{"product_id":"texet-tm-333-replacement-battery-37v-1200mah-li-ion","title":"TeXet TM-333 TB-BL4U Compatible Battery 3.7V 1200mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eTeXet TM-333 \/ TM-D305 — 3.7V Li-ion Replacement Battery (TB-BL4U)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 1200mAh Li-ion replacement cell for the TeXet TM-333 and TM-D305 smartphones. It matches the OEM part number TB-BL4U and fits the original battery compartment at 62.00 × 38.00 × 4.50mm. Swap it when the original cell no longer holds a charge or causes unexpected shutdowns.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eTM-333 and TM-D305 compatibility:\u003c\/strong\u003e\n    Both models share the same 3.7V single-cell architecture, connector pinout, and BMS handshake protocol — a single TB-BL4U cell covers both without modification.\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 the TM-333, confirming the BMS accepted the cell, reported state-of-charge correctly, and did not trigger an over-voltage cutoff on completion.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle calibration tip:\u003c\/strong\u003e\n    On first use after installation, disable fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC recalibrate against the new cell's discharge curve before high-current charging pushes current into an uncalibrated state.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the TM-333 reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe TM-333 uses a fuel gauge IC that builds its discharge model from the previous cell's coulomb counter history. When a new cell goes in, the IC is still referencing the old degraded curve. The result is a percentage reading that doesn't match actual charge state — often showing 100% shortly after plugging in, then dropping fast. One full discharge-charge cycle resets the counter and aligns the gauge to the new cell's actual capacity.\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 fuel gauge IC hasn't finished recalibrating and the phone hits a voltage cliff under modem or screen load. The cell voltage drops sharply below the shutdown threshold even though the gauge still shows charge remaining. It's not a faulty cell — it's the IC acting on stale data. Run two full discharge-charge cycles without interruption and the shutdowns will stop as the coulomb counter resets to the new cell's actual floor voltage, typically around 3.4–3.5V under load.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43405018333274,"sku":"BWCS-NK4UXL-1","price":22.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43405018366042,"sku":"BWCS-NK4UXL-2","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43405018398810,"sku":"BWCS-NK4UXL-3","price":27.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-NK4UXL-1.webp?v=1779369842","url":"https:\/\/batteryweb.com\/products\/texet-tm-333-replacement-battery-37v-1200mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}