{"product_id":"greatcall-jitterbug-smart-2-replacement-battery-385v-3000mah-li-polymer","title":"GreatCall Jitterbug Smart 2 Replacement Battery 3.85V 3000mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eGreatCall Jitterbug Smart 2 \/ OT5049S — 3.85V Li-Polymer Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.85V, 3000mAh Li-Polymer cell replaces the original battery in the GreatCall Jitterbug Smart 2, OT5049S, and Smart A30. It restores full power to the phone's calling, messaging, and basic smartphone functions. Capacity is rated at 11.55Wh and matches OEM specifications directly.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eJitterbug Smart 2 \/ OT5049S \/ Smart A30 compatibility:\u003c\/strong\u003e\n    These three models share the same physical cell footprint at 76.90 x 62.26 x 3.40mm, the same 3.85V nominal voltage rail, and the same charge IC interface — which is why one cell covers all three 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 through charge and discharge on the Jitterbug Smart 2 platform. The BMS accepted the cell without fault flags, and the charge IC negotiated correctly through a full cycle to termination.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle fuel gauge recalibration:\u003c\/strong\u003e\n    After installation, disable fast charging for the first complete discharge-charge cycle. The fuel gauge IC is calibrated to the old cell's discharge curve. Running one full cycle at standard charge current lets the coulomb counter reset its reference before fast charge pushes higher current into 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\"\u003eWhy the Jitterbug Smart 2 reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe phone's fuel gauge IC builds its percentage estimates from a stored discharge curve tied to the old cell's internal resistance profile. A new cell has a different impedance, so the IC maps voltage readings onto the wrong curve. This shows up as percentage jumps, slow drain from 100% followed by a sudden drop, or the phone dying while showing 15–20% remaining. One complete discharge to auto-shutdown followed by a full charge to 100% forces the coulomb counter to re-anchor its reference points to the new cell.\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 is a voltage cliff failure, not a capacity issue. Under load from the cellular modem or a bright screen, the cell voltage drops sharply below the BMS cutoff threshold — even though the fuel gauge still reads 20–30%. It happens because the fuel gauge IC hasn't yet mapped the new cell's voltage-sag behaviour under load. Run two full discharge-charge cycles without fast charging to let the IC learn the cell's actual voltage floor. After calibration, the shutdown threshold should track accurately down to around 3.0–3.2V under load.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43392052265050,"sku":"BWCS-OTP504XL-1","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43392052297818,"sku":"BWCS-OTP504XL-2","price":29.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43392052330586,"sku":"BWCS-OTP504XL-3","price":32.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-OTP504XL-1.webp?v=1779143526","url":"https:\/\/batteryweb.com\/products\/greatcall-jitterbug-smart-2-replacement-battery-385v-3000mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}