{"product_id":"orange-rio-ii-replacement-battery-37v-900mah-li-ion","title":"Orange Rio II Replacement Battery 3.7V 900mAh Li3710T42P3h483757","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eOrange Rio II — 3.7V Li-ion Replacement Battery (Li3710T42P3h483757)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 900mAh Li-ion replacement battery for the Orange Rio II and Rio 2. It fits the mid-2000s handset directly, using OEM part number Li3710T42P3h483757. Swap it in when the original cell no longer holds a charge or fails to power the phone.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eRio II and Rio 2 fitment:\u003c\/strong\u003e\n    Both model names refer to the same handset on the same voltage rail with the same connector pinout and cell footprint — 47.67 x 37.27 x 5.80mm. One cell covers both.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran a full charge-discharge cycle and confirmed the BMS engaged charge termination cleanly at 4.2V. Cell voltage held stable under simulated call and display load without sagging below the BMS cutoff floor.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    On first use after fitting, run the phone down to auto-shutoff, then charge uninterrupted to 100%. The Rio II's fuel gauge IC maps its discharge curve against the new cell on this first full cycle — skip it and the percentage readings will drift.\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 Rio II after a cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Rio II's fuel gauge IC was calibrated against the discharge curve of the original aged cell. A new 900mAh cell has a steeper voltage drop-off at the low end of charge than a degraded cell does. The phone reads that voltage cliff as empty and shuts down — even though usable capacity remains. One full discharge-to-shutoff followed by an uninterrupted charge to 100% resets the calibration. After that cycle, shutdowns at false percentages stop.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003ePhone won't power on after the battery sat in storage\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-ion cells self-discharge at roughly 2–3% per month. A battery stored for a year or more can drop below 2.5V per cell, which triggers BMS lockout to prevent cell damage. The phone shows nothing — no boot screen, no charging indicator. Connect the phone to a low-current USB charger and leave it for 30–60 minutes before attempting to power on. The BMS needs a trickle charge to recover cell voltage above the 2.5V re-enable threshold before it will pass current to the phone.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43405060440154,"sku":"BWCS-ZTF930SL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43405060472922,"sku":"BWCS-ZTF930SL-2","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43405060505690,"sku":"BWCS-ZTF930SL-3","price":29.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-ZTF930SL-1.webp?v=1779369898","url":"https:\/\/batteryweb.com\/products\/orange-rio-ii-replacement-battery-37v-900mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}