{"product_id":"olympia-vox-color-replacement-battery-37v-900mah-li-ion","title":"Olympia Vox Color Replacement Battery 3.7V 900mAh 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 3.7V, 900mAh (3.33Wh) lithium-ion cell is a direct replacement for the Olympia Vox Color and Vox Color 2159 handsets. Both models share the same battery bay dimensions (53.00 × 34.00 × 4.80mm) and the same charge management circuit, so one cell covers both. Fit the cell, close the cover, and the phone powers on normally.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eVox Color and Vox Color 2159 compatibility:\u003c\/strong\u003e\n    Both handsets draw from the same 3.7V nominal rail and use an identical connector pinout and bay geometry. No adapter or modification is needed — the cell seats flush and the contacts align correctly on both variants.\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 a controlled rig. The BMS held the charge cutoff at 4.2V and triggered low-voltage protection cleanly at the rated floor — no false cutoffs, no thermal events during the charge phase.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first cycle:\u003c\/strong\u003e\n    On first use after fitting, run the battery from 100% down to automatic shutdown without plugging in mid-way. This lets the fuel gauge IC map the new cell's actual discharge curve before it starts reporting percentage to the OS — skipping this step causes erratic percentage readings for the first several days of use.\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 wrong battery percentage after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe fuel gauge IC inside the phone was calibrated against the discharge curve of the original cell. When a new cell goes in, that learned curve no longer matches the actual voltage-to-capacity relationship of the replacement. The IC reads a voltage point and maps it to a percentage based on old data — so it can report 40% when the cell is actually at 25%. One full discharge cycle from 100% to automatic shutdown, followed by a full charge to 4.2V without interruption, forces the coulomb counter to reset its baseline against the new cell.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSudden shutdown at 20–30% on the Vox Color after battery replacement\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThis is a voltage-cliff failure, not a capacity problem. When the modem transmits or the screen brightness peaks, instantaneous current draw spikes sharply. If the cell's internal resistance is even slightly elevated — common in a new cell that has not yet been through a full cycle — terminal voltage drops below the BMS cutoff threshold for a fraction of a second, and the phone shuts off despite the gauge showing charge remaining. Run one complete discharge-charge cycle first. If shutdowns continue past three full cycles, check that the cell contacts are fully seated — a partial connection raises effective resistance and worsens the voltage sag under load.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43405023641690,"sku":"BWCS-NK4CHL-1","price":22.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43405023674458,"sku":"BWCS-NK4CHL-2","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43405023707226,"sku":"BWCS-NK4CHL-3","price":27.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-NK4CHL-1.webp?v=1779369842","url":"https:\/\/batteryweb.com\/products\/olympia-vox-color-replacement-battery-37v-900mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}