{"product_id":"emporia-ak-v28-replacement-battery-37v-1200mah-li-ion","title":"Emporia AK-V28 Replacement Battery 3.7V 1200mAh Li-ion","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eEmporia AK-V28 \/ AK-V29 — 3.7V Li-ion Replacement Battery (AK-V28-BC)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 1200mAh Li-ion battery for the Emporia AK-V28, AK-V29, Talk Plus, and Talk Premium handsets. It replaces OEM part numbers AK-V28-BC and AK-V29-BC. Swap it in when the original cell no longer holds charge or the phone shuts down before reaching zero percent.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eAK-V28 and AK-V29 platform fit:\u003c\/strong\u003e\n    Both handsets share the same PCB layout, connector pinout, and BMS handshake protocol — one cell covers all listed models 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 full charge and discharge on the AK-V28 chassis. The BMS accepted the charge profile without triggering overcurrent cutoff, and voltage held within spec at the 3.7V nominal rail throughout.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration after install:\u003c\/strong\u003e\n    On first use, let the phone discharge to auto-shutdown, then charge uninterrupted to 100% before use. This gives the fuel gauge IC one complete reference cycle against the new cell's actual discharge curve — skip it and the percentage readout will drift.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSudden shutdown at 20–30% on the Emporia AK-V28\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe AK-V28 fuel gauge IC stores a discharge curve calibrated to the original cell. A new cell has a slightly different voltage-to-capacity slope, so the IC miscalculates remaining charge. When the modem fires during a call or the screen backlight peaks, current draw spikes and actual cell voltage drops below the BMS cutoff threshold — even though the display showed 25%. One full discharge-charge cycle after installation resets the coulomb counter and corrects this behaviour.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003ePhone won't power on after the battery sat in storage\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-ion cells self-discharge during storage. If the cell drops below approximately 2.5V, the BMS enters a lockout state to prevent further discharge damage. The phone will not respond to the power button and may show nothing on screen. Connect the phone to a wall charger — not a PC USB port — and leave it for 15–20 minutes without pressing anything. The charge IC will trickle current into the cell until voltage climbs above the BMS re-enable threshold, typically around 2.9V, at which point normal charging resumes.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43405109952602,"sku":"BWCS-EAK280SL-1","price":22.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43405109985370,"sku":"BWCS-EAK280SL-2","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43405110018138,"sku":"BWCS-EAK280SL-3","price":27.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-EAK280SL-1.webp?v=1779369992","url":"https:\/\/batteryweb.com\/products\/emporia-ak-v28-replacement-battery-37v-1200mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}