{"product_id":"sony-ericsson-xperia-neo-replacement-battery-37v-1000mah-li-ion","title":"Sony Ericsson BA700 Xperia Neo Replacement Battery 3.7V 1000mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSony Ericsson Xperia Neo \/ MT15i — 3.7V Li-ion Replacement Battery (BA700)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 1000mAh Li-ion replacement battery for the Sony Ericsson Xperia Neo smartphone. It carries OEM part number BA700 and fits the MT15a, MT15i, Halon, and over 36 additional MT-series variants. It slots into the same battery bay as the original cell with no modifications needed.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMT15-series platform fit:\u003c\/strong\u003e\n    The MT15a and MT15i share the same 3.7V power rail, connector pinout, and BMS handshake protocol — one cell covers all variants on this platform without voltage mismatch risk.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell on an MT15i unit and confirmed the BMS accepted the charge handshake on the first cycle. Charge current stepped correctly from pre-charge to CC to CV without fault flags.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    On first install, run one full discharge to automatic cutoff, then charge uninterrupted to 100% before resuming normal use. The Xperia Neo's fuel gauge IC maps its coulomb-counter baseline against that first complete cycle — skipping it causes the percentage display to drift immediately.\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 Neo reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Xperia Neo uses a coulomb-counter-based fuel gauge IC that stores a learned discharge curve for the installed cell. When you swap in a new cell, that stored curve no longer matches the new cell's actual voltage-to-capacity profile. The IC keeps reading against the old curve until it completes one full calibration cycle. Run one uninterrupted discharge and full recharge to let the IC lock onto the new curve — after that, percentage reporting stabilises.\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 sharply under combined modem and display load — a voltage cliff the fuel gauge didn't predict because calibration wasn't complete. The phone's protection circuit trips on undervoltage before the displayed percentage reaches zero. It is not a faulty cell; it is a calibration gap. Complete one full discharge-charge cycle and the IC will mark the real cliff point, ending the premature shutdowns.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43405095501914,"sku":"BWCS-ERM15SL-1","price":27.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43405095534682,"sku":"BWCS-ERM15SL-2","price":31.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43405095567450,"sku":"BWCS-ERM15SL-3","price":33.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-ERM15SL-1.webp?v=1779369955","url":"https:\/\/batteryweb.com\/products\/sony-ericsson-xperia-neo-replacement-battery-37v-1000mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}