{"product_id":"emporia-telme-c140-replacement-battery-37v-900mah-li-ion","title":"AK-C140 Emporia Telme C140 Replacement Battery 3.7V 900mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eEmporia Telme C140 — 3.7V Li-ion Replacement Battery (AK-C140)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V 900mAh Li-ion battery for the Emporia Telme C140 senior mobile phone. It replaces the original AK-C140 cell when the existing battery no longer holds enough charge for daily calls and use. Dimensions are 53.00 x 34.00 x 4.30mm — confirm these against your existing cell before installing.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eTelme C140 fitment:\u003c\/strong\u003e\n    The C140 uses a compact 3.7V single-cell pack with a low-current BMS matched to the phone's basic processor and call radio. This replacement cell matches that voltage rail and connector spec exactly.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through full charge and discharge on the Telme C140 platform. The BMS accepted the cell without fault flags, and the charge IC completed a full cycle without thermal interruption.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    On first use after installation, run one full discharge-charge cycle without interruption. This lets the fuel gauge IC map its reference curve against the new cell before the phone starts reporting percentage to the display.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Telme C140 reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe C140's fuel gauge IC stores a discharge curve calibrated to the original cell. When you fit a new cell, that stored curve no longer matches the actual cell chemistry, so the reported percentage drifts from real charge state. This shows up most visibly in the top third and bottom third of the gauge — both ends compress or stretch. One complete discharge to auto-off followed by a full uninterrupted charge resets the reference points. After that cycle, percentage readout tracks accurately against 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 happens when the fuel gauge IC is still calibrated to the old cell's voltage curve. The phone's power management reads 25% remaining but the actual cell voltage has already dropped to the cutoff threshold under call-radio load. The radio draws a short current spike during transmission that the weakened or miscalibrated cell cannot sustain, and the phone shuts off to protect the circuit. Run one full discharge-charge cycle and confirm the cell rests at 4.18–4.20V at full charge before normal use resumes.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43405015351386,"sku":"BWCS-DEP510SL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43405015384154,"sku":"BWCS-DEP510SL-2","price":27.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43405015416922,"sku":"BWCS-DEP510SL-3","price":29.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-DEP510SL_1.webp?v=1779369805","url":"https:\/\/batteryweb.com\/products\/emporia-telme-c140-replacement-battery-37v-900mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}