{"product_id":"symbol-mc9090-replacement-battery-36v-20mah-ni-mh","title":"Symbol MC9090 3.6V 20mAh Ni-MH CMOS Backup Battery 3\/V15H","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSymbol MC9090 Series — 3.6V Ni-MH CMOS Backup Battery (3\/V15H)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.6V, 20mAh Ni-MH CMOS backup battery for the Symbol MC9090 family of rugged mobile computers, including the MC9090-G, MC9090-K, and MC9090-S variants. It powers the real-time clock and SRAM when the main battery is removed or fully drained. Without it, the device loses its clock, network credentials, and scanner configuration every time main power is interrupted.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMC9090 series compatibility:\u003c\/strong\u003e\n    The MC9090-G, -K, and -S variants all share the same RTC circuit and CMOS backup architecture, drawing from the same voltage rail and using the same connector footprint. One part covers the entire platform.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through a full main-power removal cycle on an MC9090-G unit. The BMS held clock and SRAM retention without reset, and voltage stayed above the 2.8V minimum retention threshold throughout the test window.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eRTC reset after swap:\u003c\/strong\u003e\n    The CMOS cell powers the RTC circuit directly. Any interruption during replacement — even a few seconds — resets the clock to its default value. After installing this cell, go into the MC9090 device settings and manually set the correct date and time before returning the unit to service.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eClock resetting to a default date after every main battery swap on the MC9090\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe MC9090 RTC circuit runs off the CMOS backup cell continuously. When that cell drops below approximately 2.8V, it can no longer sustain the RTC register values during main power removal. The clock resets to the factory default date each time. A depleted cell measures below 3.0V at rest and will not recover — it must be replaced. This cell ships at full rated voltage and restores RTC retention immediately on installation.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eMC9090 losing Wi-Fi profiles and scanner settings every time the main battery is pulled\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe MC9090 stores network credentials and scanner configuration in SRAM, which is backed by the CMOS cell — not flash memory. Once the backup cell is depleted, all SRAM contents are lost the moment main power is removed. This is different from a clock reset: the device boots clean with no profiles, no paired devices, and no scanner parameters. Replacing the CMOS cell stops the data loss; reconfigure the device once after the swap and the settings will persist through future battery changes.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43339826888794,"sku":"BWCS-ICN200BU-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43339826921562,"sku":"BWCS-ICN200BU-2","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43339826954330,"sku":"BWCS-ICN200BU-3","price":28.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-ICN200BU-1.webp?v=1778366788","url":"https:\/\/batteryweb.com\/products\/symbol-mc9090-replacement-battery-36v-20mah-ni-mh","provider":"BatteryWeb","version":"1.0","type":"link"}