{"product_id":"gigaset-gs290-replacement-battery-385v-4800mah-li-polymer","title":"Gigaset GS290 Replacement Battery 3.85V 4800mAh Li-Polymer","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eGigaset GS290 — 3.85V Li-Polymer Replacement Battery (V30145-K1310-X475)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.85V, 4800mAh Li-Polymer cell for the Gigaset GS290 smartphone. It replaces the original battery when the phone no longer holds a usable charge or shuts down unexpectedly. Capacity and connector position match the OEM specification (V30145-K1310-X475).\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eGS290 fit:\u003c\/strong\u003e\n    The GS290 uses a single-cell Li-Polymer pack with a low-profile 5.20mm thickness. This cell matches that form factor — 82.00 x 61.90 x 5.20mm — along with the correct connector orientation the phone's charge IC expects for BMS communication.\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 a GS290 unit. The BMS handshake completed without fault codes, and the charge IC accepted current at both standard and fast-charge rates after the first full cycle.\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 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 cell.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the GS290 reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe GS290 uses a coulomb counter tied to the fuel gauge IC. That IC builds its percentage model against the discharge curve of the original cell. When you install a new cell, the IC is still referencing the old curve — so percentage readings are off until it recalibrates. Run one full discharge down to automatic shutdown, then charge uninterrupted to 100% without using the phone. After that cycle, the gauge re-anchors to the new cell and percentage accuracy returns.\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 below the phone's minimum threshold under load — typically during heavy modem activity, screen brightness peaks, or app processor bursts. The fuel gauge shows 25% but the cell can no longer sustain the voltage rail under that current draw. The BMS cuts output to protect the cell rather than let voltage sag further. Run two full calibration cycles and check that the reported shutdown voltage is above 3.4V — if it's cutting out above 3.6V, the cell needs a full recalibration cycle before the gauge tracks load voltage correctly.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43391782387802,"sku":"BWCS-GMS290SL-1","price":43.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43391782420570,"sku":"BWCS-GMS290SL-2","price":51.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43391782453338,"sku":"BWCS-GMS290SL-3","price":56.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-GMS290SL-1.webp?v=1779141908","url":"https:\/\/batteryweb.com\/products\/gigaset-gs290-replacement-battery-385v-4800mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}