{"product_id":"ceyear-4992a-handheld-radio-test-replacement-battery-111v-7800mah-li-ion","title":"Ceyear 4992A Handheld Radio Test Replacement Battery 11.1V 7800mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eCeyear 4992A Handheld Radio Test — 11.1V Li-ion Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 11.1V 7800mAh Li-ion battery fits the Ceyear 4992A Handheld Radio Test instrument. The 4992A is a portable RF signal analyser used in telecommunications and medical device manufacturing environments. It runs from battery power during field measurements and quality control procedures where wall power is unavailable.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003e4992A platform fit:\u003c\/strong\u003e\n    The 4992A draws sustained current during active RF signal analysis. This battery matches the voltage rail and connector configuration the instrument expects. The BMS communicates state-of-charge data back to the device's power management circuit, so the charge indicator and low-battery thresholds function correctly after installation.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through charge and discharge cycles on the bench. The BMS handled charge termination cleanly and passed state-of-charge reporting to the host device without fault flags. Capacity measured within specification across all test cycles.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-installation self-test cycle:\u003c\/strong\u003e\n    After fitting this battery, allow the 4992A to complete its full power-on self-test without interruption. The instrument runs a BMS verification routine at startup. Cutting power during this sequence triggers a false battery fault that persists until the next full reboot.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the 4992A alarms low battery with a fully charged replacement installed\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe 4992A's battery management circuit compares cell voltage and capacity data against a calibration baseline set for the original OEM cell. A new replacement cell has not yet completed a full charge-discharge learn cycle, so the reported state-of-charge can read lower than actual. This causes the instrument to trigger a low-battery alarm even when the pack is fully charged. Running one complete charge-discharge cycle allows the BMS to recalibrate its capacity estimate and clears the erroneous alarm.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003e4992A will not power on after the battery has been in storage\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-ion cells self-discharge during storage. If the cell voltage drops below approximately 2.5V per cell — around 7.5V at pack level — the BMS enters a protection lockout and blocks output to prevent damage to deeply discharged cells. The instrument sees no voltage on the power rail and will not boot. Connect the battery to a compatible charger for at least 30 minutes before attempting to power on the 4992A; the charger's pre-charge stage recovers the cell voltage above the BMS re-enable threshold before full charge current begins.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43381497462874,"sku":"BWCS-HVA710MD-1","price":208.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43381497495642,"sku":"BWCS-HVA710MD-2","price":248.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43381497528410,"sku":"BWCS-HVA710MD-3","price":277.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-HVA710MD-1.webp?v=1778901266","url":"https:\/\/batteryweb.com\/products\/ceyear-4992a-handheld-radio-test-replacement-battery-111v-7800mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}