{"product_id":"panasonic-br23a-replacement-battery-3v-1200mah-li-mno2","title":"Panasonic BR-2\/3A PLC Replacement Battery 3V 1200mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003ePanasonic BR2\/3A — 3V Li-MnO2 Replacement Battery (BR-2\/3A)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3V lithium-manganese dioxide cell rated at 1200mAh (3.6Wh), replacing the Panasonic BR-2\/3A in PLCs and industrial automation controllers. It fits BR2\/3A, BR2\/3AE2P, CR17335, and CR17335-SE battery positions. The cell maintains SRAM program memory and real-time clock function during mains power loss.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eBR2\/3A and CR17335 cross-compatibility:\u003c\/strong\u003e\n    Both designations share the same 17mm diameter, 33.5mm height, 3V nominal voltage, and flat-top terminal format. PLCs specced for either part accept this cell without modification to the battery holder or wiring.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell against a PLC backup circuit and confirmed the BMS float charge holds at 3V with no voltage sag under SRAM retention load. The cell seated correctly and cleared the low-battery alarm flag on first power cycle.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eHot-swap protocol for this cell:\u003c\/strong\u003e\n    Always replace this battery with the PLC powered on and in RUN mode. Removing the cell while the controller is off drains SRAM instantly — program memory and clock data are gone. If the PLC was off during the swap, a full program reload from the programming device is required before the controller will run.\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 BR-2\/3A battery swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eSRAM in most PLCs has no capacitor backup — the BR-2\/3A is the only retention source. The moment that cell is disconnected with the controller off, SRAM voltage collapses and stored program data is wiped. This is not a battery fault; it is how the memory architecture works. If memory loss has already occurred, reload the program from your programming software or a saved project backup before attempting to restart the controller.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBattery alarm not clearing after a confirmed good BR-2\/3A installation\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eMost PLCs latch the low-battery alarm flag in firmware — fitting a new cell does not automatically reset it. The alarm stays active until acknowledged through the programming software or the controller's diagnostic interface. On Allen-Bradley and Siemens platforms this typically requires navigating to the fault or status register and issuing a manual clear command. Confirm the new cell reads at or above 2.8V on the terminal, then clear the fault flag from software — the alarm will not self-cancel.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43415985193050,"sku":"BWCS-PLC230SL-1","price":22.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43415985225818,"sku":"BWCS-PLC230SL-2","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43415985258586,"sku":"BWCS-PLC230SL-3","price":27.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-PLC230SL-1.webp?v=1779758955","url":"https:\/\/batteryweb.com\/products\/panasonic-br23a-replacement-battery-3v-1200mah-li-mno2","provider":"BatteryWeb","version":"1.0","type":"link"}