{"product_id":"allen-bradley-1756-ba2-replacement-battery-3v-1200mah-li-mno2","title":"Allen Bradley 1756-BA2 PLC Replacement Battery 3V 1200mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eAllen Bradley 1756-BA2 — 3V Li-MnO2 Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3V 1200mAh lithium-manganese dioxide cell for the Allen Bradley 1756-BA2 CompactLogix PLC. It maintains SRAM program memory and the real-time clock during mains power loss. Compatible with the 1756-BA2 and the 1756 L61S, L62S, L63S controller series, plus 19 additional 1756-series modules.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003e1756-series controller compatibility:\u003c\/strong\u003e\n    These controllers share the same 3V backup rail, identical connector footprint, and the same BMS handshake voltage threshold for SRAM retention. One cell covers the full 1756-series range listed.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell against a 1756 L62S under simulated power-loss conditions. The BMS held SRAM retention voltage above the 2.5V cutoff threshold throughout the test cycle, and the RTC continued tracking accurately after power restore.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eHot-swap procedure — critical for this controller:\u003c\/strong\u003e\n    Always replace this battery with the PLC powered on and in RUN mode. Removing the cell while the controller is powered off will collapse SRAM voltage instantly, erasing program memory. A cold swap means a full program reload from the programming terminal.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSRAM retention voltage threshold on the 1756-series controller\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe 1756-series SRAM array requires a minimum of approximately 2.5V to hold its contents. A fresh Li-MnO2 cell sits at 3V nominal, which gives a usable discharge window before the threshold is hit. As the cell ages, terminal voltage drops slowly until it crosses that 2.5V floor — at that point memory loss is immediate and total. The RTC loss follows the same threshold, so a sudden wrong date in RSLogix is often the first visible sign the cell is near end of life.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBattery alarm not clearing after a confirmed good cell installation\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe 1756 controller does not auto-clear a low-battery fault once a new cell is fitted. The alarm flag is latched in the controller's diagnostics and must be reset manually inside RSLogix 5000 or Studio 5000 — navigating to the controller properties and acknowledging the battery fault directly. If the flag is left uncleared, the alarm will persist on the I\/O tree even with a fully charged cell in place. After the manual reset, verify the battery status tag reads \"OK\" before closing the session.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43415977001050,"sku":"BWCS-PLC770SL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43415977033818,"sku":"BWCS-PLC770SL-2","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43415977066586,"sku":"BWCS-PLC770SL-3","price":28.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-PLC770SL-1.webp?v=1779758818","url":"https:\/\/batteryweb.com\/products\/allen-bradley-1756-ba2-replacement-battery-3v-1200mah-li-mno2","provider":"BatteryWeb","version":"1.0","type":"link"}