{"product_id":"modicon-884-replacement-battery-3v-1350mah-li-mno2","title":"Modicon 884 PLC Replacement Battery 3V 1350mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eModicon 884 \/ 984X Series — 3V Li-MnO2 Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3V lithium-manganese dioxide cell delivers 1350mAh of backup power to the Modicon 884, 984X, 984X-008, and ASC11\/BASIC PLC platforms. Its sole job is to hold SRAM program memory and the real-time clock when primary power drops. Lose this cell and the controller loses everything stored in volatile memory.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003e884 and 984X platform compatibility:\u003c\/strong\u003e\n    These controllers share the same memory-backup voltage rail and cell footprint — 3V Li-MnO2 at 36.00 × 18.80 × 17.10mm. The backup circuit draws directly from this cell during power loss with no BMS handshake required.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell under a simulated SRAM retention load matching the 884's standby current draw. Voltage held above the 2.5V SRAM retention threshold throughout the discharge curve with no premature cutoff.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eHot-swap protocol for the 884:\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 clears SRAM instantly — the program is gone and must be reloaded from your programming device.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Modicon 884 loses its program after a battery swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe 884 uses static RAM for program and configuration storage. SRAM needs continuous voltage — typically above 2.5V — to retain data. The moment the backup cell is disconnected and the controller has no primary power path to memory, the contents are erased in milliseconds. Hot-swapping with the PLC powered on keeps the SRAM supply live through the primary power rail, so the cell can be changed without data loss. If the swap was done cold, a full program reload via your programming terminal is the only recovery path.\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\"\u003eOn Modicon 984X-series controllers, the battery fault flag is a latched status bit — it does not clear automatically when a new cell is fitted. The alarm persists until it is manually reset through the programming software. Open your Modicon programming environment, navigate to the system status or diagnostic word, and clear the battery fault bit. After reset, confirm the status word shows no active battery fault before closing the session.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43415974707290,"sku":"BWCS-GU884SL-1","price":21.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43415974740058,"sku":"BWCS-GU884SL-2","price":24.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43415974772826,"sku":"BWCS-GU884SL-3","price":26.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-GU884SL-1.webp?v=1779758774","url":"https:\/\/batteryweb.com\/products\/modicon-884-replacement-battery-3v-1350mah-li-mno2","provider":"BatteryWeb","version":"1.0","type":"link"}