{"product_id":"alcatel-ot-535-replacement-battery-37v-750mah-li-ion","title":"Alcatel BH4 OT-535 Replacement Battery 3.7V 750mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eAlcatel OT-535 \/ OT-735 Series — 3.7V Li-ion Replacement Battery (BH4)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 750mAh Li-ion cell replacing the original BH4 battery in the Alcatel OT-535, OT-735, OT-556, OT-557, and compatible variants. It fits the same physical bay and uses the same connector pinout as the factory cell. Capacity matches the original spec at 2.78Wh.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eOT-535 \/ OT-735 platform fit:\u003c\/strong\u003e\n    These models share the same 3.7V single-cell architecture, connector layout, and BMS handshake protocol — one cell covers all listed variants without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through a full charge-discharge cycle on an OT-535 body. The BMS accepted the cell without error flags, charge termination triggered correctly at 4.2V, and protection cutoff engaged at the expected low-voltage threshold.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    After fitting this cell, run one complete discharge to auto-off, then charge uninterrupted to 100% before normal use. The OT-535 fuel gauge IC was calibrated against the old cell's discharge curve — one full cycle resets that baseline against the new cell so percentage readings stay accurate.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the OT-535 reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe OT-535 uses a fuel gauge IC that tracks charge state by comparing current discharge behavior against a stored cell curve. When you replace the cell, the IC is still referencing the degraded curve of the old battery. The new cell has a different internal resistance and a steeper voltage-to-capacity relationship, so the IC misreads remaining charge. One full discharge-to-cutoff and uninterrupted recharge forces the IC to rebuild its reference curve against the actual new cell.\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 or display draws a current spike the cell cannot sustain at low state of charge — voltage collapses below the BMS protection threshold and the phone cuts off instantly. It is not a faulty cell; it is the fuel gauge IC firing shutdown based on a misread voltage cliff from an uncalibrated curve. Run one full discharge-to-cutoff cycle immediately after installation. After recalibration, the IC tracks the actual discharge curve and shutdown moves to the correct low-voltage point near 3.4–3.5V per cell.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43409461051482,"sku":"BWCS-OT535SL-1","price":21.99,"currency_code":"USD","in_stock":false},{"title":"Warranty 2 Year","offer_id":43409461084250,"sku":"BWCS-OT535SL-2","price":24.99,"currency_code":"USD","in_stock":false},{"title":"Warranty 3 Year","offer_id":43409461117018,"sku":"BWCS-OT535SL-3","price":26.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-OT535SL-big.webp?v=1779579767","url":"https:\/\/batteryweb.com\/products\/alcatel-ot-535-replacement-battery-37v-750mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}