{"product_id":"optus-x-spirit-replacement-battery-38v-2000mah-li-ion","title":"TLi020F1 Optus X Spirit Replacement Battery 3.8V 2000mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eOptus X Spirit — 3.8V Li-ion Replacement Battery (TLi020F1)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.8V, 2000mAh Li-ion replacement battery for the Optus X Spirit smartphone. It uses OEM part number TLi020F1 and fits directly into the X Spirit's battery bay. Voltage and physical dimensions — 70.75 × 51.20 × 4.70mm — match the original cell specification.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eX Spirit compatibility:\u003c\/strong\u003e\n    The TLi020F1 cell operates on a 3.8V nominal rail with a BMS configured for the X Spirit's charge IC handshake. The connector pinout and protection circuit board match what the device's charge controller 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 X Spirit platform. The BMS held cutoff correctly at both low-voltage and charge-termination thresholds, and the fuel gauge IC accepted the cell without triggering fault flags.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle calibration tip:\u003c\/strong\u003e\n    On first use after installation, disable fast charging and run one complete discharge-charge cycle at standard rate. This lets the fuel gauge IC recalibrate its coulomb counter against the new cell's discharge curve before high-current charging begins.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the X Spirit reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe X Spirit uses a fuel gauge IC that builds its charge model against the original cell's internal resistance and discharge curve. When a new cell goes in, that stored model no longer matches the physical cell. The gauge reads voltage correctly but miscalculates state of charge because its coulomb counter was calibrated to the old cell. One full discharge-to-shutdown followed by a complete charge cycle forces the IC to rebuild the model against the new cell.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSudden shutdown at 20–30% remaining on the replacement cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the modem or display draws a high current pulse and the cell voltage sags below the BMS cutoff threshold — even though the gauge still shows charge remaining. It is a voltage-under-load failure, not a capacity failure. The fuel gauge IC hasn't yet mapped the new cell's voltage cliff, so it doesn't predict the drop before it hits. Run two full discharge-charge cycles at standard rate to let the gauge learn where that cliff sits on this specific cell.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43404274565210,"sku":"BWCS-OT704SL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43404274597978,"sku":"BWCS-OT704SL-2","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43404274630746,"sku":"BWCS-OT704SL-3","price":29.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-OT704SL-1.webp?v=1779369616","url":"https:\/\/batteryweb.com\/products\/optus-x-spirit-replacement-battery-38v-2000mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}