{"product_id":"greatcall-jitterbug-plus-replacement-battery-37v-800mah-li-ion","title":"GreatCall Jitterbug Plus Replacement Battery 3.7V 800mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eGreatCall Jitterbug Plus — 3.7V Li-ion Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V, 800mAh lithium-ion cell replaces the original battery in the GreatCall Jitterbug Plus mobile phone. It fits the simplified senior-focused handset and restores power to devices where the original cell no longer holds charge. Dimensions are 49.50 x 33.80 x 4.70mm — verify against your existing cell before installation.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eJitterbug Plus fit:\u003c\/strong\u003e\n    The Jitterbug Plus runs a low-complexity interface but the display backlight and emergency call feature draw steady current from a single cell. This replacement matches the original 3.7V rail and connector orientation so the phone's charge IC recognises the new cell 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 a full discharge and charge sequence on the Jitterbug Plus platform. The BMS accepted the cell on the first connection, charge current ramped normally through CC\/CV stages, and the phone reached full charge without thermal events.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration after swap:\u003c\/strong\u003e\n    After fitting this cell, run one complete discharge down to auto-shutoff, then charge uninterrupted to 100% before normal use. The Jitterbug Plus fuel gauge IC calibrates its coulomb counter against a full discharge curve — skipping this step causes the percentage readout to drift against the new cell's actual capacity.\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 Plus reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe fuel gauge IC stores a discharge curve from the original cell. When a new cell goes in, the IC is still mapping voltage to percentage against that old curve. The two curves rarely match exactly, so the displayed percentage drifts — sometimes reading 50% when the cell is near cutoff voltage. One full discharge-charge cycle forces the IC to relearn the curve against the new cell. After that cycle, percentage readouts stabilise at the correct values.\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 load from the screen or emergency-call radio module — a voltage cliff the fuel gauge did not predict. The phone hits the low-voltage cutoff and shuts down even though the percentage display showed charge remaining. The fix is completing the recalibration cycle first: drain the phone to auto-shutoff, then charge fully to 100%. After recalibration, the fuel gauge tracks the actual discharge curve and triggers the warning at the correct remaining voltage rather than cutting out at 3.4V without notice.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43409451843674,"sku":"BWCS-SMU420SL-1","price":21.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43409451876442,"sku":"BWCS-SMU420SL-2","price":24.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43409451909210,"sku":"BWCS-SMU420SL-3","price":26.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-SMU420SL-1.webp?v=1779579736","url":"https:\/\/batteryweb.com\/products\/greatcall-jitterbug-plus-replacement-battery-37v-800mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}