. Warp Charge typically re-engages at that point, and the charging brick LED will confirm the high-current mode is active.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43391943901274,"sku":"BWCS-OPT740SL-1","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43391943934042,"sku":"BWCS-OPT740SL-2","price":30.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43391943966810,"sku":"BWCS-OPT740SL-3","price":33.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-OPT740SL-1.webp?v=1779142677","url":"https:\/\/batteryweb.com\/products\/oneplus-7t-replacement-battery-385v-3700mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}