{"product_id":"olympia-vox-color-replacement-battery-37v-750mah-li-ion","title":"Olympia Vox Color Compatible Battery 3.7V 750mAh Li-ion","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eOlympia Vox Color \/ Vox Color 2159 — 3.7V Li-ion Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V 750mAh Li-ion cell for the Olympia Vox Color and Vox Color 2159 compact smartphones. It fits the original battery bay directly, using the same footprint at 53.00 × 34.00 × 4.80mm. Swap it in when the original cell can no longer hold a usable charge.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eVox Color and Vox Color 2159 fit:\u003c\/strong\u003e\n    Both models share the same battery bay dimensions and 3.7V single-cell architecture, so one cell covers the full pair. The connector and PCB protection circuit are matched to the charge IC on both boards.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled the cell through charge and discharge on a calibrated rig, confirmed BMS cutoff triggers correctly at the low-voltage threshold, and verified no thermal event during the first charge cycle on a high-impedance new cell.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    After installing this cell, disable fast charging if your charger supports it, then run one full discharge down to automatic power-off before recharging to 100%. This gives the phone's fuel gauge IC a clean discharge curve to reference, so percentage readings stay accurate from the second cycle onward.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Vox Color reports the wrong battery percentage after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe fuel gauge IC in the Vox Color stores a discharge curve learned from the original cell. When a new cell goes in, that stored curve no longer matches the actual voltage-to-capacity relationship of the replacement. The phone reads voltage, maps it to the old curve, and outputs a percentage that can be off by 15–25 points. One full discharge-charge cycle rewrites the reference curve to match the new cell's actual behaviour, after which the gauge settles to accurate readings.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSudden shutdown at 20–30% on the new cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eA fresh Li-ion cell has slightly higher internal impedance than a broken-in one. When the modem fires a data burst or the screen peaks brightness, the load pulls enough current to cause a momentary voltage sag below the BMS cutoff threshold — even though the displayed percentage looks safe. The phone interprets this voltage dip as a dead cell and shuts down. After three to five full charge cycles the cell's impedance drops, the sag narrows, and cutoffs at 20–30% stop occurring. If shutdowns continue past five cycles, check that the cell rests at 3.7V open-circuit after a full charge.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43409494048858,"sku":"BWCS-NK4CXL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43409494081626,"sku":"BWCS-NK4CXL-2","price":27.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43409494114394,"sku":"BWCS-NK4CXL-3","price":29.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-NK4CXL-1.webp?v=1778213576","url":"https:\/\/batteryweb.com\/products\/olympia-vox-color-replacement-battery-37v-750mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}