{"product_id":"mitsubishi-mr-bat6v1set-a-replacement-battery-6v-1350mah-li-mno2","title":"Mitsubishi MR-BAT6V1SET-A PLC Replacement Battery 6V 1350mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eMitsubishi MR-BAT6V1SET-A \/ MR-J4 WK17 — 6V Li-MnO2 Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 6V 1350mAh lithium manganese dioxide cell for Mitsubishi MR-BAT6V1SET-A and MR-J4 WK17 series PLCs. It holds backup power for the controller's SRAM and real-time clock when mains power drops. Voltage and footprint match the factory spec at 36.00 × 34.00 × 17.30mm.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMR-BAT6V1SET-A and MR-J4 WK17 fit:\u003c\/strong\u003e\n    Both units run the same 6V backup rail with identical connector keying and BMS handshake thresholds, so a single cell covers both platforms without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We confirmed the cell triggers the PLC's battery-OK status correctly and holds the SRAM retention voltage above the 3.0V cutoff that initiates a memory-loss fault on these controllers.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eHot-swap procedure on MR-series controllers:\u003c\/strong\u003e\n    Always replace this cell with the PLC powered on and in RUN mode. Removing the battery while the controller is off drops SRAM voltage immediately — the program is erased and a full reload from the programming device is required before the machine can restart.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003ePLC battery alarm not clearing after a confirmed good installation\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eOn Mitsubishi MR-series controllers, the battery alarm flag is latched in software — fitting a new cell does not automatically clear it. The alarm must be manually reset through the GX Works or MR Configurator programming interface after the swap. If the flag stays active after a reset, check that the cell voltage has recovered above 5.8V, which can take a few hours on the PLC's float charge. A persistent alarm below that voltage points to a connector seating issue, not a failed cell.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eClock showing wrong date and time after battery replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe real-time clock loses its reference the moment SRAM voltage drops — even briefly — during a cold swap. When the PLC comes back online, the RTC defaults to a factory timestamp rather than the actual time. Connect to the controller via GX Works and write the correct date and time to the RTC registers before returning the machine to production. On any time-stamped data logging application, verify the first few log entries after the swap before treating them as accurate.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43415972380762,"sku":"BWCS-MBT610SL-1","price":33.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43415972413530,"sku":"BWCS-MBT610SL-2","price":39.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43415972446298,"sku":"BWCS-MBT610SL-3","price":43.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-MBT610SL-1.webp?v=1779758774","url":"https:\/\/batteryweb.com\/products\/mitsubishi-mr-bat6v1set-a-replacement-battery-6v-1350mah-li-mno2","provider":"BatteryWeb","version":"1.0","type":"link"}