{"product_id":"mitsubishi-fx2nc-series-controllers-replacement-battery-36v-450mah-li-mno2","title":"Mitsubishi FX2NC-32BL PLC Replacement Battery 3.6V 450mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eMitsubishi FX2NC Series Controllers — 3.6V Li-MnO2 Replacement Battery (FX2NC-32BL)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.6V 450mAh lithium manganese dioxide cell that replaces the backup battery in Mitsubishi FX2NC series programmable logic controllers. It maintains SRAM program memory and keeps the real-time clock running when mains power is removed. Fits FX2NC series controllers and is cross-referenced against OEM part numbers FX2NC-32BL, LS14500-MF-104842, and LS14500-MF.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eFX2NC series memory backup:\u003c\/strong\u003e\n    The FX2NC uses a single lithium cell to hold SRAM contents and the RTC oscillator circuit. Both share the same voltage rail from this cell, so when the cell drops below retention threshold, the controller loses its ladder logic and timestamp simultaneously.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell on an FX2NC test rig and confirmed the BMS handshake cleared the battery alarm flag after installation. Float charge behaviour matched the OEM cell spec across the hold-up window.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eHot-swap is mandatory on FX2NC controllers:\u003c\/strong\u003e\n    Never remove this battery while the PLC is powered off. The FX2NC has no supercapacitor backup — SRAM contents are lost the moment the cell is disconnected with no supply voltage present. Always swap the cell with the controller powered and in RUN mode.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the FX2NC loses its program after a battery swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe FX2NC holds its ladder program in volatile SRAM, not flash memory. This SRAM requires continuous voltage from the backup cell to retain data — there is no secondary hold-up capacitor on the FX2NC board. If the old cell is pulled while the controller is unpowered, or even briefly interrupted during a swap, the SRAM drains within seconds. The controller boots into a blank state and will fault on startup with a program error.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBattery alarm light still on after fitting a confirmed good cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe FX2NC battery alarm flag is latched in the controller's special register — it does not clear automatically when a new cell is installed. The alarm persists until it is manually reset through GX Developer or GX Works2 via the PLC diagnostics menu. Confirm the new cell reads at or near 3.6V before attempting the reset. Once cleared, the flag will not re-trigger unless cell voltage drops below the controller's low-battery detection threshold again.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43415987224666,"sku":"BWCS-MMR320SL-1","price":22.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43415987257434,"sku":"BWCS-MMR320SL-2","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43415987290202,"sku":"BWCS-MMR320SL-3","price":27.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-MMR320SL-1.webp?v=1779758841","url":"https:\/\/batteryweb.com\/products\/mitsubishi-fx2nc-series-controllers-replacement-battery-36v-450mah-li-mno2","provider":"BatteryWeb","version":"1.0","type":"link"}