{"product_id":"media-tech-mt846kb-replacement-battery-37v-900mah-li-ion","title":"Media-Tech MT846KB Compatible Battery 3.7V 900mAh Li-ion","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eMedia-Tech MT846KB — 3.7V Li-ion Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 900mAh Li-ion replacement battery for the Media-Tech MT846KB smartphone. It slots into the MT846KB and restores power to devices where the original cell has degraded or failed. Capacity is 3.33Wh at the rated voltage.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMT846KB fit:\u003c\/strong\u003e\n    The MT846KB uses a compact 53.00 × 34.00 × 4.30mm cell at 3.7V nominal. This replacement matches those physical and electrical parameters — the connector orientation and BMS communication lines align with what the phone's charge IC expects.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through charge and discharge on the MT846KB platform. The BMS handshake completed without fault codes, and the charge IC accepted current without thermal events or cutoff trips during the first three cycles.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration after install:\u003c\/strong\u003e\n    On first use after installation, disable fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC build an accurate discharge curve against the new cell before high-current charging is applied to 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 MT846KB reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe MT846KB's fuel gauge IC stores a learned discharge curve from the original cell. When a new cell goes in, that stored curve no longer matches the actual cell chemistry. The IC reads voltage and maps it to a percentage based on old data, so the number on screen drifts from reality. One full discharge to shutdown followed by a complete charge to 100% resets the coulomb counter and forces the IC to relearn the curve against the 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 cell voltage drops sharply under load — the modem or screen pulls current, and the cell cannot hold voltage above the BMS cutoff threshold despite the gauge still showing charge remaining. The fuel gauge IC is reading a flat part of the discharge curve incorrectly because it hasn't recalibrated yet. It's not a faulty cell — it's an uncalibrated gauge mapping the wrong voltage to the wrong percentage. Let the phone discharge fully to auto-shutdown, then charge uninterrupted to 100% to push the cutoff threshold back to the correct 3.0V floor.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43404329615450,"sku":"BWCS-EAC140SL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43404329648218,"sku":"BWCS-EAC140SL-2","price":27.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43404329680986,"sku":"BWCS-EAC140SL-3","price":29.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-EAC140SL-1.webp?v=1779369761","url":"https:\/\/batteryweb.com\/products\/media-tech-mt846kb-replacement-battery-37v-900mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}