{"product_id":"o2-xda-stellar-replacement-battery-37v-1100mah-li-polymer","title":"O2 XDA Stellar Replacement Battery KAS160 3.7V 1100mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eO2 XDA Stellar — 3.7V Li-Polymer Replacement Battery (KAS160)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V, 1100mAh lithium-polymer cell replaces the original KAS160 battery in the O2 XDA Stellar. The XDA Stellar is a Windows Mobile smartphone from the mid-2000s, and finding a working cell for it is increasingly difficult. This battery restores power to the device using the original voltage and form factor.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eXDA Stellar platform fit:\u003c\/strong\u003e\n    The Stellar uses a single-cell Li-Polymer pack at 3.7V nominal. The connector pinout and BMS handshake align with OEM part numbers KAS160, KAIS160, 35H00088-00M, and 35H00086-00M — all variants of the same pack used across this device's production run.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran the cell through charge and discharge cycles on the bench. The BMS held charge cutoff correctly at 4.2V and triggered low-voltage protection before dropping below 3.0V under sustained load.\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 full discharge to automatic shutdown, then charge uninterrupted to 100%. The XDA Stellar's fuel gauge IC was calibrated to the original cell's discharge curve — skipping this step causes the percentage counter to read inaccurately from the first charge.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the XDA Stellar reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eWindows Mobile devices like the XDA Stellar use a fuel gauge IC that tracks charge state by learning the cell's discharge curve over time. When you fit a new cell, the IC still references the old curve — so the percentage shown on screen does not match actual charge level. This is not a fault with the battery. One complete discharge-to-shutdown followed by an uninterrupted full charge gives the IC enough data to recalibrate against the new cell. After that cycle, percentage readings stabilise.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSudden shutdown at 20–30% on the XDA Stellar after replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the fuel gauge IC is still running the old cell's voltage-to-capacity map. The new cell hits a voltage cliff under screen or radio load that the IC did not anticipate, so it cuts power before the displayed percentage reaches zero. The fix is the same recalibration cycle — one full discharge to shutdown, one full uninterrupted charge. If shutdowns continue after two full cycles, check that the battery connector seats fully, as a loose contact causes voltage sag under any significant load.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43405257211994,"sku":"BWCS-TP4550SL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43405257244762,"sku":"BWCS-TP4550SL-2","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43405257277530,"sku":"BWCS-TP4550SL-3","price":28.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-TP4550SL-1.webp?v=1779370350","url":"https:\/\/batteryweb.com\/products\/o2-xda-stellar-replacement-battery-37v-1100mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}