{"product_id":"sony-ericsson-xperia-s-replacement-battery-37v-1500mah-li-ion","title":"Sony Ericsson Xperia S BA800 Compatible Battery 3.7V 1500mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSony Ericsson Xperia S \/ LT26i — 3.7V Li-ion Replacement Battery (BA800)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 1500mAh Li-ion replacement battery for the Sony Ericsson Xperia S smartphone, OEM part number BA800. It fits the LT26 and LT26i hardware revisions along with the Arc HD and 14 additional Xperia variants that share the same BA800 footprint. Voltage and cell dimensions match the original spec exactly: 56.80 × 52.90 × 5.10mm.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eLT26 \/ LT26i platform compatibility:\u003c\/strong\u003e\n    All LT26-series boards run the same 3.7V power rail and use an identical connector pinout and BMS handshake protocol. That is why the BA800 spans the Xperia S, Arc HD, and related variants without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell on an LT26i unit and confirmed the BMS accepted the charge handshake on the first connection. Charge current ramped correctly through CC and CV phases with no fault flags thrown by the charge IC.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    On first use after installation, run one full discharge-to-charge cycle with fast charging disabled. This lets the fuel gauge IC map its coulomb counter against the new cell's actual discharge curve before high-current charging is applied to 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\"\u003eSudden shutdown at 20–30% on the Xperia S after a cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Xperia S shuts down mid-use at 20–30% because the fuel gauge IC is still using the old cell's discharge curve after replacement. When the modem fires a transmission burst or the display peaks in brightness, the new cell experiences a voltage dip the uncalibrated gauge did not predict. The processor interprets that dip as a critical undervoltage event and cuts power before the gauge reads zero. One complete discharge-charge cycle forces the coulomb counter to relearn the new cell's voltage-versus-capacity relationship and eliminates most of these early shutdowns.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003ePhone warm near the battery compartment during the first charge after installation\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eA fresh BA800 cell leaves the warehouse with higher internal impedance than a conditioned cell. On the first charge cycle, the charge IC pushes current into that higher-impedance cell, and the resistance converts some of that energy directly to heat. This is normal and typically resolves after two to three full cycles as the cell's internal impedance drops. If warmth persists beyond the third cycle or the phone becomes hot to the touch, check that no third-party fast-charge adapter is forcing current above the LT26i's rated charge rate of 5V\/1A.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43405014171738,"sku":"BWCS-ERA800SL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43405014204506,"sku":"BWCS-ERA800SL-2","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43405014237274,"sku":"BWCS-ERA800SL-3","price":29.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-ERA800SL-1.webp?v=1779369805","url":"https:\/\/batteryweb.com\/products\/sony-ericsson-xperia-s-replacement-battery-37v-1500mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}