{"product_id":"sony-ericsson-xperia-ion-replacement-battery-37v-1800mah-li-polymer","title":"Sony Ericsson Xperia ion 1251-9510.1 Compatible Battery 3.7V 1800mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSony Ericsson Xperia ion LT28 Series — 3.7V Li-Polymer Replacement Battery (LIS1485ERPC)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 1800mAh Li-Polymer replacement battery for the Sony Ericsson Xperia ion smartphone. It fits the LT28, LT28i, and LT28at model variants. Drop the original part numbers — it cross-references OEM codes 1251-9510.1, LIS1485ERPC, LIS1489ERPC, and 1251-9510.1C.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eLT28 variant compatibility:\u003c\/strong\u003e\n    The LT28, LT28i, and LT28at share the same battery bay dimensions, connector pinout, and BMS handshake protocol. Swapping between these variants uses the same cell — voltage rail stays at 3.7V nominal across all three.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell on an LT28i and monitored the BMS during charge cycles. The protection circuit engaged at both the 4.2V charge cutoff and the low-voltage discharge floor without fault codes.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration after install:\u003c\/strong\u003e\n    On first use after swapping this cell in, let the phone discharge to automatic shutdown, then charge to 100% without interruption. The Xperia ion's fuel gauge IC maps its charge curve to the new cell during this first full cycle — skipping it causes the percentage counter to read inaccurately for days.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Xperia ion reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Xperia ion uses a coulomb counter in its fuel gauge IC that was calibrated to the discharge curve of the original cell. When a new cell goes in, that stored curve no longer matches actual cell behaviour. The IC continues using the old data until it completes a full discharge-to-charge cycle with the new cell. Until that cycle runs, percentage readings can sit 10–20% above or below actual charge state.\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 modem or display's minimum operating threshold before the percentage counter reaches zero — a voltage cliff caused by the uncalibrated fuel gauge IC. The phone sees 25% remaining but the cell is already sagging under load. The fix is the same full recalibration cycle: discharge completely to auto-shutdown, then charge uninterrupted to 100%. After one complete cycle, the IC anchors its model to the new cell's actual 3.0V floor.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43404345802842,"sku":"BWCS-ERX280SL-1","price":24.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43404345835610,"sku":"BWCS-ERX280SL-2","price":27.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43404345868378,"sku":"BWCS-ERX280SL-3","price":30.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-ERX280SL-1.webp?v=1779369805","url":"https:\/\/batteryweb.com\/products\/sony-ericsson-xperia-ion-replacement-battery-37v-1800mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}