{"product_id":"panasonic-replacement-battery-6v-2900mah-li-mno2","title":"Panasonic BR-2\/3AGCT4A PLC Replacement Battery 6V 2900mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003ePanasonic BR-2\/3AGCT4A — 6V Li-MnO2 Replacement Battery (A98L-0031-0025)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis Panasonic BR-2\/3AGCT4A is a 6V 2900mAh lithium manganese dioxide cell used as a backup or main power source in PLC systems. It retains SRAM program memory and real-time clock data during mains power interruptions. Fits controllers cross-referencing OEM part numbers BR-2\/3AGCT4A, A98L-0031-0025, and BR2\/3AGCT4A.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eIndustrial PLC compatibility:\u003c\/strong\u003e\n    Controllers that list A98L-0031-0025 or BR-2\/3AGCT4A share the same voltage rail and connector footprint. The 6V Li-MnO2 chemistry holds a stable discharge curve across the wide temperature swings common inside control panel enclosures, which keeps SRAM retention solid between maintenance cycles.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We confirmed cell voltage at rest, then monitored the float charge uptake on a live PLC rack. The BMS accepted the cell immediately with no handshake fault or alarm flag triggered during insertion.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eHot-swap requirement:\u003c\/strong\u003e\n    Always replace this cell with the PLC powered on and in RUN mode. Removing the battery while the controller is powered off drains SRAM instantly — program data and RTC values are gone. If the PLC was off during the swap, a full program reload from your programming device is required before restarting.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003ePLC losing program memory after battery swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-MnO2 cells have no internal buffer — the moment they are disconnected, SRAM loses its hold voltage. On most controllers, SRAM retention requires at least 2.5V continuous supply. Any gap in supply during a cold swap drops the rail below that threshold within seconds. The only recovery path is reloading the program from a backup file on the programming terminal.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBattery alarm not clearing after a confirmed good installation\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eA new cell installed correctly will not automatically reset the battery alarm on most PLCs. The controller latches the fault flag in software and holds it until manually cleared. Open your programming software, navigate to the diagnostics or status buffer, and acknowledge the battery alarm from there. After clearing, confirm the cell reads above 5.8V in the status register before closing the panel.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43415986896986,"sku":"BWCS-FN500SL-1","price":27.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43415986929754,"sku":"BWCS-FN500SL-2","price":31.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43415986962522,"sku":"BWCS-FN500SL-3","price":34.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-FN500SL-1.webp?v=1779758841","url":"https:\/\/batteryweb.com\/products\/panasonic-replacement-battery-6v-2900mah-li-mno2","provider":"BatteryWeb","version":"1.0","type":"link"}