{"product_id":"alcatel-t790y-replacement-battery-385v-4250mah-li-polymer","title":"Alcatel T790Y Replacement Battery TLP043E7 3.85V 4250mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eAlcatel T790Y Series — 3.85V Li-Polymer Replacement Battery (TLP043E7)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.85V, 4250mAh Li-Polymer battery for the Alcatel T790Y, T790H, T790S, and T790W smartphones. It replaces the OEM cell TLP043E7 (also listed as TLp043E1) when the original no longer holds charge or has swollen. Dimensions are 78.54 × 63.00 × 4.95mm — measure your existing cell before fitting.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eT790 series compatibility:\u003c\/strong\u003e\n    The T790Y, T790H, T790S, and T790W share the same battery bay dimensions, connector pinout, and BMS handshake protocol — all use the TLP043E7 footprint with a matched 3.85V nominal rail.\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 T790 series hardware. The BMS accepted charge current without fault flags, and the protection circuit triggered correctly at low-voltage cutoff.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    On first use after installation, disable fast charging and run one complete discharge-charge cycle at standard current. This lets the fuel gauge IC map the new cell's discharge curve before the OS uses that data for percentage reporting.\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 T790Y after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eA new Li-Polymer cell has a slightly different voltage-versus-capacity curve than the aged cell it replaces. The fuel gauge IC on the T790Y is still calibrated to the old, degraded curve. When the phone hits a voltage point the IC associates with \"nearly empty,\" it shuts down — even if the new cell still has usable charge. The fix is one full discharge-charge cycle without fast charging, which forces the coulomb counter to re-learn the cell endpoints. After that cycle, shutdowns below 30% typically stop.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eUSB fast charge not activating on the first cycle after replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eOn the first charge after fitting a new cell, the T790Y's charge IC may fall back to standard 5V charging rather than negotiating a higher voltage. This happens because the BMS on a new, uncalibrated cell can present an unusual impedance signature that causes the handshake to fail. Plug into a standard 5V charger for the first full cycle, then switch back to your fast charger on the second charge. Most users see fast charging resume normally from cycle two onward.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43391940984922,"sku":"BWCS-OPT790SL-1","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43391941017690,"sku":"BWCS-OPT790SL-2","price":30.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43391941050458,"sku":"BWCS-OPT790SL-3","price":33.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-OPT790SL-1.webp?v=1779142677","url":"https:\/\/batteryweb.com\/products\/alcatel-t790y-replacement-battery-385v-4250mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}