{"product_id":"o2-xda-cosmo-replacement-battery-37v-1050mah-li-ion","title":"O2 XDA Cosmo Replacement Battery EXCA160 3.7V 1050mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eO2 XDA Cosmo — 3.7V Li-ion Replacement Battery (EXCA160)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 1050mAh Li-ion battery for the O2 XDA Cosmo smartphone. It replaces OEM part numbers EXCA160 and 35H00080-00M. If your original cell has degraded or stopped holding a charge, this is the direct swap.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eXDA Cosmo compatibility:\u003c\/strong\u003e\n    The XDA Cosmo uses a single-cell Li-ion pack at 3.7V nominal with a proprietary connector. This cell matches that voltage rail and physical footprint — 54.20 x 35.80 x 5.60mm — so it seats correctly in the battery bay 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 full charge and discharge on a calibrated rig. The BMS handled cutoff at both ends correctly — no overcharge bleed and no undervoltage trip until the cell dropped below 3.0V under load.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration after installation:\u003c\/strong\u003e\n    On first use, disable any fast-charge mode and run one complete discharge-charge cycle. This lets the fuel gauge IC map its reference points against the new cell's discharge curve before high-current charging hits an uncalibrated register.\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 Cosmo reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe XDA Cosmo uses a fuel gauge IC that stores a learned discharge curve from the original cell. When a new cell goes in, that stored curve no longer matches reality. The IC reads voltage and maps it to a percentage based on old data, so the display can read 40% while the cell is actually near empty. One full discharge down to auto-shutdown, followed by a full charge, forces the IC to rewrite its reference table. After that cycle, percentage readings track correctly.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSudden shutdown at 20–30% on the XDA Cosmo after fitting a replacement cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the modem or display draws a current spike that the cell can't sustain at low state-of-charge. Voltage collapses faster than the fuel gauge expects, and the phone shuts off before the display hits 0%. It's not a faulty cell — it's the fuel gauge IC firing shutdown on a voltage cliff it wasn't calibrated to see. Run the recalibration cycle first: one full discharge to auto-shutdown, then charge uninterrupted to 100%. If the shutdowns continue after two full cycles, check that the battery connector is fully seated — a loose contact raises effective internal resistance and brings the voltage cliff higher.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43405224312922,"sku":"BWCS-DC700SL-1","price":22.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43405224345690,"sku":"BWCS-DC700SL-2","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43405224378458,"sku":"BWCS-DC700SL-3","price":27.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-DC700SL-1.webp?v=1779370349","url":"https:\/\/batteryweb.com\/products\/o2-xda-cosmo-replacement-battery-37v-1050mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}